PHP MYSQL Dominicana

domingo, 12 de enero de 2025

mult array

$arr=[14,"id"=>134,[90,44,"name"=>["short"=>"Ambiorix","lastname"=>"Rodriguez"]]];

viernes, 10 de enero de 2025

File functions grouped

1. File and Directory Manipulation

These functions are used to create, delete, move, or rename files and directories.

fopen() — Opens a file or URL.
fclose() — Closes an open file.
rename() — Renames or moves a file or directory.
unlink() — Deletes a file.
rmdir() — Removes an empty directory.
mkdir() — Creates a new directory.
opendir() — Opens a directory.
readdir() — Reads an entry from an open directory.
closedir() — Closes an open directory.
mkdir() — Creates a new directory.
file_put_contents() — Writes data to a file (replaces the file if it already exists).
file_get_contents() — Reads a file into a string.

2. File and Directory Permissions

These functions are used for managing file and directory permissions (read/write/execute).

chmod() — Changes the permissions of a file or directory.
chown() — Changes the owner of a file or directory.
chgrp() — Changes the group of a file or directory.
fileperms() — Returns the permissions of a file.
umask() — Sets the default file creation mask.

3. File and Directory Properties

These functions are used to retrieve information about files and directories.

file_exists() — Checks if a file or directory exists.
is_file() — Checks if a given path is a regular file.
is_dir() — Checks if a given path is a directory.
is_readable() — Checks if a file or directory is readable.
is_writable() — Checks if a file or directory is writable.
is_executable() — Checks if a file or directory is executable.
filemtime() — Returns the last modified time of a file.
fileatime() — Returns the last access time of a file.
filectime() — Returns the inode change time of a file.
filesize() — Returns the size of a file.
filetype() — Returns the type of a file (e.g., regular file, directory).
stat() — Returns an array with file status information.
fstat() — Returns the status of an open file.
dirname() — Returns the directory name of a file path.
basename() — Returns the filename from a file path.
pathinfo() — Returns information about a file path.

4. File Reading and Writing

These functions are used to read from and write to files.

fread() — Reads a file.
fwrite() — Writes to a file.
fgets() — Reads a line from a file.
fgetcsv() — Reads a CSV line from a file.
file() — Reads a file into an array.
file_get_contents() — Reads the entire content of a file into a string.
file_put_contents() — Writes data to a file.
readfile() — Reads a file and sends it directly to the output.
fprintf() — Writes formatted data to a file.

5. File Uploads

These functions are used for handling file uploads.

move_uploaded_file() — Moves an uploaded file to a new location.
is_uploaded_file() — Checks if a file was uploaded via HTTP POST.
$_FILES — An array containing file upload information (used in conjunction with form file uploads).

6. Directory Traversal

These functions are used to traverse directories, list files, and iterate over directory contents.

opendir() — Opens a directory for reading.
readdir() — Reads the next entry in an open directory.
rewinddir() — Resets the directory pointer to the beginning of a directory.
closedir() — Closes an open directory.
scandir() — Returns a list of files and directories in a directory.
glob() — Finds pathnames matching a pattern (e.g., *.txt).
dir() — Creates a Directory object for traversing directories (object-oriented approach).

7. File Locking

These functions are used for locking files to prevent other processes from modifying them.

flock() — Acquires or releases a file lock.
lockf() — Locks or unlocks a file (using file descriptor).
fnctl() — Performs control operations on a file descriptor (Unix-based).

8. Temporary Files and Directories

These functions are used to create temporary files and directories.

tempnam() — Creates a temporary file with a unique name.
tmpfile() — Creates a temporary file and returns a file handle.
sys_get_temp_dir() — Returns the system's temporary directory path.

9. File and Directory Traversal (Recursion)

These functions are used for recursively traversing directories and working with nested structures.

RecursiveDirectoryIterator — Iterates over directories and subdirectories.
RecursiveIteratorIterator — Provides a recursive iterator for iterating through nested directories.
DirectoryIterator — Iterates over files and directories in a directory.

10. Compression and Archiving

These functions help with creating or extracting compressed files and archives.

gzopen() — Opens a gzipped file for reading or writing.
gzread() — Reads from a gzipped file.
gzwrite() — Writes to a gzipped file.
gzclose() — Closes a gzipped file.
zip_open() — Opens a ZIP archive.
zip_read() — Reads a file from a ZIP archive.
zip_close() — Closes a ZIP archive.
tar() — Creates a TAR archive.

11. Miscellaneous Functions

Other miscellaneous filesystem-related functions:

disk_free_space() — Returns the free space available on a disk or directory.
disk_total_space() — Returns the total space on a disk or directory.
realpath() — Returns the absolute path of a file or directory.
clearstatcache() — Clears the file status cache, used after modifying file information.
file_exists() — Checks if a file or directory exists.
touch() — Sets the access time and modification time of a file.

Datetime grouped

1. Date and Time Formatting

These functions are used to format dates and times.

date() — Formats a local date and time according to a specified format.
date_create() — Creates a new DateTime object.
date_format() — Formats a DateTime object.
strftime() — Formats a local time/date according to the specified format (locale-dependent).
gmdate() — Formats a GMT date and time.
time() — Returns the current Unix timestamp (seconds since the Unix Epoch).
getdate() — Returns an associative array containing date information.
localtime() — Returns an associative array containing local time information.
microtime() — Returns the current Unix timestamp with microseconds.
date_create_from_format() — Creates a DateTime object from a specific format.
date_parse() — Parses a date and time into an array.

2. Date and Time Parsing and Conversion

These functions are used to parse strings into date/time objects or to convert them into other formats.

strtotime() — Parses an English textual datetime description into a Unix timestamp.
date_parse_from_format() — Parses a date/time string into an associative array based on a specific format.
date_create_from_format() — Creates a DateTime object from a string using a specified format.
getdate() — Retrieves date information from a timestamp.

3. Time Zone Functions

These functions help manage and manipulate time zones.

date_default_timezone_set() — Sets the default time zone for all date/time functions.
date_default_timezone_get() — Gets the default time zone.
timezone_open() — Opens a DateTimeZone object.
timezone_identifiers_list() — Returns a list of all supported time zones.
timezone_name_get() — Gets the name of the time zone.
timezone_offset_get() — Gets the offset from UTC for a time zone.
timezone_transitions_get() — Returns an array of time zone transitions.

4. Date and Time Arithmetic

These functions are used to add or subtract time and calculate intervals.

strtotime() — Parses a relative time string (e.g., +1 day, -1 week) and returns a Unix timestamp.
date_add() — Adds a time interval to a DateTime object.
date_sub() — Subtracts a time interval from a DateTime object.
diff() — Returns the difference between two DateTime objects as a DateInterval object.
date_interval_create_from_date_string() — Creates a DateInterval object from a date string.
date_modify() — Modifies the DateTime object by adding or subtracting time.

5. Time and Date Comparisons

These functions are used to compare date and time values.

date_diff() — Calculates the difference between two DateTime objects.
date_timestamp_get() — Gets the Unix timestamp from a DateTime object.
date_timestamp_set() — Sets the Unix timestamp for a DateTime object.
time() — Returns the current Unix timestamp.

6. Date and Time Information

These functions are used to retrieve specific parts or elements of a date/time.

date("Y-m-d H:i:s") — Formats the current date and time.
gettimeofday() — Returns current Unix timestamp along with microseconds.
localtime() — Returns an associative array containing local time information.
gmdate() — Formats a GMT date and time.
getdate() — Returns an array of date information.

7. Date and Time Validation

These functions are used to check the validity of a given date or time.

checkdate() — Validates a Gregorian date (month, day, year).
is_numeric() — Checks if a value is a valid numeric value for timestamps.
date_create_from_format() — Parses a date string into a DateTime object, useful for validation.

8. Date and Time Intervals

These functions deal with intervals between dates and creating intervals.

date_interval_create_from_date_string() — Creates a DateInterval object from a string (e.g., P1Y2M10DT2H30M).
date_add() — Adds a DateInterval object to a DateTime object.
date_sub() — Subtracts a DateInterval object from a DateTime object.
date_diff() — Calculates the difference between two DateTime objects.
date_interval_format() — Formats a DateInterval object as a string.

9. Miscellaneous Functions

These functions provide additional utility when working with date and time.

time() — Returns the current Unix timestamp.
microtime() — Returns the current Unix timestamp with microseconds.
date_default_timezone_set() — Sets the default time zone for all date/time functions.
date_default_timezone_get() — Gets the default time zone.
strtotime() — Converts an English textual datetime description into a Unix timestamp.

Mysql grouped functions

1. Database Connection Functions

These functions are used for connecting to MySQL databases.

mysqli_connect() — Opens a new connection to the MySQL server (procedural).
mysqli_connect_errno() — Returns the error code from the last connection attempt.
mysqli_connect_error() — Returns a description of the last connection error.
mysqli_select_db() — Selects the database to use (procedural).
mysqli_get_client_version() — Returns the MySQL client version.
mysqli_get_host_info() — Returns the current MySQL host information.
mysqli_get_proto_info() — Returns the MySQL protocol version.

2. Query Execution Functions

These functions execute SQL queries and handle the results.

mysqli_query() — Performs a query on the database (procedural).
mysqli_multi_query() — Performs multiple SQL queries at once (procedural).
mysqli_query() — Executes a single query (returns a result set or true on success).
mysqli_prepare() — Prepares an SQL statement for execution (object-oriented).
mysqli_stmt_prepare() — Prepares a statement for execution (procedural).
mysqli_stmt_execute() — Executes a prepared statement (procedural).
mysqli_stmt_bind_param() — Binds parameters to a prepared statement (procedural).
mysqli_stmt_get_result() — Retrieves the result set from a prepared statement (procedural).

3. Fetching and Retrieving Results

These functions are used to fetch or retrieve data from query results.

mysqli_fetch_assoc() — Fetches a result row as an associative array.
mysqli_fetch_row() — Fetches a result row as a numeric array.
mysqli_fetch_object() — Fetches a result row as an object.
mysqli_fetch_all() — Fetches all result rows as an array (available in MySQLi).
mysqli_fetch_lengths() — Returns the length of the fields in the result set.
mysqli_num_rows() — Returns the number of rows in the result set.
mysqli_num_fields() — Returns the number of fields in a result set.
mysqli_fetch_field() — Retrieves information about a field in the result set.
mysqli_fetch_fields() — Retrieves an array of field information.

4. Prepared Statement Functions

These functions work specifically with prepared statements, which are used to prevent SQL injection.

mysqli_prepare() — Prepares a SQL statement for execution.
mysqli_stmt_bind_param() — Binds variables to a prepared statement as parameters.
mysqli_stmt_bind_result() — Binds variables to store results of a prepared statement.
mysqli_stmt_execute() — Executes a prepared statement.
mysqli_stmt_fetch() — Fetches the results of a prepared statement.
mysqli_stmt_get_result() — Retrieves the result set from a prepared statement.

5. Data Insertion, Update, and Deletion

These functions are used for manipulating data in MySQL.

mysqli_insert_id() — Returns the auto-increment ID generated by the last INSERT query.
mysqli_affected_rows() — Returns the number of affected rows by the last query.
mysqli_query() — Executes an INSERT, UPDATE, or DELETE query (returns true on success).
mysqli_commit() — Commits the current transaction (used with mysqli_begin_transaction()).
mysqli_rollback() — Rolls back the current transaction (used with mysqli_begin_transaction()).
mysqli_autocommit() — Enables or disables autocommit mode.

6. Error Handling Functions

These functions are used for handling errors when working with MySQL.

mysqli_error() — Returns the last error message for the most recent MySQL operation.
mysqli_errno() — Returns the error code for the most recent MySQL operation.
mysqli_sqlstate() — Returns the SQLSTATE error code for the most recent MySQL operation.
mysqli_warning_count() — Returns the number of warnings from the last query.

7. Transaction Management

These functions help manage database transactions.

mysqli_begin_transaction() — Starts a transaction (MySQL 5.5 and higher).
mysqli_commit() — Commits the current transaction.
mysqli_rollback() — Rolls back the current transaction.
mysqli_autocommit() — Turns autocommit mode on or off.
mysqli_set_charset() — Sets the default character set for the connection.

8. Database and Table Management Functions

These functions are used to manage databases, tables, and other schema elements.

mysqli_select_db() — Selects a database to work with.
mysqli_create_db() — Creates a new database.
mysqli_drop_db() — Drops an existing database.
mysqli_query() — Executes a query, like CREATE TABLE, DROP TABLE, etc.
mysqli_list_tables() — Lists all tables in the selected database.
mysqli_list_fields() — Lists fields (columns) of a table.
mysqli_show_tables() — Shows the tables in the selected database.

9. Connection and Session Functions

These functions help manage the MySQL server connection.

mysqli_ping() — Pings the server to check if the connection is still alive.
mysqli_close() — Closes the MySQL connection.
mysqli_get_client_version() — Returns the MySQL client version.
mysqli_get_host_info() — Returns information about the current host connection.
mysqli_get_proto_info() — Returns the protocol version used to communicate with MySQL.
mysqli_get_server_version() — Returns the MySQL server version.

10. Result Set and Field Functions

These functions are used to handle and manipulate the result set.

mysqli_free_result() — Frees the memory associated with a result.
mysqli_field_seek() — Seeks to a specified field in a result set.
mysqli_fetch_field() — Retrieves a single field information from the result.
mysqli_fetch_fields() — Retrieves an array of field information.
mysqli_data_seek() — Seeks to a specified row in a result set.

11. MySQLi and PDO (Object-Oriented Functions)

Both MySQLi and PDO provide object-oriented approaches to working with MySQL databases.

MySQLi Object-Oriented

$mysqli->connect() — Establishes a connection to the database.
$mysqli->query() — Executes a query on the database.
$mysqli->prepare() — Prepares an SQL statement for execution.
$mysqli->bind_param() — Binds variables to a prepared statement.
$mysqli->execute() — Executes a prepared statement.
$mysqli->fetch_assoc() — Fetches a result row as an associative array.

PDO (PHP Data Objects)

$pdo->connect() — Establishes a connection to the database (via a DSN).
$pdo->prepare() — Prepares an SQL statement for execution.
$pdo->execute() — Executes a prepared statement.
$pdo->fetch() — Fetches the next row from a result set.
$pdo->exec() — Executes a query and returns the number of affected rows.

12. Miscellaneous Functions

These are additional functions related to MySQL operations.

mysqli_get_client_version() — Returns the client version of MySQL.
mysqli_get_server_version() — Returns the server version of MySQL.
mysqli_get_charset() — Returns the current character set of the MySQL connection.

String functions grouped

1. String Manipulation Functions

These functions help you manipulate or transform strings.

str_replace() — Replaces all occurrences of a substring within a string.
substr() — Returns a part of a string.
substr_replace() — Replaces part of a string with another string.
str_split() — Splits a string into an array of characters.
explode() — Splits a string into an array by a delimiter.
implode() — Joins elements of an array into a string.
str_pad() — Pads a string to a certain length with another string.
str_repeat() — Repeats a string a specified number of times.
strtr() — Translates characters in a string.
strtoupper() — Converts a string to uppercase.
strtolower() — Converts a string to lowercase.
ucwords() — Capitalizes the first letter of each word in a string.
ucfirst() — Capitalizes the first letter of the string.
lcfirst() — Converts the first letter of the string to lowercase.
trim() — Removes whitespace from the beginning and end of a string.
ltrim() — Removes whitespace or other characters from the left side of a string.
rtrim() — Removes whitespace or other characters from the right side of a string.
str_ireplace() — Case-insensitive version of str_replace().

2. String Searching and Matching

These functions allow you to search for patterns, substrings, or specific characters in a string.

strpos() — Finds the position of the first occurrence of a substring.
strrpos() — Finds the position of the last occurrence of a substring.
str_contains() (PHP 8.0+) — Checks if a substring exists in a string (returns true/false).
str_starts_with() (PHP 8.0+) — Checks if a string starts with a given substring.
str_ends_with() (PHP 8.0+) — Checks if a string ends with a given substring.
strstr() — Finds the first occurrence of a substring and returns the rest of the string from that point.
strrchr() — Finds the last occurrence of a character in a string and returns the rest of the string.
preg_match() — Performs a regular expression match.
preg_match_all() — Performs a global regular expression match.
preg_replace() — Performs a regular expression search and replace.
preg_split() — Splits a string by a regular expression pattern.

3. String Encoding and Decoding

These functions are used for encoding and decoding strings, often for use in different character sets or formats.

base64_encode() — Encodes data in base64.
base64_decode() — Decodes base64-encoded data.
urlencode() — Encodes a string for use in a URL.
urldecode() — Decodes a URL-encoded string.
rawurlencode() — Encodes a string for use in a URL, with a different encoding scheme.
rawurldecode() — Decodes a raw URL-encoded string.
htmlentities() — Converts special characters to HTML entities.
htmlspecialchars() — Converts special characters to HTML entities, but with fewer characters.
html_entity_decode() — Converts HTML entities back to their corresponding characters.
utf8_encode() — Encodes a string to UTF-8.
utf8_decode() — Decodes a UTF-8 string to ISO-8859-1.

4. String Length and Comparison

These functions help measure and compare string lengths, as well as compare two strings.

strlen() — Returns the length of a string.
mb_strlen() — Returns the length of a string (multibyte-safe).
strcmp() — Compares two strings (case-sensitive).
strcasecmp() — Compares two strings (case-insensitive).
strncmp() — Compares the first n characters of two strings (case-sensitive).
strncasecmp() — Compares the first n characters of two strings (case-insensitive).
strnatcmp() — Compares two strings using a natural order algorithm.
strnatcasecmp() — Compares two strings using a natural order algorithm (case-insensitive).

5. String Positioning and Substring Extraction

These functions deal with finding or manipulating positions and substrings within a string.

strchr() — Alias of strstr(), finds the first occurrence of a character in a string.
strrchr() — Alias of strrpos(), finds the last occurrence of a character in a string.
strstr() — Finds the first occurrence of a substring in a string.
substr() — Extracts a portion of a string.
substr_count() — Counts the number of occurrences of a substring in a string.
substr_compare() — Compares part of two strings.
strpbrk() — Searches a string for any of a set of characters.
strspn() — Returns the length of the initial segment of a string that consists entirely of characters contained in a given mask.

6. String Formatting

These functions allow you to format or manipulate strings for output.

sprintf() — Returns a formatted string.
printf() — Outputs a formatted string.
vsprintf() — Returns a formatted string, similar to sprintf(), but accepts an array as arguments.
vprintf() — Outputs a formatted string, similar to printf(), but accepts an array as arguments.
number_format() — Formats a number with grouped thousands.
chr() — Returns a character from a given ASCII code.
ord() — Returns the ASCII code of a character.
pack() — Packs data into a binary string.
unpack() — Unpacks data from a binary string.

7. String Case Conversion

These functions are for changing the case of strings.

strtoupper() — Converts a string to uppercase.
strtolower() — Converts a string to lowercase.
ucfirst() — Capitalizes the first letter of a string.
lcfirst() — Converts the first letter of a string to lowercase.
ucwords() — Capitalizes the first letter of each word in a string.
mb_convert_case() — Converts the case of a string (multibyte-safe).
str_ireplace() — Case-insensitive version of str_replace().

8. String Trimming and Whitespace Handling

These functions are used for managing whitespace in strings.

trim() — Removes whitespace (or other characters) from the beginning and end of a string.
ltrim() — Removes whitespace (or other characters) from the left side of a string.
rtrim() — Removes whitespace (or other characters) from the right side of a string.
str_word_count() — Counts the number of words in a string.
preg_replace() — Can be used to remove unwanted whitespace patterns with regular expressions.

9. String Conversion and Parsing

These functions help in converting strings from one format to another.

strval() — Converts a variable to a string.
intval() — Converts a string to an integer.
floatval() — Converts a string to a float.
parse_str() — Parses a query string into variables.
str_getcsv() — Parses a CSV string into an array.

10. Regular Expression Functions

These functions are used for matching and manipulating strings with regular expressions.

preg_match() — Performs a regular expression match.
preg_match_all() — Performs a global regular expression match.
preg_replace() — Performs a regular expression search and replace.
preg_split() — Splits a string by a regular expression pattern.
preg_grep() — Returns an array of elements matching a regular expression.
preg_filter() — Filters elements of an array using a regular expression.

11. Miscellaneous String Functions

These are some additional string-related functions that don’t fit in the other categories.

str_repeat() — Repeats a string a specified number of times.
str_shuffle() — Randomly shuffles all characters in a string.
str_rot13() — Encodes a string using the ROT13 cipher.
soundex() — Returns the soundex key of a string (used for phonetic matching).
metaphone() — Returns the metaphone key of a string (used for phonetic matching).

Array functions grouped

1. Array Functions that Apply a Callback

These functions allow you to apply a callback function to each element of an array.

array_map() — Applies a callback to each element of an array (creates a new array).
array_walk() — Applies a callback to each element of an array (modifies the array in place).
array_walk_recursive() — Applies a callback to each element of an array recursively.
array_filter() — Filters elements of an array using a callback function.
array_reduce() — Reduces an array to a single value using a callback function.
array_flip() — Exchanges all keys and values in an array.
array_column() — Returns the values from a single column of the input array.

2. Array Functions for Checking Existence

These functions are used to check if a specific element or key exists in an array.

array_key_exists() — Checks if a specific key exists in the array.
array_key_first() — Returns the first key of an array.
array_key_last() — Returns the last key of an array.
array_search() — Searches for a value in an array and returns its key.
in_array() — Checks if a value exists in an array.
array_contains() (PHP 8.1 and later) — Checks if a value exists in an array.
array_flip() — Flips the array (keys become values and values become keys), so you can check if a value exists as a key.
array_search() — Searches for a value in an array and returns the corresponding key.
array_is_list() — Checks if the array is a list (numeric keys only).

3. Array Functions for Sorting and Ordering

These functions are used to sort or manipulate the order of elements in an array.

sort() — Sorts an array in ascending order.
rsort() — Sorts an array in descending order.
asort() — Sorts an array in ascending order, maintaining key-value relations.
arsort() — Sorts an array in descending order, maintaining key-value relations.
ksort() — Sorts an array by key in ascending order.
krsort() — Sorts an array by key in descending order.
natsort() — Sorts an array using a natural order algorithm (numeric order).
natcasesort() — Sorts an array using a natural order algorithm, ignoring case.
usort() — Sorts an array by values using a user-defined comparison function.
uksort() — Sorts an array by keys using a user-defined comparison function.
uasort() — Sorts an array by values using a user-defined comparison function while maintaining key-value relations.

4. Array Functions for Modifying or Manipulating Arrays

These functions are used to modify arrays in various ways.

array_merge() — Merges two or more arrays into one.
array_merge_recursive() — Merges arrays recursively.
array_slice() — Extracts a portion of an array.
array_splice() — Removes a portion of the array and optionally replaces it.
array_replace() — Replaces elements of an array with elements of another array.
array_diff() — Computes the difference of arrays.
array_diff_assoc() — Computes the difference of arrays including keys.
array_intersect() — Computes the intersection of arrays.
array_intersect_assoc() — Computes the intersection of arrays including keys.
array_chunk() — Splits an array into chunks.
array_pad() — Pads an array to a certain length with a value.
array_fill() — Fills an array with values.
array_flip() — Swaps all keys with values.
array_reverse() — Reverses an array.

5. Array Functions for Aggregation and Summarization

These functions help you summarize or aggregate data from arrays.

array_sum() — Returns the sum of all values in an array.
array_product() — Returns the product of all values in an array.
array_count_values() — Counts all values in an array.
array_unique() — Removes duplicate values from an array.
array_map() — Applies a callback function to each element in an array (returns a new array).
array_filter() — Filters elements of an array using a callback function.
array_reduce() — Reduces an array to a single value using a callback function.

6. Array Functions for Key and Value Manipulation

These functions are used for working with keys and values in arrays.

array_keys() — Returns all keys of an array.
array_values() — Returns all values of an array.
array_flip() — Exchanges keys and values.
array_rand() — Picks one or more random keys from an array.
array_key_first() — Returns the first key of an array.
array_key_last() — Returns the last key of an array.

7. Array Functions for Array Information and Properties

These functions are used for getting information about the array.

count() — Counts the number of elements in an array.
array_length() — Returns the length of an array (similar to count()).
array_is_list() — Checks if the array is a list (numerically indexed).
array_chunk() — Splits an array into chunks.
array_filter() — Filters elements in the array based on a callback.
array_flip() — Flips keys and values in an array.

8. Array Functions for Recursive Operations

These functions work with arrays that may be multidimensional (nested arrays).

array_walk_recursive() — Applies a callback function to each element of an array recursively.
array_map() — Can be used recursively if you apply it to multidimensional arrays (via callback).
array_filter() — Can be used with a recursive callback if the array is multidimensional.
array_merge_recursive() — Merges arrays recursively, handling multidimensional arrays.

9. Other Miscellaneous Array Functions

These functions don’t fit neatly into other categories but are useful for specific tasks.

array_diff_key() — Computes the difference of arrays using keys.
array_intersect_key() — Computes the intersection of arrays using keys.
array_multisort() — Sorts multiple arrays or multidimensional arrays.
array_walk() — Applies a callback to each element of an array.
array_rand() — Picks one or more random elements from an array.
array_flip() — Swaps keys and values.
array_replace() — Replaces elements of an array with values from another array.

array filter using call back function

function test($var) {

$r=($var>14)?1:0;

return $r;

}

$array=[13,12,34];

print_r(array_filter($array, "test"));

Array ( [2] => 34 )