getting the key name for a value

<? $array = [ 'a' => 'dog', 'b' => 'cat', 'c' => 'cow', 'd' => 'duck', 'e' => 'goose', 'f' => 'elephant' ]; print_r(array_find_key($array,function($v){ return ($v=="goose");})); ?>

Seraching key and retuning value

<?php

 $search_array = array('first' => 1334, 'second' => 4);

echo (array_key_exists('first', $search_array)==true?$search_array['first']:0);  //1334

?>

array_filter( ) simplified

 $elements=[13,45,101,33,1,0];

$arr= array_filter($elements,function($value){ return($value>100);  });

print_r($arr);   //101

searching in string as array

 $text="Gobierno afirma que el país tiene la segunda canasta alimentaria más baja de la región";

echo in_array(strtolower('GoBierno'),$arr1=explode(' ',strtolower($text)));  //1

print_r($arr1);

custom array filter values

$arr=[12,31,14,101,9,220];

function test(array $arr,int $val){

  if(gettype($arr)!="array" || gettype($val)!="integer"){ return 0; exit();}

  $holder=array();

foreach($arr as $key=>$value){

  

 if($value>$val){ $holder[]=$value;}

}

 return $holder;                 

}

$holder=test($arr,20);

print_r($holder);

echo "<br>";

echo count($arr)==count($holder)?"all_values_match":(count($holder)>0?"any_match":-1);

variable filter

 $parameter="bob@example.com";

echo filter_var($parameter, FILTER_VALIDATE_EMAIL)==false?-1:$parameter;

//bob@example.com

https://www.php.net/manual/en/function.filter-var.php

https://www.php.net/manual/en/filter.constants.php#constant.filter-validate-int

Array filter

 <?php

$arr=["name"=>"Ambx","lastname"=>"Rodriguez","Placencio"];

$d=array_filter($arr,function($value){ return (strlen($value)>6);});

print_r($d);

?>