ctype_digit() example Digits

<?php
$strings = array('1820.20', '10002', 'wsl!12');
foreach ($strings as $testcase) {
    if (ctype_digit($testcase)) {
        echo "The string $testcase consists of all digits.\n";
    } else {
        echo "The string $testcase does not consist of all digits.\n";
    }
}
?>

Example #2 A ctype_digit() example comparing strings with integers

<?php

$numeric_string = '42';$integer        = 42;ctype_digit($numeric_string);  // truectype_digit($integer);         // false (ASCII 42 is the * character)is_numeric($numeric_string);   // trueis_numeric($integer);          // true?>