Php ctype xdigit () function

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(PHP 4 >= 4.0.4, PHP 5)

ctype_xdigit -- Check for character(s) representing a hexadecimal digit

Syntax

bool ctype_xdigit ( string text )

Checks if all of the characters in the provided string, text, are hexadecimal 'digits'.

Parameters

text: The tested string.

Return Values

Returns TRUE if every character in text is a hexadecimal 'digit', that is a decimal digit or a character from [A-Fa-f] , FALSE otherwise.

Examples

Example 1. A ctype_xdigit() example


<?php
$strings = array('AB10BC99', 'AR1012', 'ab12bc99');
foreach ($strings as $testcase) {
    if (ctype_xdigit($testcase)) {
        echo "The string $testcase consists of all hexadecimal digits.\n";
    } else {
        echo "The string $testcase does not consist of all hexadecimal digits.\n";
    }
}
?>

The above example will output:

The string AB10BC99 consists of all hexadecimal digits.
The string AR1012 does not consist of all hexadecimal digits.
The string ab12bc99 consists of all hexadecimal digits.

Php ctype xdigit Function syntax tag

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Php ctype xdigit syntax tutorial

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