(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_xdigit — Check for character(s) representing a hexadecimal digit
ctype_xdigit ( mixed $text ) : bool
Checks if all of the characters in the provided string, text, are hexadecimal 'digits'.
text
The tested string.
Note:
If an int between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.
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.
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.
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https://www.php.net/manual/en/function.ctype-xdigit.php