PHP ctype_xdigit() Function Usage and Example

PHP Ctype Function Manual

The ctype_xdigit() function checks if the string contains only hexadecimal characters .

Syntax

ctype_xdigit( $text );

Definition and Usage

This function checks if all characters in the provided string are hexadecimal 'digits'.

Parameter

Return value

If each character in the text is a hexadecimal 'digit' (i.e., a decimal digit or [-Fa-If any character in the string is not a hexadecimal 'digit' (i.e., a decimal digit or [

Online Example

<?php
　　　\$strings = array('ABCDEF', 'SAI!@#$', 'ab12bc99','FF10BC99', 'DDDD', 'ffff');
　　　
　　　foreach (\$strings as \$test) {
　　　　　　if (ctype_xdigit(\$test)) {
　　　　　　　　　echo "\$test composed of hexadecimal digits.\n";
　　　　　　}else {
　　　　　　　　　echo "\$test contains non-hexadecimal numbers.\n";
　　　　　　}
　　　}
?>

Output result:

ABCDEF composed of hexadecimal digits.
SAI!@#$ contains non-hexadecimal numbers.
ab12bc99　composed of hexadecimal digits.
FF10BC99　composed of hexadecimal digits.
DDDD composed of hexadecimal digits.
ffff composed of hexadecimal digits.

　 　PHP Ctype Function Manual