Question

How to use ctype_xdigit() function to check if all characters in a string are hexadecimal digits in PHP

Answer 1

$arr = array('AB10FC9', 'FFFR', 'ab02d99');
     
foreach ($arr as $s) 
{
    if (ctype_xdigit($s)) 
        echo "$s is all hexadecimal characters <br />";
    else
        echo "$s is NOT all hexadecimal characters <br />";
}
     
/*
run:
   
AB10FC9 is all hexadecimal characters
FFFR is NOT all hexadecimal characters
ab02d99 is all hexadecimal characters 
      
*/

 

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