Question

How to use ctype_alnum() function to check if all characters in a string are alphanumeric (letters and/or digits) in PHP

Answer 1

$arr = array('abcXYZ', 'AbCd1fgH7', 'xyz@!$wsp', '123');
    
foreach ($arr as $s) 
{
    if (ctype_alnum($s)) 
        echo "$s is letters and/or digits <br />";
    else
        echo "$s is NOT just letters and/or digits <br />";
}
    
/*
run:
  
abcXYZ is letters and/or digits
AbCd1fgH7 is letters and/or digits
xyz@!$wsp is NOT just letters and/or digits
123 is letters and/or digits  
     
*/

 

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