Question

How to use ctype_alnum() to check if all of the characters in a string are alphanumeric in PHP

Answer 1

$str = array('ABCEE8xyz99', 'wwww@$%%879OOP');
foreach ($str as $s) 
{
    if (ctype_alnum($s)) 
        echo "string: $s - include only letters or digits (alphanumeric) <br />";
    else 
        echo "string: $s - NOT include only letters or digits (alphanumeric)<br />";
}


/*
run: 

string: ABCEE8xyz99 - include only letters or digits (alphanumeric)
string: wwww@$%%879OOP - NOT include only letters or digits (alphanumeric)

*/

 

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