Programming PHP, 2nd Edition

Accessing Individual Characters

The strlen( ) function returns the number of characters in a string:

    $string = 'Hello, world';
    $length = strlen($string);             // $length is 12

You can use the string offset syntax on a string to address individual characters:

    $string = 'Hello';
    for ($i=0; $i < strlen($string); $i++) {
      printf("The %dth character is %s\n", $i, $string{$i});
    }
    The 0th character is H
    The 1th character is e
    The 2th character is l
    The 3th character is l
    The 4th character is o