Convert a string to ASCII numeric value

<?php
function string_to_ascii($string){
     
$ascii = NULL;
      for (
$i = 0; $i < strlen($string); $i++) {
        
$ascii[] = ord($string[$i]); //to array
         //$ascii += ord($string[$i]); //add value up to int limit 65000+
         //$ascii .= ord($string[$i]); //long string of numbers
     
}
      return(
$ascii);
}
?>
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