what is the work of ord.php file in php

The ord() function is a inbuilt function in PHP that returns the ASCII value of the first character of a string.
This function takes a character string as a parameter and returns the ASCII value of the first character of this string.
  
Syntax:
"int ord($string)"

Example:
  <?php
    echo ord("A")."<br>";  // ASCII value of 'A' is 65. So, the Output: 65.
    echo ord("ANUP KB")."<br>";  //Output: 65, as 'A' is the first Character. 
   ?>