how to comment a php code code example

Example 1: comment in php

<?php
 /*
    echo 'This is a test'; /* This comment will cause a problem */
 */
?>

Example 2: php comment

<?php
// This is a single-line comment

# This is also a single-line comment
  
/*
This is a multiple-lines comment block
that spans over multiple
lines
*/
  
// You can also use comments to leave out parts of a code line
$x = 5 /* + 15 */ + 5;
echo $x;
?>