What are the ways to add comments in php?

Comments in the program should express the processing instructions of the program in simple, clear, and precise language. Avoid using comments for each line of the program. You can add a comment in front of a program to have clear processing logic. So, what are the ways to add comments in php?

Several ways to add comments to PHP code:

1. Start with //, as Single line comments. For example:

<?php
    // Author: mole
    // Date:2012-2-8
    echo "Welcome!";
?>

2. Start with # as a single-line comment. For example:

<?php
    # Author: mole
    # Date:2012-2-8
    echo "Welcome!";
?>

3. Multi-line comments starting with /* and ending with * /. For example:

<?php
    /*
      下面是计算员工平均
      工资的函数

    * /
    calculate();

?>

Note: There should be no space between * and / above.

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