PHP Comments

Comments in PHP

A comment in PHP code is a line that is not executed as a part of the program. Its only purpose is to be read by someone who is looking at the code.

Comments can be used to:

• Let others understand your code
• Remind yourself of what you did - Most programmers have experienced coming back to their own work a year or two later and having to re-figure out what they did. Comments can remind you of what you were thinking when you wrote the code

PHP supports several ways of commenting:

Syntax for single-line comments:

 < !DOCTYPE class="attributecolor" style="color:red"> html="tagcolor" style="color:mediumblue">>
< html class="tagcolor" style="color:mediumblue">>
< body class="tagcolor" style="color:mediumblue">>

< ?php
class="phpnumbercolor" style="color:red"> class="commentcolor" style="color:green">
// This is a single-line comment

class="phpnumbercolor" style="color:red"> class="commentcolor" style="color:green">
# This is also a single-line comment
class="phptagcolor" style="color:red">?>

< /body class="tagcolor" style="color:mediumblue">>
< /html class="tagcolor" style="color:mediumblue">> 

Syntax for multiple-line comments:

 < !DOCTYPE class="attributecolor" style="color:red"> html="tagcolor" style="color:mediumblue">>
< html class="tagcolor" style="color:mediumblue">>
< body class="tagcolor" style="color:mediumblue">>

< ?php
class="phpnumbercolor" style="color:red"> class="commentcolor" style="color:green">/*
This is a multiple-lines comment block
that spans over multiple
lines
*/
class="phptagcolor" style="color:red">?>

< /body class="tagcolor" style="color:mediumblue">>
< /html class="tagcolor" style="color:mediumblue">> 

Using comments to leave out parts of the code:

 < !DOCTYPE class="attributecolor" style="color:red"> html="tagcolor" style="color:mediumblue">>
< html class="tagcolor" style="color:mediumblue">>
< body class="tagcolor" style="color:mediumblue">>

< ?php
class="phpnumbercolor" style="color:red"> class="commentcolor" style="color:green">
// You can also use comments to leave out parts of a code line
$x = class="phpnumbercolor" style="color:red">5 class="commentcolor" style="color:green">
/* + 15 */ + class="phpnumbercolor" style="color:red">5;
class="phpkeywordcolor" style="color:mediumblue">echo $x;
class="phptagcolor" style="color:red">?>

< /body class="tagcolor" style="color:mediumblue">>
< /html class="tagcolor" style="color:mediumblue">>