Comments
PHP supports 'C', 'C++' and Unix shell-style (Perl style) comments. For example:
<?php
????echo?'This?is?a?test';?//?This?is?a?one-line?c++?style?comment
????/*?This?is?a?multi?line?comment
???????yet?another?line?of?comment?*/
????echo?'This?is?yet?another?test';
????echo?'One?Final?Test';?#?This?is?a?one-line?shell-style?comment
?>The "one-line" comment styles only comment to the end of the line or the current block of PHP code, whichever comes first. This means that HTML code after // ... ?> or # ... ?> WILL be printed: ?> breaks out of PHP mode and returns to HTML mode, and // or # cannot influence that. If the asp_tags configuration directive is enabled, it behaves the same with // %> and # %>. However, the </script> tag doesn't break out of PHP mode in a one-line comment.
<h1>This?is?an?<?php?#?echo?'simple';?>?example</h1>
<p>The?header?above?will?say?'This?is?an??example'.</p>'C' style comments end at the first */ encountered. Make sure you don't nest 'C' style comments. It is easy to make this mistake if you are trying to comment out a large block of code.
<?php
?/*
????echo?'This?is?a?test';?/*?This?comment?will?cause?a?problem?*/
?*/
?>← Instruction separation
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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