PHP supports 3 styles of comments
1.C style (//) comments
This kind of comment cannot appear in the ?> tag. If the short_open and asp_tag settings are turned on, > and %> also cannot appear in the comment
<?<span>php
</span><span>echo</span> 'Hello,PHP!'; <span>//</span><span>我是注释，不被执行 </span>
?>2.C language style, nested comments are not allowed
<?<span>php
</span><span>/*</span><span>
*我是注释，不被执行
</span><span>*/</span>
<span>echo</span> ‘Hello，PHP!<span>’;
</span>?>3.Shell style, same as C ban
<?<span>php
</span><span>echo</span> 'Hello,PHP!'; <span>#</span><span>我是注释，不被执行</span>
?>
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