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Homephp教程php手册关于PHP结束标签的使用细节探讨及联想

PHP解析文件时会寻找开始?php和结束标记?,标记告诉PHP开始和停止解释其中的代码,接下来将详细介绍下PHP结束标签的使用细节感兴趣的你可以参考下本文或许可以帮助到你

当PHP解析一个文件时,会寻找开始,标记告诉PHP开始和停止解释其中的代码。此种方式的解析可以使PHP嵌入到各种不同的文档中,凡是在一对开始和结束标记之外的内容都会被PHP解析器忽略。大多数情况下PHP都是嵌入在HTML文档中的。

单行注释仅仅注释到行末或者当前的 PHP 代码块,视乎哪个首先出现。这意味着在 // ... ?> 或者 # ... ?>之后的 HTML 代码将被显示出来:?> 跳出了 PHP 模式并返回了 HTML 模式,// 或 #并不能影响到这一点。

由以上讨论可可知,即使?>出现在//注释中,PHP解析器也会认为PHP解析结束(当 PHP 碰到结束标记 ?> 时,就简单地将其后的内容原样输出( 除非其后紧接着一个新行,参见指令分隔符)直到碰到下一个开始标记为止)。
代码如下:
//$a = 'testtest';
//preg_match_all('|]+href="([^\"]*)".*?>|', $a, $b);
//print_r($b);

输出为:
代码如下:
:!php preg.php
|', $a, $b);
//print_r($b);

如何修正上述问题呢?或者你使用/* */进行注释,或者将?>用字符串连接符进行连接,如下:
代码如下:
$a = '
testtest';
preg_match_all('|]+href="([^\"]*)".*?'.'>|', $a, $b);
print_r($b);

这一细节同样适用于JS结束标签
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