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How to use PHP delimiter eof

小云云
Release： 2023-03-22 09:42:01
Original
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PHP是一个Web编程语言，在编程过程中难免会遇到用echo来输出大段的html和javascript脚本的情况，如果用传统的输出方法 ——按字符串输出的话，肯定要有大量的转义符来对字符串中的引号等特殊字符进行转义，以免出现语法错误。如果是一两处还可以容忍，但是要是一个完整的 html文本或者是一个100行的js我想是谁都会崩溃的。这就是PHP为什么要引入一个定界符的原因——至少一大部分原因是这样的。

1.PHP定界符的作用就是按照原样，包括换行格式什么的，输出在其内部的东西；
2.在PHP定界符中的任何特殊字符都不需要转义；
3.PHP定界符中的PHP变量会被正常的用其值来替换。

PHP中的定界符格式是这样的：

<<<Eof
……
Eof;
Copy after login

比如：

$url = &#39;http://baidu.com&#39;;
$js = <<<eof
<script type="text/javascript">
window.top.location.href = "$url?login";
</script>
eof;//此结束符前不要有任何空格
echo $js;
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相关推荐：

php的定界符heredoc技术详解

PHP定界符<<<eof 使用

PHP 定界符 使用技巧_PHP教程

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