How to use PHP delimiter eof
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;
比如:
$url = 'http://baidu.com'; $js = <<<eof <script type="text/javascript"> window.top.location.href = "$url?login"; </script> eof;//此结束符前不要有任何空格 echo $js;
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