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HomeBackend DevelopmentPHP TutorialUse of PHP EOF (heredoc), eofheredoc_PHP tutorial

Usage of PHP EOF (heredoc), eofheredoc

<?php
/*
Heredoc技术,在PHP手册和技术书籍中一般没有详细讲述,只是提到了这是一种Perl风格的字符串输出技术。
目前一些论坛程序和CMS系统使用了这种技术,前不久看一个朋友的PHPWIND论坛时碰到过使用这种技术的。
如果你需要在PHP中写大块的HTML拼装操作,这不失为是一种很好的选择,因为你不需要担心引号带的问题,
也省去了字符串连接的繁琐。
*/
//如下例子:
$var = 'PHP变量';
echo <<<EOF
    <div>
        PHP heredoc技术
        <br />
        $var
    </div>
EOF;

echo <<<zhangshan
    <hr />
    <div>
        PHP heredoc技术
        <br />
        $var
    </div>
zhangshan;


/*
注意:

1.herdoc 以&ldquo;<<<End&rdquo;开始标记开始,以&ldquo;End;&rdquo;结束标记结束,结束标记必须单独占一行、
  前面不能有任何字符串包括空格,结尾要有分号结束。

2.结束开始标记必须相同,比如常用大写的EOT、EOD、EOF来表示,不是必须使用这3个标记,
  和PHP的变量名规则基本相同,一般使用约定都是大写。

3.开始和结束标记之间的PHP变量会被解析,函数不会执行、不能进行运算操作。
  变量之间的连接不需要字符串连接符。

4.标记字符串不能在开始结束标记之间出现一样的字符串,区分大小写。
*/

//例如下面:
$a = 12;
$b = 12;
$arr = array('hello'=>'world');
echo <<<EOF
    <div>
        PHP heredoc技术
        <br />
        $a$b
        <br />
        $a+$b
        <br />
        {$arr['hello']}
    </div>
EOF;

 

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