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PHP 自定义字符串中的变量名解析

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Release： 2016-06-23 13:59:30
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这样一个需求：页面的 title 可以在后台自定义，自定义内容中可能包含变量，变量用 {$var} 表示， 其中 $var 为变量名

将 title 字段存入数据库中，再提出来之后，用php自己的变量名解析就不管用了，会直接输出 {$var} ，不会像在定义字符串的时候，用双引号时就会自动把 {$var} 变换成相应的变量内容，这里就像是用单引号定义的字符串，所以需要自己解析。

这里的思路是用正则表达式把字符串中的所有 {$var} 提取出来，然后判断是否存在相应的变量，如果存在，用 str_replace() 替换相应的内容

程序如下：

<?php $prefix = '前缀';$name = '主题名称';$postfix = '后缀';$title = '{$prefix} {$name} 最新新闻 {$postfix}';$match = array();preg_match_all('/{\$(.*?)}/', $title, $match);foreach($match[1] as $key => $value) {    if(isset($$value)) {        $title = str_replace($match[0][$key], $$value, $title);    }}echo $title;
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PHP 自定义字符串中的变量名解析
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