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php数组索引的Key加引号和不加引号的区别

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Release： 2016-06-06 20:19:20
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这篇文章主要介绍了php数组索引的Key加引号和不加引号的区别,加引号和不加引号是有严重的区别的,需要的朋友可以参考下

今天在看一个PHP博客时留意了这么一句话：“PHP中的索引KEY值如果不用引号括起来的话，会将索引KEY值解释为一个常量，当找不到该常量的定义时，，才将其解释为一个字符串”。我有点不太相信，因为我一直都会将索引KEY用引号括起来，从而没有出现这种情况。趁现在有时间正好写行代码测试一下：

复制代码 代码如下:


define('WEBHOST','blog');

$wso = array();

$wso['blog'] = 'www.weixiaodeyu.com';

$wso['WEBHOST'] = 'www.jb51.net';

echo $wso[WEBHOST];  //output


果然，输出的竟然是，而不是。现在知道索引KEY值加上引号的重要性了吧。如果出现了意想不到的错误可要检查一下了。其实严格执行语言规范就不会出现这种难以调试的错误。
Related labels：
key php quotation marks array
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