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PHP empty函数报错:Fatal error: Can't use function return value in write context解决方法 - 站长搜索
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PHP empty函数报错:Fatal error: Can't use function return value in write context解决方法

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2015-01-01 05:54:03 转载来源: 网络整理/侵权必删

本文为大家讲解的是PHP empty函数报错:Fatal error: Can't use function return value in write context解决方法,感兴趣的同学参考下. PHP开发时,当你使用empty检查一个函数返回的结果时会报错:Fatal error: Can't use function return value in write context 例如下面的代码: <?php echo empty(strlen('test')); 转到PHP手册里面查看,在empty函数描述的地方有以下文字: Note :  empty()  only checks variables as anything else will result in a parse error

本文为大家讲解的是PHP empty函数报错:Fatal error: Can't use function return value in write context解决方法,感兴趣的同学参考下.

PHP开发时,当你使用empty检查一个函数返回的结果时会报错:Fatal error: Can't use function return value in write context

例如下面的代码:


<?php
echo empty(strlen('test'));

转到PHP手册里面查看,在empty函数描述的地方有以下文字:

Note :  empty()  only checks variables as anything else will result in a parse error. In other words, the following will not work: empty(trim($name)).


得出结论:empty()只检测变量,检测任何非变量的东西都将导致解析错误!

因此,我们不能拿empty来直接检测函数返回的值,上面例子的解决方法如下:


<?php
$length = strlen('test');
echo empty($length);

标签: PHP empty 函数 报错 Fatal error Can use function


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