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PHP 松散类型比较表

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Release： 2016-06-20 12:54:32
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在使用这些表格之前，需要明白变量类型及它们的意义。例如，"42" 是一个字符串,而42 是一个整数。FALSE 是一个布尔值,而 "false" 是一个字符串

在没有定义变量 $x 的时候，如 if ($x) 的用法会导致一个 E_NOTICE 级别的错误。所以，可以考虑用 empty() 或者 isset() 函数来初始化变量。

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