$arraysAreEqual = ($a == $b); // TRUE if $a and $b have the same key/value pairs.
$arraysAreEqual = ($a === $b); // TRUE if $a and $b have the same key/value pairs in the same order and of the same types.
编辑
不等式运算符是
!=，而非身份运算符是
!==要匹配相等运算符
==和身份运算符
===。
