等号和恒等号
时间：2008-02-26 来源：octans
$a == $b
Equal，TRUE if $a is equal to $b.
$a === $b
Identical，TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4)
Equal，TRUE if $a is equal to $b.
$a === $b
Identical，TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4)
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