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array_udiff的不解

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Release： 2016-06-13 12:30:12
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array_udiff的困惑
今天看书,书中有一个例子用到了array_udiff,查了下手册,经过测试,还是对其一知半解.

$a = array(1,2,3,4,5);<br />
$b = array(1,6,3,4,5);<br />
echo "<pre class="brush:php;toolbar:false">";<br />
print_r(array_udiff($a,$b,function($a,$b){<br />
	return ($a === $b)? 0:1;<br />
}));
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我希望的得到的结果:
Array<br />
(<br />
    [0] => 2<br />
)
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实际结果
Array<br />
(<br />
    [0] => 1<br />
    [1] => 2<br />
    [2] => 3<br />
    [4] => 5<br />
)
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Related labels：
array gt nbsp return
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