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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);
$b = array(1,6,3,4,5);
echo "";
print_r(array_udiff($a,$b,function($a,$b){
return ($a === $b)? 0:1;
}));
我希望的得到的结果:Array
(
[0] => 2
)
实际结果Array
(
[0] => 1
[1] => 2
[2] => 3
[4] => 5
)