【性能为王】从PHP源码剖析array_keys和array_unique

$test=array();
for($run=0; $run<10000; $run++)
$test[]=rand(0,100);

$time=microtime(true);

$out = array_unique($test);

$time=microtime(true)-$time;
echo "Array Unique: ".$time."
";

$time=microtime(true);

$out=array_keys(array_flip($test));

$time=microtime(true)-$time;
echo "Keys Flip: ".$time."
";

$time=microtime(true);

$out=array_flip(array_flip($test));

$time=microtime(true)-$time;
echo "Flip Flip: ".$time."
";