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<?php ini_set('memory_limit', '512m'); $max = 100000; $arr = range(1,$max,3); $arr2 = range(1,$max,2); $arr = array_merge($arr,$arr2); //echo '<pre>'; print_r($arr); echo '</pre>'; // ----------------------------------------- $time = -microtime(true); $res1 = array_unique($arr); $time += microtime(true); echo "deduped to ".count($res1)." in ".$time; //echo '<pre>'; print_r($res1); echo '</pre>'; // deduped to 666667 in 32.300781965256 unset($res1); $time = -microtime(true); $res2 = array(); foreach($arr as $key=>$val) { $res2[$val] = true; } $res2 = array_keys($res2); $time += microtime(true); echo "<br />deduped to ".count($res2)." in ".$time; //echo '<pre>'; print_r($res2); echo '</pre>'; // deduped to 666667 in 0.84372591972351 unset($res2); // array_flip $time = -microtime(true); $res3 = array_flip(array_flip($arr)); //$res3 = array_flip($res3); $time += microtime(true); echo "<br />deduped to ".count($res3)." in ".$time;

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33.65 ms | 402 KiB | 5 Q