note 82045 added to function.array-count-values

byron at byronrode dot co dot za, just using count(array_keys($haystack, $needle)) is about three times faster. Alternatively, if you're concerned about memory, you can just increment $number_of_instances instead of keeping an array of equal values. <?php $haystack = Array(); for ($i = 0; $i < 1000000; $i++) { $haystack[] = rand(1, 2000); } $needle = rand(1, 2000); // count(array_keys()) $start = microtime(true); echo count(array_keys($haystack, $needle))."\n"; echo (microtime(true) - $start)."\n"; // 0.08 // $needle_array[] $start = microtime(true); $x = count($haystack); for($i = 0; $i < $x; $i++){ if($haystack[$i] == $needle){ $needle_array[] = $haystack[$i]; } } $number_of_instances = count($needle_array); echo $number_of_instances."\n"; echo (microtime(true) - $start)."\n"; // 0.25 // $number_of_instances++; $start = microtime(true); $x = count($haystack); $number_of_instances = 0; for($i = 0; $i < $x; $i++){ if($haystack[$i] == $needle){ $number_of_instances++; } } echo $number_of_instances."\n"; echo (microtime(true) - $start)."\n"; // 0.25 ?> ---- Server IP: 208.69.120.35 Probable Submitter: 65.44.120.114 ---- Manual Page -- http://www.php.net/manual/en/function.array-count-values.php Edit -- https://master.php.net/note/edit/82045 Del: integrated -- https://master.php.net/note/delete/82045/integrated Del: useless -- https://master.php.net/note/delete/82045/useless Del: bad code -- https://master.php.net/note/delete/82045/bad+code Del: spam -- https://master.php.net/note/delete/82045/spam Del: non-english -- https://master.php.net/note/delete/82045/non-english Del: in docs -- https://master.php.net/note/delete/82045/in+docs Del: other reasons-- https://master.php.net/note/delete/82045 Reject -- https://master.php.net/note/reject/82045 Search -- https://master.php.net/manage/user-notes.php