Doc #53422 [NEW]: Foreach faster than in_array() and array_search()

From: Operating system: ubuntu 10.04 PHP version: Irrelevant Package: Documentation problem Bug Type: Documentation Problem Bug description:Foreach faster than in_array() and array_search() Description: ------------ --- From manual page: http://www.php.net/function.in-array --- <?php clearstatcache(); $time_start = microtime(true); // generate an array $arr = array(); for($i=0; $i<100000; $i++) { $key = rand(0, 100000000); $val = rand(0, 100000000); $arr["{$key}"] = "{$val}"; } $time_end = microtime(true); $time = $time_end - $time_start; //round(, 6); echo "Time for cretion of array: {$time} seconds"; clearstatcache(); ///// --------------------------------------------------------------- $time_start = microtime(true); // Record time // search using foreach function foreach ($arr as $key=>$val) { if($val === "1000") { echo "<br />Found"; } } // Display time $time_end = microtime(true); $time = $time_end - $time_start; //round($time_end - $time_start, 4); echo "<br />Time for FOREACH of array: {$time} seconds"; /// --------------------------------------------------------------- $time_start = microtime(true); // Record time // search using in_array function in_array("1000", $arr); // Display time $time_end = microtime(true); $time = $time_end - $time_start; //round($time_end - $time_start, 4); echo "<br />Time for in_array() of array: {$time} seconds"; clearstatcache(); /// --------------------------------------------------------------- $time_start = microtime(true); // Record time // search using in_array function array_search("1000", $arr); // Display time $time_end = microtime(true); $time = $time_end - $time_start; //round($time_end - $time_start, 4); echo "<br />Time for array_search() of array: {$time} seconds"; clearstatcache(); phpinfo(); ?> Output: Time for cretion of array: 0.2615659236908 seconds Time for FOREACH of array: 0.013147115707397 seconds Time for in_array() of array: 0.021516084671021 seconds Time for array_search() of array: 0.021377086639404 seconds Problem: Indigenous functions are supposed to be much faster than foreach or any external loop (this is what I read in the book Zend PHP 5 Certification Study Guide), but its twice slower here, -- Edit bug report at http://bugs.php.net/bug.php?id=53422&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=53422&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=53422&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=53422&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=53422&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53422&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=53422&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=53422&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=53422&r=needscript Try newer version: http://bugs.php.net/fix.php?id=53422&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=53422&r=support Expected behavior: http://bugs.php.net/fix.php?id=53422&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=53422&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=53422&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=53422&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53422&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=53422&r=dst IIS Stability: http://bugs.php.net/fix.php?id=53422&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=53422&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=53422&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=53422&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=53422&r=mysqlcfg