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run code in 150+ php & hhvm versions
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<?php $string1 = 'aaaaaaaaaaaaaaaaaaaa'; $string2 = 'bbbbbbbbbbbbbbbbbbbb'; $string3 = 'cccccccccccccccccccc'; $string4 = 'dddddddddddddddddddd'; $string5 = 'eeeeeeeeeeeeeeeeeeee'; $results = array(); $time1 = microtime(true); for ($i = 0; $i<1000000; $i++) { $concatTest1 = $string1 . $string2 . $string3 . $string4 . $string5; } unset($i); $time2 = microtime(true); $testDuration1 = $time2 - $time1; $results['Test1'] = $testDuration1; $time3 = microtime(true); for ($i = 0; $i<1000000; $i++) { $concatTest2 = "{$string1}{$string2}{$string3}{$string4}{$string5}"; } unset($i); $time4 = microtime(true); $testDuration2 = $time4 - $time3; $results['Test2'] = $testDuration2; $time5 = microtime(true); for ($i = 0; $i<1000000; $i++) { $concatTest3 = implode('', array( $string1, $string2, $string3, $string4, $string5 )); } unset($i); $time6 = microtime(true); $testDuration3 = $time6 - $time5; $results['Test3'] = $testDuration3;
Output for 4.3.0 - 7.1.0