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run code in 300+ PHP versions simultaneously
<?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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1

preferences:
230.64 ms | 404 KiB | 325 Q