Online PHP editor | refs for 9retJ

<?php $starttime = microtime(true); $sArr = array(); for ($i = 0; $i < 30000; $i++) { $sArr[] = 'String concatenation. ' . $i; } $str = implode('', $sArr); $x = md5($str); $endtime = microtime(true); print "array append & implode: " . ($endtime - $starttime) . " s\n" ; // standard string append $starttime = microtime(true); $str = ''; for ($i = 0; $i < 30000; $i++) { $str .= 'String concatenation. ' . $i; } $x = md5($str); unset($str); $endtime = microtime(true); print "string concat: " . ($endtime - $starttime) . " s\n" ; $starttime = microtime(true); $sArr = array(); for ($i = 0; $i < 30000; $i++) { $sArr[] = 'String concatenation. ' . $i; } $str = implode('', $sArr); $x = md5($str); $endtime = microtime(true); print "array append & implode: " . ($endtime - $starttime) . " s\n" ;