Online PHP editor | refs for BltNP

<?php function arraydiff(&$array1, &$array2) { $a1 = array_flip($array1); $a2 = array_flip($array2); $differences = array(); //what is in array 1 that is not in array2 $c = count($a1); foreach ($a1 as $k => $v) { if (!isset($a2[$k])) { $differences[] = $k; } } return $differences; } $i=0; $j=500000; while($i < 60000) { $i++; $j++; $data1[] = md5($i); $data2[] = md5($j); } $time = microtime(true); echo "Starting arraydiff\n"; $data_diff1 = arraydiff($data1, $data2); $time = microtime(true) - $time; echo 'arraydiff() took ' . number_format($time, 3) . ' seconds and returned ' . count($data_diff1) . " entries\n";