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<?php $i=0; $j=500000; while($i < 600000) { $i++; $j++; $data1[] = md5($i); $data2[] = md5($j); } $time = microtime(true); echo "Starting array_diff\n"; $data_diff1 = array_diff($data1, $data2); $time = microtime(true) - $time; echo 'array_diff() took ' . number_format($time, 3) . ' seconds and returned ' . count($data_diff1) . " entries\n";
Output for 7.1.21 - 7.1.22, 7.2.10

Process exited with code 137.
Output for 5.6.38
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 32 bytes) in /in/p5apB on line 6
Process exited with code 255.
preferences:
48.33 ms | 400 KiB | 9 Q