Online PHP editor | output for LYfu9

<?php function shitty_prng($bytes = 32) { $buf = ''; for ($i = 0; $i < $bytes; ++$i) { $buf .= chr(mt_rand(0, 255)); } } function better_prng($bytes = 32) { if (function_exists('mcrypt_create_iv')) { return mcrypt_create_iv(32, MCRYPT_DEV_URANDOM); } return openssl_random_pseudo_bytes(32); } function openssl_prng($bytes = 32) { return openssl_random_pseudo_bytes(32); } function mcrypt_prng($bytes = 32) { return mcrypt_create_iv(32, MCRYPT_DEV_URANDOM); } $buf = ''; $tests = []; $start = microtime(true); for ($i = 0; $i < 100000; ++$i) { $buf = shitty_prng(); } $tests['mtrand'] = ( microtime(true) - $start ); $start = microtime(true); for ($i = 0; $i < 100000; ++$i) { $buf = better_prng(); } $tests['csprng'] = ( microtime(true) - $start ); $start = microtime(true); for ($i = 0; $i < 100000; ++$i) { $buf = openssl_prng(); } $tests['openssl'] = ( microtime(true) - $start ); $start = microtime(true); for ($i = 0; $i < 100000; ++$i) { $buf = mcrypt_prng(); } $tests['mcrypt'] = ( microtime(true) - $start ); $start = microtime(true); for ($i = 0; $i < 100000; ++$i) { $buf = random_bytes(32); } $tests['php7'] = ( microtime(true) - $start ); var_dump($tests);