<?php
$randoms = mt_rand(0, 999999);
$random_string = sha1($randoms);
/* or */
$randomy = file_get_contents('/dev/urandom', false, null, 0, 10);
/* or */
$string_p = bin2hex($randoms);
$numbered = current(unpack('L', $randoms));
/* or */
$randomly = mcrypt_create_iv(10, MCRYPT_DEV_URANDOM);
/* or */
$salty = mcrypt_create_iv(10, MCRYPT_DEV_URANDOM);
$salty = base64_encode($salty);
$salty = str_replace('+', '.', $salty);
$hasho = crypt('likeApassword', '$2y$10$' . $salty . '$');
So much randomness in this, that math is literally the fastest way to do it. I like HEX, but that's just because it doesn't make me spell past F. ;) Have fun!
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