Created
October 6, 2015 14:15
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Random, unique, alphanumeric string with defined length
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function crypto_rand_secure($min, $max) | |
{ | |
$range = $max - $min; | |
if ($range < 1) return $min; // not so random... | |
$log = ceil(log($range, 2)); | |
$bytes = (int) ($log / 8) + 1; // length in bytes | |
$bits = (int) $log + 1; // length in bits | |
$filter = (int) (1 << $bits) - 1; // set all lower bits to 1 | |
do { | |
$rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes))); | |
$rnd = $rnd & $filter; // discard irrelevant bits | |
} while ($rnd >= $range); | |
return $min + $rnd; | |
} | |
function getToken($length) | |
{ | |
$token = ""; | |
$codeAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
$codeAlphabet.= "abcdefghijklmnopqrstuvwxyz"; | |
$codeAlphabet.= "0123456789"; | |
$max = strlen($codeAlphabet) - 1; | |
for ($i=0; $i < $length; $i++) { | |
$token .= $codeAlphabet[crypto_rand_secure(0, $max)]; | |
} | |
return $token; | |
} | |
//from http://stackoverflow.com/a/13733588/1550485 |
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