Created
November 17, 2014 16:43
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<?php | |
if ( !function_exists('wp_rand') ) : | |
/** | |
* Generates a random number | |
* | |
* @since 2.6.2 | |
* | |
* @param int $min Lower limit for the generated number | |
* @param int $max Upper limit for the generated number | |
* @return int A random number between min and max | |
*/ | |
function wp_rand( $min = 0, $max = 0 ) { | |
global $rnd_value; | |
// Reset $rnd_value after 14 uses | |
// 32(md5) + 40(sha1) + 40(sha1) / 8 = 14 random numbers from $rnd_value | |
if ( strlen($rnd_value) < 8 ) { | |
if ( defined( 'WP_SETUP_CONFIG' ) ) | |
static $seed = ''; | |
else | |
$seed = get_transient('random_seed'); | |
$rnd_value = md5( uniqid(microtime() . mt_rand(), true ) . $seed ); | |
$rnd_value .= sha1($rnd_value); | |
$rnd_value .= sha1($rnd_value . $seed); | |
$seed = md5($seed . $rnd_value); | |
if ( ! defined( 'WP_SETUP_CONFIG' ) ) | |
set_transient('random_seed', $seed); | |
} | |
// Take the first 8 digits for our value | |
$value = substr($rnd_value, 0, 8); | |
// Strip the first eight, leaving the remainder for the next call to wp_rand(). | |
$rnd_value = substr($rnd_value, 8); | |
$value = abs(hexdec($value)); | |
// Some misconfigured 32bit environments (Entropy PHP, for example) truncate integers larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats. | |
$max_random_number = 3000000000 === 2147483647 ? (float) "4294967295" : 4294967295; // 4294967295 = 0xffffffff | |
// Reduce the value to be within the min - max range | |
if ( $max != 0 ) | |
$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 ); | |
return abs(intval($value)); | |
} | |
endif; |
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