Defined (1)

The function is defined in the following location(s).

/wp-includes/pluggable.php  

function wp_rand( $min = 0, $max = 0 ) { 
    global $rnd_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 
 
    // We only handle Ints, floats are truncated to their integer value. 
    $min = (int) $min; 
    $max = (int) $max; 
 
    // Use PHP's CSPRNG, or a compatible method 
    static $use_random_int_functionality = true; 
    if ( $use_random_int_functionality ) { 
        try { 
            $_max = ( 0 != $max ) ? $max : $max_random_number; 
            // wp_rand() can accept arguments in either order, PHP cannot. 
            $_max = max( $min, $_max ); 
            $_min = min( $min, $_max ); 
            $val = random_int( $_min, $_max ); 
            if ( false !== $val ) { 
                return absint( $val ); 
            } else { 
                $use_random_int_functionality = false; 
            } 
        } catch ( Error $e ) { 
            $use_random_int_functionality = false; 
        } catch ( Exception $e ) { 
            $use_random_int_functionality = false; 
        } 
    } 
 
    // 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' ) && ! defined( 'WP_INSTALLING' ) ) { 
            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)); 
 
    // 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)); 
}