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wp_rand › WordPress Function
Since2.6.2
Deprecatedn/a
› wp_rand ( $min = null, $max = null )
| Parameters: (2) |
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| Returns: |
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| Defined at: |
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| Codex: | |
| Change Log: |
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Generates a random non-negative number.
Source
function wp_rand( $min = null, $max = null ) {
global $rnd_value;
/*
* Some misconfigured 32-bit 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
if ( null === $min ) {
$min = 0;
}
if ( null === $max ) {
$max = $max_random_number;
}
// 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 {
// 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.
$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );
return abs( (int) $value );
}
endif;
if ( ! function_exists( 'wp_set_password' ) ) :
/**
* Updates the user's password with a new hashed one.
*
* For integration with other applications, this function can be overwritten to
* instead use the other package password checking algorithm.
*
* Please note: This function should be used sparingly and is really only meant for single-time
* application. Leveraging this improperly in a plugin or theme could result in an endless loop
* of password resets if precautions are not taken to ensure it does not execute on every page load.
*
* @since 2.5.0
* @since 6.8.0 The password is now hashed using bcrypt by default instead of phpass.
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $password The plaintext new user password.
* @param int $user_id User ID.
*/