wp_rand() – Generates a random non-negative number.
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Description
Generates a random non-negative number.
Usage
$int = wp_rand( $min, $max );
Parameters
- $min
- ( int ) optional – Optional. Lower limit for the generated number. Accepts positive integers or zero. Defaults to 0.
- $max
- ( int ) optional – Optional. Upper limit for the generated number. Accepts positive integers. Defaults to 4294967295.
Returns
int A random non-negative number between min and max.
Source
File name: wordpress/wp-includes/pluggable.php
Lines:
1 to 69 of 69
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 ); }