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General: Ensure wp_rand() returns 0 when $min and $max values are equal to 0.

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This changeset ensures `wp_rand()` returns zero instead of a random number when both `$min` and `$max` values are equal to zero.

Fixes #55194.


git-svn-id: https://develop.svn.wordpress.org/trunk@53473 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Jb Audras
2022-06-06 22:48:21 +00:00
parent d9c7980834
commit a147212892
2 changed files with 113 additions and 11 deletions
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src/wp-includes/pluggable.php
+17 -9
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@@ -2596,20 +2596,31 @@ if ( ! function_exists( 'wp_rand' ) ) :
*
* @since 2.6.2
* @since 4.4.0 Uses PHP7 random_int() or the random_compat library if available.
* @since 6.1.0 Returns zero instead of a random number if both `$min` and `$max` are zero.
*
* @global string $rnd_value
*
* @param int $min Lower limit for the generated number.
* @param int $max Upper limit for the generated number.
* @param int $min Optional. Lower limit for the generated number.
* Accepts positive integers or zero. Defaults to 0.
* @param int $max Optional. Upper limit for the generated number.
* Accepts positive integers. Defaults to 4294967295.
* @return int A random number between min and max.
*/
function wp_rand( $min = 0, $max = 0 ) {
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;
@@ -2618,10 +2629,9 @@ if ( ! function_exists( 'wp_rand' ) ) :
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 );
$_max = max( $min, $max );
$_min = min( $min, $max );
$val = random_int( $_min, $_max );
if ( false !== $val ) {
return absint( $val );
@@ -2661,9 +2671,7 @@ if ( ! function_exists( 'wp_rand' ) ) :
$value = abs( hexdec( $value ) );
// Reduce the value to be within the min - max range.
if ( 0 != $max ) {
$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );
}
$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );
return abs( (int) $value );
}