Bug #52732 [NEW]: Docs say preg_match() returns FALSE on error, but it returns int(0)

From: Date: Sun, 29 Aug 2010 17:42:25 +0000
Subject: Bug #52732 [NEW]: Docs say preg_match() returns FALSE on error, but it returns int(0)
Groups: php.bugs 
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From:             
Operating system: Any
PHP version:      5.3.3
Package:          PCRE related
Bug Type:         Bug
Bug description:Docs say preg_match() returns FALSE on error, but it returns int(0)

Description:
------------
The documentation states that preg_match() will return the number of
matches (0 or 
1) or bool(false) on error.  The latter doesn't happen—preg_match() is
returning 
int(0) when an error occurs.

Test script:
---------------
<?php
// Ensure we hit the backtrack limit
ini_set('pcre.backtrack_limit', 1);

// See http://us.php.net/preg_last_error
$ret = preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');

echo 'Return value is ';
var_dump($ret);

if ($ret === false) {
    echo '$ret is false; preg_last_error() says: ' . preg_last_error() .
"\n";
} else {
    echo '$ret is not false; preg_last_error() says: ' . preg_last_error()
. "\n";
}

Expected result:
----------------
Return value is bool(false)
$ret is false; preg_last_error() says: 2

Actual result:
--------------
Return value is int(0)
$ret is not false; preg_last_error() says: 2

-- 
Edit bug report at http://bugs.php.net/bug.php?id=52732&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=52732&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=52732&r=trysnapshot53
Try a snapshot (trunk):              http://bugs.php.net/fix.php?id=52732&r=trysnapshottrunk
Fixed in SVN:                        http://bugs.php.net/fix.php?id=52732&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52732&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=52732&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=52732&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=52732&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=52732&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=52732&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=52732&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=52732&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=52732&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=52732&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=52732&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=52732&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=52732&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=52732&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=52732&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=52732&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=52732&r=mysqlcfg

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