Bug #68110 [Opn]: undefined variable error not being triggered for undefined array index

Edit report at https://bugs.php.net/bug.php?id=68110&edit=1

 ID:                 68110
 User updated by:    mathiasgrimm at gmail dot com
 Reported by:        mathiasgrimm at gmail dot com
 Summary:            undefined variable error not being triggered for
                     undefined array index
 Status:             Open
 Type:               Bug
 Package:            PHP Language Specification
 Operating System:   OSX, Windows, Linux
-PHP Version:        5.5.17
+PHP Version:        5.5, 5.4
 Block user comment: N
 Private report:     N

 New Comment:

Discovered this problem when using the @ sign to suppress errors when trying to access an undefined array index and checking the $php_errormsg but for my surprise that never happens if the assigned value is NULL... and according to the documentation this should happen.

I was implementing an array_key_exist_recursive ...


public static function exists($mIndex, $aSource)
    {
        $aPath   = explode(self::$sSeparator, $mIndex);
        $sEval   = "\$bExists = @\$aSource['" . implode("']['", $aPath) . "'];";
        
        eval($sEval);        
        
        return !isset($php_errormsg);
    }


Previous Comments:
------------------------------------------------------------------------
[2014-09-26 21:25:29] mathiasgrimm at gmail dot com

actually the expected result is Undefined index: b... or to have the variable $php_errormsg defined.

------------------------------------------------------------------------
[2014-09-26 21:24:03] mathiasgrimm at gmail dot com

Description:
------------
according to the manual(http://ie1.php.net/manual/en/language.types.array.php):

Note:
Attempting to access an array key which has not been defined is the same as accessing any other undefined variable: an E_NOTICE-level error message will be issued, and the result will be NULL.



Test script:
---------------
        $a ['a'] = null;
        

        $tmp = $a['a']['b']; // nothing
        $tmp = $a['a']['b']['c']; // nothing

// this works (throw an E_NOTICE) fine
$a ['a'] = array();
$tmp = $a['a']['b']; // Undefined index: b
$tmp = $a['a']['b']['c']; // Undefined index: b


Expected result:
----------------
assert(isset($php_errormsg) === true);

Actual result:
--------------
Undefined index: b


------------------------------------------------------------------------



--
Edit this bug report at https://bugs.php.net/bug.php?id=68110&edit=1