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Bug #42177 Warning "array_merge_recursive(): recursion detected" comes again...
Submitted: 2007-08-02 12:24 UTC Modified: 2008-03-12 19:22 UTC
Votes:5
Avg. Score:4.6 ± 0.8
Reproduced:4 of 4 (100.0%)
Same Version:1 (25.0%)
Same OS:2 (50.0%)
From: rl at ez dot no Assigned:
Status: Closed Package: Arrays related
PHP Version: 4.4.7 OS: linux mandriva 2006
Private report: No CVE-ID: None
View Developer Edit
 [2007-08-02 12:24 UTC] rl at ez dot no 
Description:
------------
Just run the code below and please answer the question:
Why those marked as 'warning' generate warning "array_merge_recursive(): recursion detected" while others marked as 'clear' do not?

<?

// clear
echo "<br>example 1";
$a1 = array( 'a' => 1, 'b' => 2 );
$az = array_merge_recursive( $a1, $a1 );
unset( $a1, $a2 );

// clear
echo "<br>example 2";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = $a1;
$az = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// clear
echo "<br>example 3";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$az = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// warning
echo "<br>example 4";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$a3 = $a1;
$az = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// warning
echo "<br>example 5";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$a3 = $a2;
$az = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// warning
echo "<br>example 6";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = $a1;
$a2[] = 3; // $a2['c'] = 3; - no matter, warning anyway
$az = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// clear
echo "<br>example 7";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$a2[] = 3;
$az = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// warning
echo "<br>example 8";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$a3 = $a2;
$az = array_merge_recursive( $a1, $a3 );
unset( $a1, $a2, $a3 );

// warning
echo "<br>example 9";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = $a1;
$a3 = & $a2;
$az = array_merge_recursive( $a1, $a3 );
unset( $a1, $a2, $a3 );

// clear
echo "<br>example 10";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$a3 = & $a2;
$az = array_merge_recursive( $a1, $a3 );
unset( $a1, $a2, $a3 );

// warning
echo "<br>example 11";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = $a1;
$a3 = $a2;
$a3[] = 3;
$az = array_merge_recursive( $a1, $a3 );
unset( $a1, $a2, $a3 );

// clear
echo "<br>example 12";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = & $a1;
$a3 = & $a2;
$a3[] = 3;
$az = array_merge_recursive( $a1, $a3 );
unset( $a1, $a2, $a3 );

?>

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 [2007-08-02 14:33 UTC] rl at ez dot no 
let's continue

// clear
echo "<br>example 13";
$a1 = array( 'key1' => 1, 'key3' => 2 );
$a2 = array();
$a1 = array_merge_recursive( $a1, $a2 );
$a1 = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

// warning
echo "<br>example 14";
$a1 = array();
$a2 = array( 'key1' => 1, 'key3' => 2 );
$a1 = array_merge_recursive( $a1, $a2 );
$a1 = array_merge_recursive( $a1, $a2 );
unset( $a1, $a2 );

why does example 14 generate a warning while example 13 does not?
seems like if first parameter is empty then function array_merge_recursive just assigns first parameter variable to the second one and makes some internal marks about two arrays which point on the same data but actually are different for a enduser. but second call of array_merge_recursive does not know anything about it.
or something like that... no matter, but these warnings are definitely incorrect.
 [2008-03-12 19:22 UTC] felipe@php.net 
This bug has been fixed in CVS.

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