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<?php var_dump([ $original_set = [ 'arrayobject' => new arrayobject( [3] ), 'reference?' => [5] ], $original_serialized = serialize( $original_set ), $original_unserialized = unserialize( $original_serialized ), $withreference_serialized = preg_replace( '/a:1:{i:0;i:5;}}/', 'R:4;}', $original_serialized ), $withreference_unserialized = unserialize( $withreference_serialized ), $withreference_unserialized['reference?'][9] = 8, $referenced_arrayobject = & $withreference_unserialized['arrayobject'], $reference_array = & $withreference_unserialized['reference?'], $withreference_unserialized, ( ( $referenced_arrayobject[9] ) === ( $reference_array[9] ) ) ? 'looks like a reference' : 'does not look like a reference' , ]) ;
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object in /in/iAuOL:9 Stack trace: #0 [internal function]: ArrayObject->__unserialize(Array) #1 /in/iAuOL(9): unserialize('a:2:{s:11:"arra...') #2 {main} thrown in /in/iAuOL on line 9
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught InvalidArgumentException: Passed variable is not an array or object in /in/iAuOL:9 Stack trace: #0 [internal function]: ArrayObject->__unserialize(Array) #1 /in/iAuOL(9): unserialize('a:2:{s:11:"arra...') #2 {main} thrown in /in/iAuOL on line 9
Process exited with code 255.
Output for 7.3.32 - 7.3.33
array(10) { [0]=> array(2) { ["arrayobject"]=> object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [1]=> string(110) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";a:1:{i:0;i:5;}}" [2]=> array(2) { ["arrayobject"]=> object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [3]=> string(100) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";R:4;}" [4]=> array(2) { ["arrayobject"]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> NULL } [5]=> int(8) [6]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } [7]=> array(1) { [9]=> int(8) } [8]=> array(2) { ["arrayobject"]=> &object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> &array(1) { [9]=> int(8) } } [9]=> string(30) "does not look like a reference" }
Output for 7.3.16 - 7.3.31
Notice: Undefined offset: 9 in /in/iAuOL on line 16 array(10) { [0]=> array(2) { ["arrayobject"]=> object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [1]=> string(110) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";a:1:{i:0;i:5;}}" [2]=> array(2) { ["arrayobject"]=> object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [3]=> string(100) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";R:4;}" [4]=> array(2) { ["arrayobject"]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> NULL } [5]=> int(8) [6]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } [7]=> array(1) { [9]=> int(8) } [8]=> array(2) { ["arrayobject"]=> &object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> &array(1) { [9]=> int(8) } } [9]=> string(30) "does not look like a reference" }
Output for 7.1.10 - 7.1.20, 7.2.0 - 7.2.33
Notice: Undefined offset: 9 in /in/iAuOL on line 16 array(10) { [0]=> array(2) { ["arrayobject"]=> object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [1]=> string(110) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";a:1:{i:0;i:5;}}" [2]=> array(2) { ["arrayobject"]=> object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [3]=> string(100) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";R:4;}" [4]=> array(2) { ["arrayobject"]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(3) } } [5]=> int(8) [6]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } [7]=> array(2) { [0]=> int(3) [9]=> int(8) } [8]=> array(2) { ["arrayobject"]=> &object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> &array(2) { [0]=> int(3) [9]=> int(8) } } [9]=> string(30) "does not look like a reference" }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7

Process exited with code 139.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
array(10) { [0]=> array(2) { ["arrayobject"]=> object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [1]=> string(110) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";a:1:{i:0;i:5;}}" [2]=> array(2) { ["arrayobject"]=> object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(3) } } ["reference?"]=> array(1) { [0]=> int(5) } } [3]=> string(100) "a:2:{s:11:"arrayobject";C:11:"ArrayObject":29:{x:i:0;a:1:{i:0;i:3;};m:a:0:{}}s:10:"reference?";R:4;}" [4]=> array(2) { ["arrayobject"]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> &array(2) { [0]=> int(3) [9]=> int(8) } } ["reference?"]=> &array(2) { [0]=> int(3) [9]=> int(8) } } [5]=> int(8) [6]=> object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> &array(2) { [0]=> int(3) [9]=> int(8) } } [7]=> array(2) { [0]=> int(3) [9]=> int(8) } [8]=> array(2) { ["arrayobject"]=> &object(ArrayObject)#3 (1) { ["storage":"ArrayObject":private]=> &array(2) { [0]=> int(3) [9]=> int(8) } } ["reference?"]=> &array(2) { [0]=> int(3) [9]=> int(8) } } [9]=> string(22) "looks like a reference" }

preferences:
194.48 ms | 406 KiB | 226 Q