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<?php $notifications = array(); function add($type){ global $notifications; $notify = array( 'text' => '11' , 'link' => '22' ); if ( $notifications && count($notifications[$type]) && count($notifications[$type]) <= 4 ) { array_unshift($notifications[$type], $notify); } elseif ( $notifications && count($notifications[$type]) > 4 ) { array_pop($notifications[$type]); array_unshift($notifications[$type], $notify); } else { $notifications[$type] = []; array_unshift($notifications[$type], $notify); } } for($i = 0; $i< 5; $i++){ add($i); var_dump($notifications); }
Output for 8.0.10 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(1) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Warning: Undefined array key 1 in /in/631n7 on line 11 Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /in/631n7:11 Stack trace: #0 /in/631n7(34): add(1) #1 {main} thrown in /in/631n7 on line 11
Process exited with code 255.
Output for 8.0.0 - 8.0.9
array(1) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Warning: Undefined array key 1 in /in/631n7 on line 11 Fatal error: Uncaught TypeError: count(): Argument #1 ($var) must be of type Countable|array, null given in /in/631n7:11 Stack trace: #0 /in/631n7(34): add(1) #1 {main} thrown in /in/631n7 on line 11
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
array(1) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 1 in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Notice: Undefined offset: 1 in /in/631n7 on line 16 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(2) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 2 in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Notice: Undefined offset: 2 in /in/631n7 on line 16 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(3) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 3 in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Notice: Undefined offset: 3 in /in/631n7 on line 16 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(4) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [3]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 4 in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Notice: Undefined offset: 4 in /in/631n7 on line 16 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(5) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [3]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [4]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } }
Output for 7.3.32 - 7.3.33
array(1) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(2) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(3) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(4) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [3]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 11 Warning: count(): Parameter must be an array or an object that implements Countable in /in/631n7 on line 16 array(5) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [3]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [4]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
array(1) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 1 in /in/631n7 on line 11 Notice: Undefined offset: 1 in /in/631n7 on line 16 array(2) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 2 in /in/631n7 on line 11 Notice: Undefined offset: 2 in /in/631n7 on line 16 array(3) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 3 in /in/631n7 on line 11 Notice: Undefined offset: 3 in /in/631n7 on line 16 array(4) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [3]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } } Notice: Undefined offset: 4 in /in/631n7 on line 11 Notice: Undefined offset: 4 in /in/631n7 on line 16 array(5) { [0]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [1]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [2]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [3]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } [4]=> array(1) { [0]=> array(2) { ["text"]=> string(2) "11" ["link"]=> string(2) "22" } } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/631n7 on line 24
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/631n7 on line 24
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/631n7 on line 24
Process exited with code 255.

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