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<?php class ToStringMadness { private $data; public function __construct($data) { $this->data = $data; } public function __toString() { //$data = array_map(function($item) { return $item; }, $this->data); $data = array_merge($data); sort($data); $rs = implode('-', $data); echo $rs."\n"; return $rs; } } $a = [ new ToStringMadness(['c','b']), new ToStringMadness(['c','b','a']), new ToStringMadness(['a','b']), ]; sort($a); print_r($a); usort($a, function(ToStringMadness $itemA, ToStringMadness $itemB) { return strcmp((string)$itemA, (string)$itemB); }); print_r($a);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Warning: Undefined variable $data in /in/F7evU on line 12 Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/F7evU:12 Stack trace: #0 /in/F7evU(12): array_merge(NULL) #1 /in/F7evU(32): ToStringMadness->__toString() #2 [internal function]: {closure}(Object(ToStringMadness), Object(ToStringMadness)) #3 /in/F7evU(31): usort(Array, Object(Closure)) #4 {main} thrown in /in/F7evU on line 12
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Warning: Undefined variable $data in /in/F7evU on line 12 Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/F7evU:12 Stack trace: #0 /in/F7evU(12): array_merge(NULL) #1 /in/F7evU(32): ToStringMadness->__toString() #2 [internal function]: {closure}(Object(ToStringMadness), Object(ToStringMadness)) #3 /in/F7evU(33): usort(Array, Object(Closure)) #4 {main} thrown in /in/F7evU on line 12
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Notice: Undefined variable: data in /in/F7evU on line 12 Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/F7evU on line 12 Warning: sort() expects parameter 1 to be array, null given in /in/F7evU on line 13 Warning: implode(): Invalid arguments passed in /in/F7evU on line 14 Fatal error: Uncaught Error: Method ToStringMadness::__toString() must return a string value in /in/F7evU:32 Stack trace: #0 [internal function]: {closure}(Object(ToStringMadness), Object(ToStringMadness)) #1 /in/F7evU(33): usort(Array, Object(Closure)) #2 {main} thrown in /in/F7evU on line 32
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/F7evU on line 12 Warning: sort() expects parameter 1 to be array, null given in /in/F7evU on line 13 Warning: implode(): Invalid arguments passed in /in/F7evU on line 14 Recoverable fatal error: Method ToStringMadness::__toString() must return a string value in /in/F7evU on line 32
Process exited with code 255.
Output for 7.3.0 - 7.3.31
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Notice: Undefined variable: data in /in/F7evU on line 12 Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/F7evU on line 12 Warning: sort() expects parameter 1 to be array, null given in /in/F7evU on line 13 Warning: implode(): Invalid arguments passed in /in/F7evU on line 14 Recoverable fatal error: Method ToStringMadness::__toString() must return a string value in /in/F7evU on line 32
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Notice: Undefined variable: data in /in/F7evU on line 12 Warning: array_merge(): Argument #1 is not an array in /in/F7evU on line 12 Warning: sort() expects parameter 1 to be array, null given in /in/F7evU on line 13 Warning: implode(): Invalid arguments passed in /in/F7evU on line 14 Recoverable fatal error: Method ToStringMadness::__toString() must return a string value in /in/F7evU on line 32
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Array ( [0] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => a [1] => b ) ) [1] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b ) ) [2] => ToStringMadness Object ( [data:ToStringMadness:private] => Array ( [0] => c [1] => b [2] => a ) ) ) Notice: Undefined variable: data in /in/F7evU on line 12 Warning: array_merge(): Argument #1 is not an array in /in/F7evU on line 12 Warning: sort() expects parameter 1 to be array, null given in /in/F7evU on line 13 Warning: implode(): Invalid arguments passed in /in/F7evU on line 14 Catchable fatal error: Method ToStringMadness::__toString() must return a string value in /in/F7evU on line 32
Process exited with code 255.

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