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<?php function sum($a) { return new Sum($a); } class Sum { protected $value; public function __construct($value) { $this->value = $value; } public function __invoke($a) { return new static($this->value + $a); } public function __toString() { return $this->value; } } echo sum(1)(2)(3)(4)(5); //10
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
15
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Method Sum::__toString() must return a string value in /in/VBDS1:28 Stack trace: #0 {main} thrown in /in/VBDS1 on line 28
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Recoverable fatal error: Method Sum::__toString() must return a string value in /in/VBDS1 on line 28
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Catchable fatal error: Method Sum::__toString() must return a string value in /in/VBDS1 on line 28
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '(', expecting ',' or ';' in /in/VBDS1 on line 28
Process exited with code 255.
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