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<?php function max_by($collection, $property) { $plucked = array_map(function ($item) use ($property) { return $item->$property; }, $collection); return max($plucked); } class A { function __construct($u,$v) { $this->u = $u; $this->v = $v; } } $array = [ new A(1,5), new A(2,2), new A(3,1) ]; $a = max_by($array, 'u'); $b = max_by($array, 'v'); var_dump($a, $b);
Output for 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
Deprecated: Creation of dynamic property A::$u is deprecated in /in/u26tp on line 12 Deprecated: Creation of dynamic property A::$v is deprecated in /in/u26tp on line 13 Deprecated: Creation of dynamic property A::$u is deprecated in /in/u26tp on line 12 Deprecated: Creation of dynamic property A::$v is deprecated in /in/u26tp on line 13 Deprecated: Creation of dynamic property A::$u is deprecated in /in/u26tp on line 12 Deprecated: Creation of dynamic property A::$v is deprecated in /in/u26tp on line 13 int(3) int(5)
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, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29
int(3) int(5)
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/u26tp on line 17
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/u26tp on line 4
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 T_FUNCTION, expecting ')' in /in/u26tp on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/u26tp on line 4
Process exited with code 255.

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