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run code in 150+ php & hhvm versions
Bugs & Features
<?php $names = ['Alice', 'Bob', 'Charlie', 'Alice', 'Dave', 'Alice']; class Name { public $name; public $id; public function __construct($name, $id = 0) { $this->name = $name; $this->id = $id; } } function is_similar($a, $b) { return $a->name == $b->name; } function contains(array $list, $item, callable $comparitor) { foreach ($list as $test) { if ($comparitor($item, $test)) { return true; } } return false; } function partial($func, $arg1) { $func_args = func_get_args(); $args = array_slice($func_args, 1); return function() use($func, $args) { $full_args = array_merge($args, func_get_args()); return call_user_func_array($func, $full_args); }; } // Transform strings -> objects $mappedNames = array_map(function($name) { return new Name($name); }, $names); // Deduplicate list $reduction = function(callable $comparitor, array $carry, $item) { if (contains($carry, $item, $comparitor)) { return $carry; } return array_merge($carry, array($item)); }; $reducedNames = array_reduce($mappedNames, partial($reduction, "is_similar"), []); $idNames = array_map(function($item, $id) { return new Name($item->name, $id); }, $reducedNames, range(1, count($reducedNames))); var_dump($idNames);
Output for 5.4.0 - 7.1.0
array(4) { [0]=> object(Name)#9 (2) { ["name"]=> string(5) "Alice" ["id"]=> int(1) } [1]=> object(Name)#10 (2) { ["name"]=> string(3) "Bob" ["id"]=> int(2) } [2]=> object(Name)#11 (2) { ["name"]=> string(7) "Charlie" ["id"]=> int(3) } [3]=> object(Name)#12 (2) { ["name"]=> string(4) "Dave" ["id"]=> int(4) } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/um2Ge on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/um2Ge on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/um2Ge on line 3
Process exited with code 255.