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<?php class Base { protected $quadrat; } class Test extends Base { public function malzwei($n) { return $n * 2; } public function quadrat($n) { return $n * $n; } public function getQuadrat() { echo is_callable($this->quadrat) ? 'Yes' : 'No'; echo "\n"; return $this->quadrat; } } $t = new Test(); $quadrat = $t->getQuadrat(); echo gettype($quadrat); echo call_user_func($quadrat, 3); var_dump(array_map($quadrat, array(1, 2, 3, 4)));
Output for git.master, git.master_jit, rfc.property-hooks
No NULL Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, no array or string given in /in/PP5gf:14 Stack trace: #0 {main} thrown in /in/PP5gf on line 14
Process exited with code 255.

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