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@ 2020-11-05T21:13:11Z

<?php
class Test {
   public function callback() {}
   public function set(callable $callback) {}
}

$callback = ['Test', 'callback'];

var_dump(is_callable($callback)); // return FALSE

(new Test())->set($callback); // generate error
?>

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_callable: documentation ( source)

preferences:dark modelive preview

72.89 ms | 402 KiB | 5 Q