is_callable

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Supported Versions: PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8
Verify that a value can be called as a function from the current scope.
<?php is_callable(mixed $value, bool $syntax_only = false, string &$callable_name = null): bool
<?php     public static function wrapCallable($callable)

    {

        if (\is_object($callable) || !\is_callable($callable)) {

            return $callable;

        }
Caster/ClassStub.php 
<?php     {

        $prev = $this->outputStream ?? $this->lineDumper;



        if (\is_callable($output)) {

            $this->outputStream = null;

            $this->lineDumper = $output;

        } else {
Dumper/AbstractDumper.php