How can ReflectionFunction be used to work with Closure objects in PHP?

ReflectionFunction can be used to work with Closure objects in PHP by allowing you to inspect the properties and parameters of the Closure. This can be useful for debugging or dynamically analyzing the code within the Closure. By using ReflectionFunction, you can access information such as the number of parameters, the parameter names, and the source code of the Closure. 

$closure = function($x, $y) {
    return $x + $y;
};

$reflection = new ReflectionFunction($closure);

echo 'Number of parameters: ' . $reflection->getNumberOfParameters() . PHP_EOL;
echo 'Parameter names: ' . implode(', ', array_map(function($param) {
    return $param->getName();
}, $reflection->getParameters())) . PHP_EOL;
echo 'Source code: ' . $reflection->getFileName() . ':' . $reflection->getStartLine() . PHP_EOL;

Keywords

ReflectionFunction Closure objects PHP reflection introspection

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