How can one determine if a parameter in a function like addChild() or a constructor like clsLiteral expects a reference in PHP?

When determining if a parameter in a function or constructor expects a reference in PHP, you can refer to the function or constructor definition in the PHP documentation. Look for any indication that the parameter should be passed by reference, such as using the "&" symbol before the parameter name. Additionally, you can check if the function or constructor modifies the parameter directly, which is a common indication that it expects a reference. 

// Example code snippet showing how to pass a parameter by reference in PHP

class MyClass {
    private $data;

    public function __construct(&$data) {
        $this->data = $data;
    }

    public function addChild(&$child) {
        // Add child logic here
    }
}

$data = 'example';
$myClass = new MyClass($data);

$child = 'child';
$myClass->addChild($child);

Keywords

PHP function parameters reference addChild() clsLiteral

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