How Can I Dynamically Invoke Functions and Methods in PHP?

Dynamic Function Invocation from Variable

In PHP, invoking a function dynamically based on a value stored in a variable is an essential technique for creating versatile and modular applications.

To execute a function whose name is held in a string, you can use the following methods:

• $functionName(): This syntax invokes the function directly using the variable containing the function name.
• **call_user_func($functionName)**: This alternative provides the same functionality as $functionName(), offering a level of abstraction.

Dynamic Function Invocation with Parameters

If you need to pass parameters to the dynamic function, you can use the array unpacking operator:

$function_name = 'trim';
$parameters = ['aaabbb', 'b'];
echo $function_name(...$parameters); // aaa

Dynamic Object and Method Invocation

Dynamically creating an object and invoking its method:

$class = 'DateTime';
$method = 'format';
echo (new $class)->$method('d-m-Y');

Dynamic Static Method Invocation

To call a static method dynamically:

$class = 'DateTime';
$static = 'createFromFormat';
$date = $class::$static('d-m-Y', '17-08-2023');

These techniques empower you to achieve greater flexibility and code reusability in your PHP applications.

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