How to Pass an Array as Arguments to a Function in PHP?

Passing an Array as Arguments, Not an Array

In PHP, there are ways to pass an array as a list of arguments to a function. This can be achieved using the spread operator (...) or call_user_func_array(). Let's explore the methods:

Spread Operator (Introduced in PHP 5.6)

The spread operator, also known as the "splat operator," is a concise and performant way to unpack an array as arguments.

function variadic(...$args) {
    echo implode(' ', $args);
}

$array = ['Hello', 'World'];

// Splatting the $array
variadic(...$array); // Output: 'Hello World'

Note that indexed array items are mapped to arguments based on their position, not keys.

call_user_func_array()

call_user_func_array() is a less efficient but still useful method for passing an array as arguments.

function variadic($arg1, $arg2) {
    echo $arg1 . ' ' . $arg2;
}

$array = ['Hello', 'World'];

// Using call_user_func_array()
call_user_func_array('variadic', $array); // Output: 'Hello World'

In PHP 8, you can leverage named arguments when using the spread operator with associative arrays:

function variadic(string $arg2, string $arg1) {
    echo $arg1 . ' ' . $arg2;
}

$array = ['arg2' => 'Hello', 'arg1' => 'World'];

variadic(...$array); // Output: 'World Hello'

The spread operator is the recommended method due to its superior performance and convenience.

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