Describe in detail several commonly used implementation methods

In the process of programming, we sometimes need functions or methods to return multiple variable values. In PHP language, how to implement a method to return multiple parameters? This article will detail several common implementation methods.

Method 1: By returning an array

First of all, the most common implementation method is to use an array to store multiple parameters that need to be returned, and then return the array to the caller. For example, we want to calculate the sum and product of two numbers, the code is as follows:

function AddAndMultiply($a, $b) {
    $sum = $a + $b;
    $product = $a * $b;
    $result = array($sum, $product);
    return $result;
}

The statement to call this function is as follows:

$values = AddAndMultiply(3, 4);
echo "Sum: " . $values[0] . " Product: " . $values[1];

Method 2: By referencing variables

Secondly , you can modify the passed variable value inside the function by referencing the variable. In this way, all modified variable values ​​will be "returned" together. For example:

function AddAndMultiply($a, $b, &$sum, &$product) {
    $sum = $a + $b;
    $product = $a * $b;
}

The statement to use this function is as follows:

$sum = 0;
$product = 0;
AddAndMultiply(3,4,$sum,$product);
echo "Sum: " . $sum . " Product: " . $product;

It should be noted that when using reference variables, you need to add the "&" symbol in the parameter definition, as shown in the above code snippet "&$sum" and "&$product" in .

Method 3: By returning the object

In addition, you can also use objects to return multiple parameters. This method is relatively more troublesome to use, but it can better control the data type and format of the return value. The code example is as follows:

class MathResult {
    public $sum;
    public $product;
}
function AddAndMultiply($a, $b) {
    $result = new MathResult();
    $result->sum = $a + $b;
    $result->product = $a * $b;
    return $result;
}

The statement to call this function is as follows:

$result = AddAndMultiply(3,4);
echo "Sum: " . $result->sum . " Product: " . $result->product;

The above is how the three PHP methods return multiple parameters. Different scenarios and requirements require different implementation methods, and developers can choose the appropriate method according to the actual situation.

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