How many return values ​​can a php function have?

php function can only have one return value. In PHP, the function return value is defined using the return statement, with the syntax "return return value;". The return statement can only return one parameter, that is, the function can only have one return value; if you want to return multiple values, you need to define an array in the function, store the return value in the array, and return it.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

The return value of the php function can only be one.

A function is a collection of functions that can implement certain specific functions or operations. It makes no sense to keep the result after the function is run inside the function, so we need to return the result of the function to the place where the function is called.

PHP provides the return statement to return the running result of the function. Its syntax format is as follows:

return 返回值;

Among them, the "return value" is an optional parameter, which can be a specific value or Expression can also be empty. The "return value" and the return keyword need to be separated by a space.

<?php
function square($num){
    return $num * $num;
}
echo square(4);  //outputs&#39;16&#39;.
?>

The running result of the above code is:

16

Note: The function can only have one return value.

#The return statement can only return one parameter, that is, it can only return one value, and cannot return multiple values ​​at one time. If you want to return multiple values, you need to define an array in the function, store the return value in the array and return it.

You need to pay attention to the following points when using the return statement:

• The return statement is used to return a value to the "caller of the function". After returning the value, immediately End the function running, so the return statement is generally placed at the end of the function;

• If there are multiple return statements in a function, only the first one will be executed;

• The return statement can also return no parameters, which is equivalent to ending the function running;

• If the return statement is used in the global scope, the currently running function will be terminated immediately. Script;

• If the script file introduced using include or require contains a return statement, it will return to the place where the script was introduced and continue to execute downwards, and other codes after return will not be executed.

[Example] The following implements a function that calculates the exchange rate, and returns the calculated value through return. The code is as follows:

<?php
    function money($rmb, $rate=0.1438){
        $price = $rmb * $rate;
        return $price;
    }
    $dollar = money(50);
    echo &#39;50 元人民币 = &#39;.$dollar.&#39; 美元&#39;;
?>

The running results are as follows:

50 元人民币 = 7.19 美元

Tip: In the above example, we used return in the function to return a variable $price. In fact, what is returned is not the variable itself, but the value of this variable. So outside the function we need to use another variable to store this value.

Through the above introduction, we know that return can only return one parameter at a time. If you want to return multiple parameters, you need to use an array to complete it. Let's demonstrate it through an example:

<?php
function small_numbers(){
    return array(0, 1, 2);
}
list($zero, $one, $two) = small_numbers();
echo $zero . $one . $two;
?>

Code The execution result is:

012

$zero $one $two The values ​​are 0, 1, and 2 respectively.

Recommended learning: "PHP Video Tutorial"

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