What are the three points of the php method?

In php, three dots represent a variable number of parameter lists. In PHP 5.6 and above, it is implemented by... syntax, while in PHP 5.5 and earlier versions, it is used Implemented by the functions func_num_args(), func_get_arg() and func_get_args().

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

What are the three points of the php method?

php Usage of three dots

Explanation: Variable number of parameter lists

In PHP 5.6 and above, it is implemented by... Syntax ;In PHP 5.5 and earlier versions, use the functions func_num_args(), func_get_arg(), and func_get_args() to implement

Official documentation: https://www.php.net/manual/zh/functions. arguments.php#functions.variable-arg-list

Case:

<?php
function sum(...$numbers) {
    $acc = 0;
    foreach ($numbers as $n) {
        $acc += $n;
    }
    return $acc;
}
echo sum(1, 2, 3, 4);
?>

Output of the above case: 10

<?php
function add($a, $b) {
    return $a + $b;
}
echo add(...[1, 2])."\n";
$a = [1, 2];
echo add(...$a);
?>

Output of the above case: 3 3 (The result is the same, two 3)

Summary: This function accepts a variable number of parameters. The parameters will be passed to the given variables as an array

Recommended learning: "PHP Video Tutorial"

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