通过函数向数组添加多个值

Question

I'm trying to make a function which accepts a value and echo them in the end.

Here's an example:

function number_of_files ($name) {
    $name_of_files = array($name);
    var_dump ($name_of_files);
}

And I'm using this function as

number_of_files("file.png");
number_of_files("audio.mp3");

I'm expecting the following output:

  Array (
    [0] => file.png
    [1] => audio.mp3
)

Any suggestions why is it not working?

Answer 1

Nope. You are overwrite your $name_of_files every time. That variable in the functions scope.

Use this:

function number_of_files ($name, &$name_of_files) {
    array_push($name_of_files, $name);
}

$name_of_files = number_of_files('file.mpg', $name_of_files);
$name_of_files = number_of_files('audio.mp3', $name_of_files);
var_dump ($name_of_files);

Now you are using your array as a reference.

EDIT:

If you do not want to overwrite your original array, you can return:

function number_of_files ($name, $name_of_files) {
    array_push($name_of_files, $name);
    return $name_of_files;
}

But let's note, in the second case I did not used the & sign before the $name_of_files function argument. That is the reference marker.

You can read it here: http://php.net/manual/en/language.references.pass.php