我希望能够使用函数向称为播放列表的数组添加新值(是必需的).但每次我输入另一个值时,它都会替换旧的值,而不是仅添加数组的末尾.哪里不对？

<?PHP

$playlist = array("Be more.mP3","Drift Away.mp3","Panda Sneeze.mp3");

function add_songs_playlist() {

global $playlist;
?>

<form method = "post">
<input tyPE = "text" name = "name1"/>
<input type = "submIT" name = "submit1"/>
</form>

<?PHP

if (isset($_POST['submit1'])) {
$newsong = $_POST['name1'];
array_push($playlist,$newsong);

}
}

add_songs_playlist();

foreach ($playlist as $value) {

echo $value."<br>";
}