php上传文件唯一名称问题

Question

好吧，我有一个 html 上传表单，它由 .php 文件 (uploader.php) 处理。这是一个多文件上传代码。

所以当它上传时，所有文件都将以其各自的文件名进入上传目录。比如:abc.jpg, abc2.jpg 等

但是如果有人上传同名文件，那么它会覆盖现有文件。这样我就需要为上传的文件起一个唯一的名称。有没有办法用唯一的随机名称重命名文件。喜欢:12545454.jpge、234324324.jpge、323453253.jpg 等。

PHP代码:

<?php
if (isset($_POST['Submit'])) {
$number_of_file_fields = 0;
$number_of_uploaded_files = 0;
$number_of_moved_files = 0;
$uploaded_files = array();
$upload_directory = dirname(__file__) . '/uploaded/'; //set upload directory


/**
 * we get a $_FILES['images'] array ,
 * we procee this array while iterating with simple for loop
 * you can check this array by print_r($_FILES['images']);
 */
for ($i = 0; $i < count($_FILES['images']['name']); $i++) {
    $number_of_file_fields++;
    if ($_FILES['images']['name'][$i] != '') { //check if file field empty or not
        $number_of_uploaded_files++;
        $uploaded_files[] = $_FILES['images']['name'][$i];
        if (move_uploaded_file($_FILES['images']['tmp_name'][$i], $upload_directory . 
$_FILES['images']['name'][$i])) {
            $number_of_moved_files++;
        }

    }

}
echo "Number of File fields created $number_of_file_fields.<br/> ";
echo "Number of files submitted $number_of_uploaded_files . <br/>";
echo "Number of successfully moved files $number_of_moved_files . <br/>";
echo "File Names are <br/>" . implode(',', $uploaded_files);
}
?>  

Answer 1

使用uniqid() .它就是为此而生的。