php上传文件唯一名称问题答案

【问题标题】：Php uploaded file unique name issuephp上传文件唯一名称问题
【发布时间】：2012-11-19 09:12:42
【问题描述】：

好吧，我有一个通过 .php 文件 (uploader.php) 处理的 html 上传表单。这是一个多文件上传的代码。

因此，当它上传时，所有文件都会以各自的文件名进入上传目录。比如：abc.jpg、abc2.jpg等。

但是如果有人上传了一个同名的文件，那么它就会覆盖现有文件。所以我需要上传文件的唯一名称。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);
}
?>

【问题讨论】：

我只是想用唯一的随机数重命名上传的文件名。
你创建，但不要使用 $image_named_uniq
uniqid()

标签： php mysql

【解决方案1】：

使用 uniqid() 。就是为此而生的。

【讨论】：

【解决方案2】：

您可以按照 wormhit 的建议连接 time(); 和 session_id() 或 uniqid() 对于每个文件的名称也是非常好的主意。

使用下面的代码：

<?php
$target_path = "images/";

$target_path = $target_path . basename( $_FILES['uploadedfile']['name']); 

if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
    echo "The file ".  basename( $_FILES['uploadedfile']['name']). 
    " has been uploaded";
} else{
    echo "There was an error uploading the file, please try again!";
}
//$upload_directory = ''.uniqid().'_'.dirname(__file__) . '/uploaded/'; //set upload directory

$uploaded_file="".$upload_directory ."/".uniqid()."_".$_FILES['images']['name'][$i]."";

if (move_uploaded_file($_FILES['images']['tmp_name'][$i],$uploaded_file)) {
            $number_of_moved_files++;
        }
?>


<?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

        $uploaded_file="".$upload_directory ."".uniqid()."_".$_FILES['images']['name'][$i]."";

        $number_of_uploaded_files++;
        $uploaded_files[] = $_FILES['images']['name'][$i];
        if (move_uploaded_file($_FILES['images']['tmp_name'][$i],$uploaded_file)) {
            $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);
}
?>

【讨论】：

是的！@Vikas Umrao 这是个好主意！
@Vikash Umrao 如何用 time() 重命名原始文件名？
替换这个 $upload_directory = ''.uniqid().'_'.dirname(file) 。 '/上传/'; //从你的代码中设置上传目录

【解决方案3】：

你可以用这个

 $ext = pathinfo($file_name, PATHINFO_EXTENSION);
 $newfilename = substr( sha1(uniqid (rand())), 0, 10). '.'.$ext;

【讨论】：