如果名称重复，如何重命名上传的文件

Question

我在重复的名字中有一个小问题。 我想自动重命名所有重复的上传文件，例如给它们编号。

或者如果我可以使名称与数字相同，例如所有上传文件的file1.jpg / file2.jpg

这是我的代码

 <?php include('connect-db.php'); if (isset($_POST['submit'])) { $filename= $_FILES["imgfile"]["name"]; if ((($_FILES["imgfile"]["type"] == "image/gif")|| ($_FILES["imgfile"]["type"] == "image/jpeg") || ($_FILES["imgfile"]["type"] == "image/png") || ($_FILES["imgfile"]["type"] == "image/pjpeg")) && ($_FILES["imgfile"]["size"] < 20000000)) { if(file_exists($_FILES["imgfile"]["name"])) { echo "File name exists."; } else { move_uploaded_file($_FILES["imgfile"]["tmp_name"],"photos/$filename"); } } if (is_numeric($_POST['id'])) { $id = $_POST['id']; $id_photo= mysql_real_escape_string(htmlspecialchars($_POST['filename'])); // check that firstname/lastname fields are both filled in if ($filename== '' ) { // generate error message $error = 'ERROR: Please fill in all required fields!'; echo("<meta http-equiv='refresh' content='0'>"); //Refresh by HTTP META } else { // save the data to the database mysql_query("UPDATE table SET id_photo='$filename' WHERE id='$id' ") or die(mysql_error()); // once saved, redirect back to the view page echo("<meta http-equiv='refresh' content='0'>"); //Refresh by HTTP META } } else { // if the 'id' isn't valid, display an error echo 'Error!'; } } ?> 

即使回显if（file_exists（$ _ FILES [“ imgfile”] [“ name”]）））也不起作用，我也不知道为什么

非常感谢，然后再回复

Answer 1

尝试此代码， 此代码将永远不会获得相同的名称，此代码将重命名文件，如2jh5425h44u5h45h454k5image.jpg这就是它将如何保存文件，因此无需担心重复的文件，我已经添加了随机名称生成器$newname = md5(rand() * time()); 这将为您的文件生成随机名称

    <?php

include('connect-db.php');
$newname = md5(rand() * time());
if (isset($_POST['submit'])) {

    $filename = $_FILES["imgfile"]["name"];
    if ((($_FILES["imgfile"]["type"] == "image/gif") || ($_FILES["imgfile"]["type"] == "image/jpeg") || ($_FILES["imgfile"]["type"] == "image/png") || ($_FILES["imgfile"]["type"] == "image/pjpeg")) && ($_FILES["imgfile"]["size"] < 20000000)) {
        if (file_exists($_FILES["imgfile"]["name"])) {
            echo "File name exists.";
        } else {
            move_uploaded_file($_FILES["imgfile"]["tmp_name"], "photos/$newname . $filename");
        }
    }
    if (is_numeric($_POST['id'])) {
        $id = $_POST['id'];

        $id_photo = mysql_real_escape_string(htmlspecialchars($_POST['filename']));

        // check that firstname/lastname fields are both filled in

        if ($filename == '') {
            // generate error message
            $error = 'ERROR: Please fill in all required fields!';

            echo("<meta http-equiv='refresh' content='0'>"); //Refresh by HTTP META
        } else {
            // save the data to the database
            mysql_query("UPDATE table SET id_photo='$filename' WHERE id='$id' ") or die(mysql_error());
            // once saved, redirect back to the view page

            echo("<meta http-equiv='refresh' content='0'>"); //Refresh by HTTP META
        }
    } else {
        // if the 'id' isn't valid, display an error
        echo 'Error!';
    }
}
?>

如果仅在文件重复的情况下需要重命名，请使用php重命名文件夹中的重复文件