如果有重名，如何重命名上传的文件答案

【问题标题】：how to rename uploaded files if there's duplicated names如果有重名，如何重命名上传的文件
【发布时间】：2015-03-30 14:48:53
【问题描述】：

我在重复名称中遇到了一个小问题。我想自动重命名所有重复的上传文件，比如给它们编号。

或者如果我可以使名称与数字相同，例如 file1.jpg / file2.jpg 对于所有上传的文件

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 if(file_exists($_FILES["imgfile"]["name"])) 的回声也不起作用，我不知道为什么

非常感谢您在回复之前

【问题讨论】：

你要重命名上传文件？？？

标签： php upload

【解决方案1】：

试试这个代码 此代码将永远不会得到相同的名称此代码将重命名文件，如2jh5425h44u5h45h454k5image.jpg 这是它保存文件的方式，因此无需担心重复文件我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!';
    }
}
?>

如果您仅在文件重复时才需要重命名，请回答Renaming duplicate files in a folder with php

【讨论】：