PHP通过循环上传多个图像
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【中文标题】PHP通过循环上传多个图像【英文标题】:PHP Upload Multiple Images through Loop 【发布时间】:2021-11-02 03:45:17 【问题描述】:我正在尝试循环上传多张图片,但由于某种原因,它会创建目录、上传 1 个文件并创建 mysql 记录,所以我不确定为什么它只上传 1 个文件,即使我已经打印了$i 看看有多少文件被计算在内,它总是计算正确的数量。
PHP
function generateRandomString($length = 25)
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$charactersLength = strlen($characters);
$randomString = '';
for ($i = 0; $i < $length; $i++)
$randomString .= $characters[rand(0, $charactersLength - 1)];
return $randomString;
if (isset($_POST['newYoungSubmit']))
$imageDirectory = "images/youngMembers";
$newDirName = generateRandomString(20);
$postDate = date("Y-m-d");
$targetDir = $imageDirectory."/".$newDirName."/";
if (!file_exists($targetDir))
mkdir($targetDir, 0777, true);
else
$newDirName = generateRandomString(20);
$targetDir = $imageDirectory."/".$newDirName."/";
// Count total files
$fileCount = count($_FILES['new_young']['name']);
// Iterate through the files
for($i = 0; $i < $fileCount; $i++)
$target_dir = $imageDirectory."/".$newDirName."/";
$target_file = $target_dir . basename($_FILES["new_young"]["name"][$i]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
// Check if image file is a actual image or fake image
$check = getimagesize($_FILES["new_young"]["tmp_name"][$i]);
if($check !== false)
//echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
else
$errorTxt = "File is not an image.";
$uploadOk = 0;
// Check if file already exists
if (file_exists($target_file))
$errorTxt = "Sorry, file already exists.";
$uploadOk = 0;
// Check file size
// if ($_FILES["new_young"]["size"] > 500000)
// $errorTxt = "Sorry, your file is too large.";
// $uploadOk = 0;
//
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" )
$errorTxt = "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
// Check if $uploadOk is set to 0 by an error
$temp = explode(".", $_FILES["new_young"]["name"][$i]);
$newfilename = round(microtime(true)) . '.' . end($temp);
if ($uploadOk == 0)
// if everything is ok, try to upload file
else
if (move_uploaded_file($_FILES["new_young"]["tmp_name"][$i], $target_dir . $newfilename))
//echo "The file ". basename( $_FILES["new_young"]["name"]). " has been uploaded.";
else
$errorTxt = "Sorry, there was an error uploading your file.";
$newYoungQuery = $conn->prepare("INSERT INTO youngMembers (youngTitle, youngImgDir, youngDesc) VALUES (?,?,?)");
$newYoungQuery->execute([$_POST['youngTitle'], $targetDir, $_POST['youngDesc']]);
$newYoungQuery = null;
HTML
<form class="col s12" method="POST" action="" enctype="multipart/form-data">
<div class="row">
<div class="input-field col s12 m6">
<input name="youngTitle" id="youngTitle" required type="text" class="validate">
<label for="youngTitle">Title<span class="red-text">*</span></label>
</div>
<div class="file-field input-field col s12 m6">
<div class="btn">
<span>Image(s)</span>
<input name="new_young[]" type="file" multiple="multiple">
</div>
<div class="file-path-wrapper">
<input class="file-path validate" type="text">
</div>
</div>
</div>
<div class="row">
<div class="input-field col s12 m12">
<div class="input-field col s12 m12">
<textarea id="youngDesc" name="youngDesc" class="materialize-textarea" data-length="4096"></textarea>
<label for="youngDesc">Description</label>
</div>
</div>
</div>
<div class="row">
<div class="col s12 m3 offset-m9 input-field">
<input type="submit" class="white green-button-border black-text btn-large" name="newYoungSubmit">
</div>
</div>
</form>
我已经上传了 html 表单和提交表单时运行的 php 脚本,据我所知,我的脚本将检查表单是否已提交,生成一个随机字符串,该字符串将成为新目录名称,在我检查它是否已创建之后,如果没有创建新目录,然后我运行一个循环循环遍历并将所有选定的图像上传到该目录,最后我将数据上传到 MySQL 表。
【问题讨论】:
TL;DR; - 与$targetDir
和$target_dir
有什么关系?
(1) 你确定它只上传 1 个文件吗?乍一看它上传多个文件,但插入一个数据库记录。 (2)不要使用round(microtime(true)),请考虑使用随机生成的字符串作为文件名(如果你的服务器超快,那么它可以同时处理多个文件并且文件名相同) ,因此新文件将覆盖以前的文件)
【参考方案1】:
问题在于,我认为正确浏览了代码并对其进行了测试,因为文件正在以新名称保存并且新名称是使用以下命令生成的:
$newfilename = round( microtime(true) ) . '.' . end($temp);
当我在上传 3 个文件时对此进行测试时,我在添加一些调试语句时观察到以下情况。
..OK
1630745144.jpg - OK
..OK
1630745144.jpg - OK
..OK
1630745144.jpg - OK
所有三个都分配了相同的名称,因此只有最后一个似乎已上传,而其他两个已被覆盖。
提到的调试是:
$newfilename = round( microtime(true) ) . '.' . end($temp);
if ($uploadOk == 0)
echo $errorTxt;
else
if (move_uploaded_file($_FILES["new_young"]["tmp_name"][$i], $target_dir . $newfilename))
echo '..OK<br />';
else
$errorTxt = "Sorry, there was an error uploading your file.";
echo $newfilename . ' - OK<br />';
人们会假设这里的$errorTxt
会声明文件已经存在,但事实并非如此,因为$target_file
和$newfilename
不会相同。新名称应在if (file_exists($target_file))
检查之前生成。
所以 - 如果您将原始代码中的相关代码更改为此,逻辑测试将起作用,但文件仍将无法上传。
$temp = explode(".", $_FILES["new_young"]["name"][$i]);
$newfilename = round( microtime(true) ) . '.' . end($temp);
$target_file = $target_dir . $newfilename;
if (file_exists($target_file))
$errorTxt = "Sorry, file already exists.";
$uploadOk = 0;
if ($uploadOk == 0)
// if everything is ok, try to upload file
echo $errorTxt;
else
if (move_uploaded_file($_FILES["new_young"]["tmp_name"][$i], $target_file ))
//echo "The file ". basename( $_FILES["new_young"]["name"]). " has been uploaded.";
else
$errorTxt = "Sorry, there was an error uploading your file.";
现在的问题是$newfilename = round( microtime(true) )
将生成相同的整数 - 一个大整数但相同。从微时间派生的精度会丢失,因此您可以将其修改为:
$newfilename = str_replace( '.', '', strval( microtime( true ) ) ) . '.' . end( $temp );
完成后,您的代码应该一切正常 - 上传了三张图片即可。
【讨论】:
我没有检查代码的 SQL 部分以上是关于PHP通过循环上传多个图像的主要内容,如果未能解决你的问题,请参考以下文章