php简单上传图片到服务器 - 后缀不变 - 时间戳作为文件名

最新推荐文章于 2024-11-12 13:11:52 发布

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最新推荐文章于 2024-11-12 13:11:52 发布

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本文介绍了一个简单的PHP文件上传示例，通过设置时间戳和文件扩展名来生成唯一文件名，并验证上传文件是否为图片格式，确保文件大小不超过限制且文件类型符合要求。

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上午的时候做了desgin，手有点痒痒，好吧，要不试试白。

先定个小目标，完成到本地服务器的上传，参考了 http://www.w3schools.com/php/php_file_upload.asp, 稍微加了变量，修改了输出，效果如下。

这里写图片描述

代码如下：

<?php
date_default_timezone_set("Asia/Shanghai");
$mytime=date("YmdHis");
$myextension=end(explode(".",$_FILES["fileToUpload"]["name"]));

$target_dir = "uploads/";
//$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$target_file = $target_dir . $mytime . "." . $myextension;

// echo $mytime . "<br>";
// echo $myextension . "<br>";
// echo $target_file . "<br>";

$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded." . "<br>";
        echo "You can use the following line to your blog markdown editor!" . "<br>";
        echo "![mark](http://soft.ops.ac.cn/php/" . $target_file . ")";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>

<!DOCTYPE html>
<html>
<body>

<form name="uploadform" action="up.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>