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Implementation of simple upload function in PHP development

2022-07-28 05:05:00 【A dream against the sky】

The first 1 Chapter PHP Development of simple upload function

1.1 PHP Upload principle and implementation of file upload

file.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title> Upload files </title>
</head>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
     Please select the file to upload ：<br>
    <input type="file" name="myFile"><br>
    <input type="submit" value=" Upload ">
</form>
</body>
</html>

upload.php：

<?php
header("content-type:text/html;charset=utf-8");
//  File upload processing program 
// $_FILES File upload variables 
//echo "<pre>";
//var_dump($_FILES);
//exit();
//echo "</pre>";
//  Handling upload files 
$filename = $_FILES['myFile']['name'];
$type = $_FILES['myFile']['type'];
$tmp_name = $_FILES['myFile']['tmp_name'];
$size = $_FILES['myFile']['size'];
$error = $_FILES['myFile']['error'];
//  Move the temporary files on the server to the specified location 
move_uploaded_file($tmp_name, "upload/".$filename); //  Folders should be created in advance 
//  Check according to our errors or report to the user directly 
if ($error == 0) {
    
    echo " Upload successful ！!";
} else {
    
    switch ($error) {
    
        case 1:
            echo " Exceeded the maximum upload file , Please upload 2M The following documents ！";
            break;
        case 2:
            echo " Too many uploaded files ！";
            break;
        case 3:
            echo " The file has not been uploaded ！";
            break;
        case 4:
            echo " No upload file selected ！";
            break;
        case 5:
            echo " The upload file is 0！";
            break;
    }
}
?>

1.2 PHP Realize the upload limit of file upload

file2.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title> Upload files （ Client limitations ）</title>
</head>
<body>
<form action="upload2.php" method="post" enctype="multipart/form-data">
    <input type="hidden" name="MAX_FILE_SIZE" value="101321">
     Please select the file to upload ：
    <input type="file" name="myFile" accept="image/jpeg,image/gif,text/html"><br>
    <input type="submit" value=" Upload ">
</form>
</body>
</html>

upload2.php：

<?php
header('content-type:text/html;charset=utf-8');
//  Receive the file , Temporary file information 
$file_info = $_FILES['myFile']; //  Dimension reduction operation 
$file_name = $file_info['name'];
$tmp_name = $file_info['tmp_name'];
$size = $file_info['size'];
$type = $file_info['type'];
$error = $file_info['error'];

//  Set limits on the server side 
$maxsize = 10485760; // 10M,10*1024*1024
$allowExt = array('jpeg','jpg','png','gif'); //  The types of files allowed to be uploaded （ Extension ）
$ext = pathinfo($file_name, PATHINFO_EXTENSION); //  Extract the extension of the uploaded file 
//  Target storage folder 
$path = "uploads";
if (!file_exists($path)) {
    
    //  If the directory does not exist , Create 
    mkdir($path, 0777, true); //  Create directory 
    chmod($path, 0777); //  Modify file mode , Everyone has read 、 Write 、 Executive authority 
}
//  Get a unique file name , Prevent overwriting due to the same file name 
$uniName = md5(uniqid(microtime(true),true)).".$ext"; // md5 encryption ,uniqid Produce a unique id,microtime Prefix 
//  Destination file address 
$destination = $path."/".$uniName;
//  When the file is uploaded successfully , Save to temporary folder , The server starts to judge 
if ($error===0) {
    
    if ($size > $maxsize) {
    
        exit(" The upload file is too large ！");
    }
    if (!in_array($ext, $allowExt)) {
    
        exit(" Illegal file type ！");
    }
    if (!is_uploaded_file($tmp_name)) {
    
        exit(" Wrong upload method , Please use post The way ！");
    }
    //  Determine whether it is a real picture （ Prevent viruses disguised as pictures 
    if (!getimagesize($tmp_name)) {
    
        // getimagesize by true Returns an array , Otherwise return to false
        exit(" It's not really a picture type ！");
    }
    // move_uploaded_file($tmp_name, "upload/".$file_name);
    if (@move_uploaded_file($tmp_name, $destination)) {
    
        // @ Error suppressor , Don't let users see the warning 
        echo " file ".$file_name." Upload successful ！";
    } else {
    
        echo " file ".$file_name." Upload failed ！";
    }
} else {
    
    switch ($error) {
    
        case 1:
            echo " The maximum number of uploaded files has been exceeded , Please upload 2M The following documents ！";
            break;
        case 2:
            echo " Too many uploaded files , You can only upload files at a time, and it must not exceed 20 individual ！";
            break;
        case 3:
            echo " The file was not completely uploaded , Please try again ！";
            break;
        case 4:
            echo " No upload file selected ！";
            break;
        case 7:
            echo " No temporary folders ！";
            break;
    }
}

1.3 PHP Realize the package upload function of file upload

file3.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title> Upload files （ Client limitations ）</title>
</head>
<body>
<form action="upload3.php" method="post" enctype="multipart/form-data">
    <input type="hidden" name="MAX_FILE_SIZE" value="101321">
     Please select the file to upload ：
    <input type="file" name="myFile" accept="image/jpeg,image/gif,text/html"><br>
    <input type="submit" value=" Upload ">
</form>
</body>
</html>

file_upload.php：

<?php
function uploadFile ($file_info, $path, $maxsize, $allowExt) {
    
    header('content-type:text/html;charset=utf-8');
//  Receive the file , Temporary file information 
    $file_name = $file_info['name'];
    $tmp_name = $file_info['tmp_name'];
    $size = $file_info['size'];
    $type = $file_info['type'];
    $error = $file_info['error'];

//  Set limits on the server side 
    $ext = pathinfo($file_name, PATHINFO_EXTENSION); //  Extract the extension of the uploaded file 
//  Target storage folder 
    if (!file_exists($path)) {
    
        //  If the directory does not exist , Create 
        mkdir($path, 0777, true); //  Create directory 
        chmod($path, 0777); //  Modify file mode , Everyone has read 、 Write 、 Executive authority 
    }
//  Get a unique file name , Prevent overwriting due to the same file name 
    $uniName = md5(uniqid(microtime(true),true)).".$ext"; // md5 encryption ,uniqid Produce a unique id,microtime Prefix 
//  Destination file address 
    $destination = $path."/".$uniName;
//  When the file is uploaded successfully , Save to temporary folder , The server starts to judge 
    if ($error===0) {
    
        if ($size > $maxsize) {
    
            exit(" The upload file is too large ！");
        }
        if (!in_array($ext, $allowExt)) {
    
            exit(" Illegal file type ！");
        }
        if (!is_uploaded_file($tmp_name)) {
    
            exit(" Wrong upload method , Please use post The way ！");
        }
        //  Determine whether it is a real picture （ Prevent viruses disguised as pictures 
        if (!getimagesize($tmp_name)) {
    
            // getimagesize by true Returns an array , Otherwise return to false
            exit(" It's not really a picture type ！");
        }
        // move_uploaded_file($tmp_name, "upload/".$file_name);
        if (@move_uploaded_file($tmp_name, $destination)) {
    
            // @ Error suppressor , Don't let users see the warning 
            echo " file ".$file_name." Upload successful ！";
        } else {
    
            echo " file ".$file_name." Upload failed ！";
        }
    } else {
    
        switch ($error) {
    
            case 1:
                echo " The maximum number of uploaded files has been exceeded , Please upload 2M The following documents ！";
                break;
            case 2:
                echo " Too many uploaded files , You can only upload files at a time, and it must not exceed 20 individual ！";
                break;
            case 3:
                echo " The file was not completely uploaded , Please try again ！";
                break;
            case 4:
                echo " No upload file selected ！";
                break;
            case 7:
                echo " No temporary folders ！";
                break;
        }
    }
    return $destination;
}

upload3.php：

<?php
header('content-type:text/html;charset=utf-8');
//  Initialization of related variables 
$file_info = $_FILES['myFile']; //  Dimension reduction operation 
$maxsize = 10485760; // 10M,10*1024*1024
$allowExt = array('jpeg','jpg','png','gif'); //  The types of files allowed to be uploaded （ Extension ）
$path = "uploads";
//  Introduce file upload function 
include_once 'file_upload.php';
uploadFile($file_info, $path, $maxsize, $allowExt);
?>

1.4 PHP Realize the uploading of many files

file4.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title> Multiple file upload </title>
</head>
<body>
<form action="upload4.php" method="post" enctype="multipart/form-data">
     Please select the file to upload ：<br>
    <input type="file" name="myFile1"><br>
     Please select the file to upload ：<br>
    <input type="file" name="myFile2"><br>
     Please select the file to upload ：<br>
    <input type="file" name="myFile3"><br>
     Please select the file to upload ：<br>
    <input type="file" name="myFile4"><br>
     Please select the file to upload ：<br>
    <input type="file" name="myFile5"><br>
     Please select the file to upload ：<br>
    <input type="file" name="myFile6"><br>
    <input type="submit" value=" Upload ">
</form>
</body>
</html>

upload4.php：

<?php
header("content-type:text/html;charset=utf-8");
include_once 'file_upload.php';
//  Initialization of related variables 
$maxsize = 10485760; // 10M,10*1024*1024
$allowExt = array('jpeg','jpg','png','gif'); //  The types of files allowed to be uploaded （ Extension ）
$path = "uploads";
foreach ($_FILES as $file_info) {
    
    $file[] = uploadFile($file_info, $path, $maxsize, $allowExt);
}