Complete source code display of image upload function developed in PHP

<?php
if (in_array($_FILES["file"]["type"], array("image/gif", "image/jpeg","image/jpg"))) {
    if ($_FILES["file"]["error"] > 0)                         //由文件上传导致的错误提示代码
    {
        echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
    }
    else
    {
        echo "Upload: " . $_FILES["file"]["name"] . "<br />";
        echo "Type: " .  $_FILES["file"]["type"] . "<br />";
        echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
        echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";
        if (file_exists("upload/" . $_FILES["file"]["name"]))
        {
            echo $_FILES["file"]["name"] . " already exists. ";
        }
        else
        {
            move_uploaded_file($_FILES["file"]["tmp_name"],                   // 存储在服务器的文件的临时副本的名称
                "upload/" . $_FILES["file"]["name"]);
            echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
        }
    }
}
else
{
    echo "Invalid file";
}
?>
<html>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no" />
<body>
<form action="upload.php" method="post"
      enctype="multipart/form-data">
    <label for="file">文件名:</label>
    <input type="file" name="file" id="file" />
    <br />
    <input type="submit" name="submit" value="上传" />
</form>
</body>
</html>

Second method:

<?php
if (count($_FILES)) {
    $retFiles = uploadFile("file");
    if ($retFiles['status'] == 1) {
        echo $retFiles['message'];
    } else if ($retFiles['status'] == 0) {
        echo "Upload: " . $retFiles["name"] . "<br />";
        echo "Type: " .  $retFiles["type"] . "<br />";
        echo "Size: " . ($retFiles["size"] / 1024) . " Kb<br />";
        echo "Temp file: " . $retFiles["temp"] . "<br />";
        echo "Stored in: " . "upload/" . $retFiles["name"];
    }
}
function uploadFile($fileName)
{
    $files = $_FILES[$fileName];
    if (!in_array($files["type"], array("image/gif","image/jpeg","image/pjpeg","image/jpeg", "image/png"))) {
        return array("status" => 1, "message" => "Uploaded image format is not correct");
    }
    
    if ($files["error"] > 0) {
        return array("status" => 1, "message" => "upload error");
    }
    if (file_exists("upload/" . $files["name"])) {
        return array("status" => 1, "message" => $files["name"]." already exiss");
    }
    move_uploaded_file($files["tmp_name"], "upload/".$files["name"]);
    return array("status" => 0, "name" => $files["name"], "type" => $files["type"], "size" => $files['size']/1024, "temp" => $files["tmp_name"]);
}
?>
<html>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no" />
<body>
<form action="upload.php" method="post"
      enctype="multipart/form-data">
    <label for="file">文件名:</label>
    <input type="file" name="file" id="file" />
    <br />
    <input type="submit" name="submit" value="上传" />
</form>
</body>
</html>

new file

<?php

if (count($_FILES)) {
 $retFiles = uploadFile("file");
 if ($retFiles['status'] == 1) {
 echo $retFiles['message'];
 } else if ($retFiles['status'] == 0) {
 echo "Upload: " . $retFiles["name"] . "<br />";
 echo "Type: " . $retFiles["type"] . "<br />";
 echo "Size: " . ($retFiles["size"] / 1024) . " Kb<br />";
 echo "Temp file: " . $retFiles["temp"] . "<br />";
 echo "Stored in: " . "upload/" . $retFiles["name"];
 }
}
function uploadFile($fileName)
{
 $files = $_FILES[$fileName];
 if (!in_array($files["type"], array("image/gif","image/jpeg","image/pjpeg","image/jpeg", "image/png"))) {
 return array("status" => 1, "message" => "Uploaded image format is not correct");
 }
 
 if ($files["error"] > 0) {
 return array("status" => 1, "message" => "upload error");
 }
 if (file_exists("upload/" . $files["name"])) {
 return array("status" => 1, "message" => $files["name"]." already exiss");
 }
 move_uploaded_file($files["tmp_name"], "upload/".$files["name"]);
 return array("status" => 0, "name" => $files["name"], "type" => $files["type"], "size" => $files['size']/1024, "temp" => $files["tmp_name"]);
}
?>
<html>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no" />
<body>
<form action="upload.php" method="post"
 enctype="multipart/form-data">
 <label for="file">文件名:</label>
 <input type="file" name="file" id="file" />
 <br />
 <input type="submit" name="submit" value="上传" />
</form>
</body>
</html>

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Automatic operation

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