PHP Image Upload

Question

我試圖將圖片上傳到一個文件夾並將路徑保存在表格中。我試圖上傳一個jpg圖像，但它顯示錯誤：

您試圖上傳的文件是不允許的。

和

未定義指數：userfile的在C：\瓦帕\ WWW \網絡\上線db_add_page.php 21.

這是我的代碼：

add_page.php

<form action="db_sql/db_add_page.php" method="post"> 
    <input type="text" size="100" name="tittle" required /> 
    <input type="file" name="userfile"/> 
    <input type="submit" value="Submit"> 
</form> 

db_add_page.php

$tittle = $_POST['tittle']; 
$allowed_filetypes = array('.jpg','.jpeg','.png','.gif'); 
$max_filesize = 10485760; 
$upload_path = 'uploads/'; 

$filename = $_FILES['userfile']['name']; 
$ext = substr($filename, strpos($filename,'.'), strlen($filename)-1); 

if (!in_array($ext,$allowed_filetypes)) 
    die('The file you attempted to upload is not allowed.'); 

if (filesize($_FILES['userfile']['tmp_name']) > $max_filesize) 
    die('The file you attempted to upload is too large.'); 

if (!is_writable($upload_path)) 
    die('You cannot upload to the specified directory'); 

if (move_uploaded_file($_FILES['userfile']['tmp_name'],$upload_path . $filename)) 
{ 
    $acc_status = "INSERT INTO add_services (aid,tittle,name) 
    VALUES(NULL,'".$tittle."','".$filename."')"; 
    db::getInstance()->exec($acc_status); 
} 

Answer 1

有一個在<形式>標籤丟失屬性。您需要設置envtype以獲取文件。 試試這個：

<form action="db_sql/db_add_page.php" method="post" enctype="multipart/form-data"> 

Answer 2

finaly我發現我的錯誤

$ext = substr($filename, strpos($filename,'.'), strlen($filename)-1); 

應該

$ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION)); 

和

$allowed_filetypes = array('.jpg','.jpeg','.png','.gif'); 

應該

$allowed_filetypes = array('jpg','jpeg','png','gif'); 

感謝您的支持。