PHP：不上传图片

Question

<?php

if(isset($_POST["submit-post"])){
    $desc = $_POST['description'];
    if (strpos($desc, "'") !== false) {
        $desc = str_replace("'", "_", $desc);
    }
    $sql_home = "INSERT INTO home (description) VALUES ('$desc');";
    if($conn->query($sql_home) === TRUE){ echo "<br>Great!<br>"; }
    else{ echo("<br>Nope!<br> "); }
    $uploaddir = $_SERVER['DOCUMENT_ROOT']. '/imgs/home/';
    $uploadfile = $uploaddir . basename($_FILES['image']['name']);
    if (move_uploaded_file($_FILES['image']['tmp_name'], $uploadfile)) {
        echo "File is valid, and was successfully uploaded. <br>";
    } else {
        echo "Possible file upload attack! <br>";
        echo "$uploadfile <br>";
    }
    echo '<br>Here is some more debugging info: ';
    print_r($_FILES);
    echo "<br>";
    error_reporting(-1); ini_set("display_errors", true); //?
}

?>

Every time I try to upload an image ( .jpg ) it says "Possible file upload attack!". Help. Gives me two warnings:

Warning: move_uploaded_file(/var/www/html/imgs/home/calcetto.jpg): failed to open stream: Permission denied in /var/www/html/admin/db/manage.php on line 199
Warning: move_uploaded_file(): Unable to move '/tmp/phpGvLsAC' to '/var/www/html/imgs/home/calcetto.jpg' in /var/www/html/admin/db/manage.php on line 199

Please note:

1. I tried both absolute and relative paths;
2. php.ini: file_uploads = On
3. I copied and pasted the code from php.net
4. this file is /var/www/html/admin/db/manage.php
5. images to upload are here: /var/www/html/imgs/home

Here is the html:

<form action="" method="post" enctype="multipart/form-data">
    <textarea name='description' placeholder='Image description'></textarea><br>
    <input type="file" name="image"><br><br>
    <input type='submit' name='submit-post' value='Upload'></input>
</form>

Answer 1

I am writing my answer from comments.

Please check for the errors by PHP error reporting

just write

error_reporting(-1);
ini_set("display_errors", true);

you need to check for permission to the upload directory, if you have subdirectory then you need to have write permission on both of the directories

you can change the permission by the following commands -R will update the permissions for subdirectories as well

chmod -R 777 uploaddirectory