Warning: getimagesize() [function.getimagesize]: Filename cannot be empty warning message?

问题

Up until recently I've been using some PHP to upload photos to a site. But suddenly it's started triggering all sorts of error messages.

I use a form that on action runs the following code:

$uploaddir = "../../user_content/photo/";
$allowed_ext = array("jpeg", "jpg", "gif", "png");

    if(isset($_POST["submit"])) {
        $file_temp = $_FILES['file']['tmp_name'];   
        $info = getimagesize($file_temp);
    } else {
        print "File not sent to server succesfully!";
        exit;
    }

The file upload part of the form has the following elements:

<input name="file" type="file" class="photo_file_upload">

The submit button for uploading has the following attributes:

<button type="submit" name="submit" class="photo_upload">Upload</button>

But whenever I run this, I always get the following warning:

Warning: getimagesize() [function.getimagesize]: Filename cannot be empty in (upload PHP file) on line 10

(line 10 is this part: $info = getimagesize($file_temp);)

Anyone have any ideas on what the cause of this is?

回答1:

You checked if the form was submitted, but didn't check if the file was sent. In some cases, a form could be submitted but the file will not sent (i.e. file size is bigger then file size limit in config).

Use this:

if(isset($_POST["submit"]) && isset($_FILES['file'])) {
    $file_temp = $_FILES['file']['tmp_name'];   
    $info = getimagesize($file_temp);
} else {
    print "File not sent to server succesfully!";
    exit;
}

You see && isset($_FILES['file']) is new

Or you can extend it

if(isset($_POST["submit"]) && isset($_FILES['file'])) {
    $file_temp = $_FILES['file']['tmp_name'];   
    $info = getimagesize($file_temp);
} 
elseif(isset($_POST["submit"]) && !isset($_FILES['file'])) {
    print "Form was submitted but file wasn't send";
    exit;
}
else {
    print "Form wasn't submitted!";
    exit;
}

回答2:

Warning: getimagesize() [function.getimagesize]: Filename cannot be empty in

Verify the MAX_SIZE variable, example to define it for a 2Mo image:

define('MAX_SIZE', 2000000);
<form enctype="multipart/form-data" method="post" action="upload.php">
<input type="hidden" name="MAX_FILE_SIZE" value="<?php echo MAX_SIZE; ?>" /> 
<input name="fichier" type="file" id="fichier_a_uploader" /> <br>
<input type="submit" name="submit" value="Uploader" /> 
</form>

you can also verify the Maximum size of POST data that PHP will accept and Maximum allowed size for uploaded files in PHP.ini : post_max_size = ? upload_max_filesize = ?

回答3:

Change these parameters in your php.ini file; (Currently it allow only 2Mb size to upload and post). Sometimes it's reason for these errors.

upload_max_filesize = 500M
post_max_size = 500M
max_execution_time = 120

回答4:

you should change the form enctype to "multipart/form-data"

<form method="post" enctype="multipart/form-data">
     ....
</form>

回答5:

After you upgrade 'upload-max-filesize' , Restart all Services of wamp or xampp ! it will right !

回答6:

Notice: Undefined index: fileToUpload in D:\xampp\htdocs\public_html\php\form_php\application\process_application.php on line 38

Notice: Undefined index: fileToUpload in D:\xampp\htdocs\public_html\php\form_php\application\process_application.php on line 43

Warning: getimagesize(): Filename cannot be empty in D:\xampp\htdocs\public_html\php\form_php\application\process_application.php on line 43 File is not an image.Sorry, file already exists. Notice: Undefined index: fileToUpload in D:\xampp\htdocs\public_html\php\form_php\application\process_application.php on line 58 Sorry, only JPG, JPEG, PNG & GIF files are allowed.Sorry, your file was not uploaded.

If You Get Errors like this one you should check you have added form enctype to "multipart/form-data"

<form method="post" enctype="multipart/form-data">
     ....
</form>

Use to catch me out quite a lot to begin with.

来源：https://stackoverflow.com/questions/16043892/warning-getimagesize-function-getimagesize-filename-cannot-be-empty-warnin

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php

warnings

getimagesize