What are common issues that can occur when uploading files through a form in PHP?

One common issue when uploading files through a form in PHP is exceeding the maximum file size allowed by the server. This can be solved by increasing the `upload_max_filesize` and `post_max_size` directives in the php.ini file. Another issue is not properly setting the `enctype="multipart/form-data"` attribute in the form tag, which is required for file uploads to work correctly. 

// Increase maximum file size allowed by the server
ini_set('upload_max_filesize', '10M');
ini_set('post_max_size', '10M');

// Ensure form tag has enctype="multipart/form-data"
<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="Upload">
</form>

Keywords

file upload PHP form file size limit file type validation error handling

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