What are common reasons for file upload failures in PHP, besides incorrect file paths?

Common reasons for file upload failures in PHP, besides incorrect file paths, include insufficient file upload size limits set in php.ini, incorrect file permissions on the upload directory, and missing enctype="multipart/form-data" attribute in the HTML form. 

// Increase file upload size limit in php.ini
ini_set('upload_max_filesize', '20M');

// Set correct file permissions on upload directory
chmod('uploads/', 0777);

// Ensure enctype="multipart/form-data" attribute is present in HTML form
<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 error handling file permissions file size limit

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