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Change the name of files uploaded through the media uploader.
<?php
/**
* Class M_Custom_Uploads_Filename
*/
class M_Custom_Uploads_Filename {
/**
* M_Custom_Uploads_Filename constructor.
*/
public function __construct() {
$this->hooks();
}
/**
* Add the hooks used by the class.
*/
public function hooks() {
add_action( 'current_screen', array( $this, 'maybe_mark_upload' ) );
add_filter( 'sanitize_file_name', array( $this, 'maybe_change_filename' ), 10, 2 );
}
/**
* Check if we are in the right screen and add a filter for the media upload requests.
*
* @param WP_Screen $screen The current screen object.
*/
public function maybe_mark_upload( $screen ) {
// Check the screen id
if ( isset( $screen->id ) && 'toplevel_page_m-admin-page' === $screen->id ) {
add_filter( 'plupload_default_params', array( $this, 'add_uploads_parameter' ) );
}
}
/**
* Add the custom parameter to the set of default upload parameters.
*
* @param array $parameters The default parameters
*
* @return array
*/
public function add_uploads_parameter( $parameters ) {
$parameters['m_admin_page'] = 1;
return $parameters;
}
/**
* Check if the custom paramter set above is set and change the filename accordingly.
*
* @param string $filename The processed filename after sanitize filename function was called
* @param string $filename_raw
*
* @return string
*/
public function maybe_change_filename( $filename, $filename_raw ) {
if ( isset( $_POST['m_admin_page'] ) ) {
$filename = self::random_image_name();
}
return $filename;
}
/**
* Just a function used to generate random image names.
*
* @return string
*/
public static function random_image_name() {
$characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
$result = '';
for ( $i = 0; $i < 5; $i ++ ) {
$result .= $characters[ mt_rand( 0, 61 ) ];
}
$result .= '_' . substr( md5( time() ), - 5 );
$result .= '.jpg';
return $result;
}
}
// Comment this out if you'd rather call it somewhere else.
new M_Custom_Uploads_Filename();
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