WP_Image_Editor::get_default_quality()
Method: Returns the default compression quality setting for the mime type.
Source: wp-includes/class-wp-image-editor.php:308
_wp_check_alternate_file_names()
Function: Helper function to test if each of an array of file names could conflict with existing files.
Source: wp-includes/functions.php:2793
wp_get_default_extension_for_mime_type()
Function: Returns first matched extension for the mime-type, as mapped from wp_get_mime_types().
Source: wp-includes/functions.php:3000
wp_unique_filename
Filter Hook: Filters the result when generating a unique file name.
Source: wp-includes/functions.php:2779