wp_check_filetype( string $filename, array $mimes = null )

Retrieve the file type from the file name.

Description

You can optionally define the mime array, if needed.

Parameters

$filename

(Required) File name or path.

$mimes

(Optional) Key is the file extension with value as the mime type.

Default value: null

Return

(array) Values with extension first and mime type.

Source

File: wp-includes/functions.php 

function wp_check_filetype( $filename, $mimes = null ) {
	if ( empty($mimes) )
		$mimes = get_allowed_mime_types();
	$type = false;
	$ext = false;

	foreach ( $mimes as $ext_preg => $mime_match ) {
		$ext_preg = '!\.(' . $ext_preg . ')$!i';
		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
			$type = $mime_match;
			$ext = $ext_matches[1];
			break;
		}
	}

	return compact( 'ext', 'type' );
}

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Related

Uses

Uses
Uses Description
wp-includes/functions.php: get_allowed_mime_types()

Retrieve list of allowed mime types and file extensions.

Used By

Used By
Used By Description
wp-includes/media.php: wp_get_image_editor()

Returns a WP_Image_Editor instance and loads file into it.
wp-includes/media.php: wp_playlist_shortcode()

Builds the Playlist shortcode output.
wp-includes/media.php: wp_audio_shortcode()

Builds the Audio shortcode output.
wp-includes/media.php: wp_video_shortcode()

Builds the Video shortcode output.
wp-includes/theme.php: get_header_video_settings()

Retrieve header video settings.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::prepare_starter_content_attachments()

Prepare starter content attachments.
wp-includes/post.php: wp_attachment_is()

Verifies an attachment is of a given type.
wp-includes/formatting.php: sanitize_file_name()

Sanitizes a filename, replacing whitespace with dashes.
wp-includes/functions.php: wp_check_filetype_and_ext()

Attempt to determine the real file type of a file.
wp-includes/functions.php: wp_upload_bits()

Create a file in the upload folder with given content.
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Changelog

Changelog
Version Description
WP-2.0.4 Introduced.