WordPress at a glance
filter is not described

emoji_ext filter-hook . WP 4.2.0

Filters the extension of the emoji png files.

Usage

add_filter( 'emoji_ext', 'filter_function_name_851' );
function filter_function_name_851( $string ){
	// filter...

	return $string;
}
$string(string)
The emoji extension for png files. Default .png.

Where the hook is called

_print_emoji_detection_script()
emoji_ext
wp_staticize_emoji()
emoji_ext
wp-includes/formatting.php 5046
'ext' => apply_filters( 'emoji_ext', '.png' ),
wp-includes/formatting.php 5180
$ext = apply_filters( 'emoji_ext', '.png' );

Where the hook is used (in WP core)

Does not used.