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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 938 | $type = wp_check_filetype( $$fallback, wp_get_mime_types() ); |
| 939 | $html .= sprintf( $source, $type['type'], esc_url( $$fallback ) ); |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | if ( 'mediaelement' === $library ) |
| 944 | $html .= wp_mediaelement_fallback( $fileurl ); |
| 945 | $html .= '</audio>'; |
| 946 | |
| 947 | return apply_filters( 'wp_audio_shortcode', $html, $atts, $audio, $post_id, $library ); |
| 948 | } |
| 949 | add_shortcode( 'audio', apply_filters( 'wp_audio_shortcode_handler', 'wp_audio_shortcode' ) ); |
| 950 | |
| 951 | /** |
| 952 | * Return a filtered list of WP-supported video formats |
| 953 | * |
| 954 | * @since 3.6.0 |
| 955 | * @return array |
| 956 | */ |