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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 |
|---|---|
| 441 | wp_enqueue_media( array( |
| 442 | 'post' => $post |
| 443 | ) ); |
| 444 | |
| 445 | $img = '<span class="wp-media-buttons-icon"></span> '; |
| 446 | |
| 447 | echo '<a href="#" id="insert-media-button" class="button insert-media add_media" data-editor="' . esc_attr( $editor_id ) . '" title="' . esc_attr__( 'Add Media' ) . '">' . $img . __( 'Add Media' ) . '</a>'; |
| 448 | |
| 449 | // Don't use this filter. Want to add a button? Use the media_buttons action. |
| 450 | $legacy_filter = apply_filters('media_buttons_context', ''); // deprecated |
| 451 | |
| 452 | if ( $legacy_filter ) { |
| 453 | // #WP22559. Close <a> if a plugin started by closing <a> to open their own <a> tag. |
| 454 | if ( 0 === stripos( trim( $legacy_filter ), '</a>' ) ) |
| 455 | $legacy_filter .= '</a>'; |
| 456 | echo $legacy_filter; |
| 457 | } |
| 458 | } |
| 459 | add_action( 'media_buttons', 'media_buttons' ); |