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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 | 
|---|---|
| 204 |                     echo '<div id="wp-' . $editor_id . '-media-buttons" class="wp-media-buttons">'; | 
| 205 |  | 
| 206 |                     /** | 
| 207 |                      * Fires after the default media button(s) are displayed. | 
| 208 |                      * | 
| 209 |                      * @since 2.5.0 | 
| 210 |                      * | 
| 211 |                      * @param string $editor_id Unique editor identifier, e.g. 'content'. | 
| 212 |                      */ | 
| 213 |                     do_action( 'media_buttons', $editor_id ); | 
| 214 |                     echo "</div>\n"; | 
| 215 |                } | 
| 216 |  | 
| 217 |                echo '<div class="wp-editor-tabs">' . $buttons . "</div>\n"; | 
| 218 |                echo "</div>\n"; | 
| 219 |           } | 
| 220 |  | 
| 221 |           /** | 
| 222 |            * Filter the HTML markup output that displays the editor. |