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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 |                     <p class="upload-instructions drop-instructions"><?php _ex( 'or', 'Uploader: Drop files here - or - Select Files' ); ?></p> | 
| 205 |                     <button type="button" class="browser button button-hero"><?php _e( 'Select Files' ); ?></button> | 
| 206 |                </div> | 
| 207 |  | 
| 208 |                <div class="upload-inline-status"></div> | 
| 209 |  | 
| 210 |                <div class="post-upload-ui"> | 
| 211 |                     <?php | 
| 212 |                     /** This action is documented in wp-admin/includes/media.php */ | 
| 213 |                     do_action( 'pre-upload-ui' ); | 
| 214 |                     /** This action is documented in wp-admin/includes/media.php */ | 
| 215 |                     do_action( 'pre-plupload-upload-ui' ); | 
| 216 |  | 
| 217 |                     if ( 10 === remove_action( 'post-plupload-upload-ui', 'media_upload_flash_bypass' ) ) { | 
| 218 |                          /** This action is documented in wp-admin/includes/media.php */ | 
| 219 |                          do_action( 'post-plupload-upload-ui' ); | 
| 220 |                          add_action( 'post-plupload-upload-ui', 'media_upload_flash_bypass' ); | 
| 221 |                     } else { | 
| 222 |                          /** This action is documented in wp-admin/includes/media.php */ |