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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 |
|---|---|
| 268 | $update = false; |
| 269 | |
| 270 | if ( !empty($link_id) ) |
| 271 | $update = true; |
| 272 | |
| 273 | $link_id = (int) $link_id; |
| 274 | |
| 275 | if( trim( $link_name ) == '' ) |
| 276 | return 0; |
| 277 | $link_name = apply_filters('pre_link_name', $link_name); |
| 278 | |
| 279 | if( trim( $link_url ) == '' ) |
| 280 | return 0; |
| 281 | $link_url = apply_filters('pre_link_url', $link_url); |
| 282 | |
| 283 | if ( empty($link_rating) ) |
| 284 | $link_rating = 0; |
| 285 | else |
| 286 | $link_rating = (int) $link_rating; |