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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 |
---|---|
299 | if ( !empty($link_id) ) |
300 | $update = true; |
301 |
|
302 | if( trim( $link_name ) == '' ) |
303 | return 0; |
304 | $link_name = apply_filters('pre_link_name', $link_name); |
305 |
|
306 | if( trim( $link_url ) == '' ) |
307 | return 0; |
308 | $link_url = apply_filters('pre_link_url', $link_url); |
309 |
|
310 | if ( empty($link_rating) ) |
311 | $link_rating = 0; |
312 | else |
313 | $link_rating = (int) $link_rating; |
314 |
|
315 | if ( empty($link_image) ) |
316 | $link_image = ''; |
317 | $link_image = apply_filters('pre_link_image', $link_image); |