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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 |
---|---|
371 | if ( ! empty($meta['thumb']) ) { |
372 | // Don't delete the thumb if another attachment uses it |
373 | if (! $foo = $wpdb->get_row("SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE '%".$wpdb->escape($meta['thumb'])."%' AND post_id <> $postid")) |
374 | @ unlink(str_replace(basename($file), $meta['thumb'], $file)); |
375 | } |
376 |
|
377 | if ( ! empty($file) ) |
378 | @ unlink($file); |
379 |
|
380 | do_action('delete_attachment', $postid); |
381 |
|
382 | return $post; |
383 | } |
384 |
|
385 | function wp_get_single_post($postid = 0, $mode = OBJECT) { |
386 | global $wpdb; |
387 |
|
388 | $post = get_post($postid, $mode); |
389 | |