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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 |
|---|---|
| 630 | // New-style shortcode with the caption inside the shortcode with the link and image tags. |
| 631 | if ( ! isset( $attr['caption'] ) ) { |
| 632 | if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) { |
| 633 | $content = $matches[1]; |
| 634 | $attr['caption'] = trim( $matches[2] ); |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | // Allow plugins/themes to override the default caption template. |
| 639 | $output = apply_filters('img_caption_shortcode', '', $attr, $content); |
| 640 | if ( $output != '' ) |
| 641 | return $output; |
| 642 | |
| 643 | extract(shortcode_atts(array( |
| 644 | 'id' => '', |
| 645 | 'align' => 'alignnone', |
| 646 | 'width' => '', |
| 647 | 'caption' => '' |
| 648 | ), $attr, 'caption')); |