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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 |
|---|---|
| 735 | // New-style shortcode with the caption inside the shortcode with the link and image tags. |
| 736 | if ( ! isset( $attr['caption'] ) ) { |
| 737 | if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) { |
| 738 | $content = $matches[1]; |
| 739 | $attr['caption'] = trim( $matches[2] ); |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | // Allow plugins/themes to override the default caption template. |
| 744 | $output = apply_filters('img_caption_shortcode', '', $attr, $content); |
| 745 | if ( $output != '' ) |
| 746 | return $output; |
| 747 | |
| 748 | extract(shortcode_atts(array( |
| 749 | 'id' => '', |
| 750 | 'align' => 'alignnone', |
| 751 | 'width' => '', |
| 752 | 'caption' => '' |
| 753 | ), $attr)); |