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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 |
|---|---|
| 1568 | * @since 3.7.0 |
| 1569 | * |
| 1570 | * @see img_caption_shortcode() |
| 1571 | * |
| 1572 | * @param int $width Width of the caption in pixels. To remove this inline style, |
| 1573 | * return zero. |
| 1574 | * @param array $atts Attributes of the caption shortcode. |
| 1575 | * @param string $content The image element, possibly wrapped in a hyperlink. |
| 1576 | */ |
| 1577 | $caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content ); |
| 1578 | |
| 1579 | $style = ''; |
| 1580 | if ( $caption_width ) { |
| 1581 | $style = 'style="max-width: ' . (int) $caption_width . 'px" '; |
| 1582 | } |
| 1583 | |
| 1584 | if ( $html5 ) { |
| 1585 | $html = '<figure ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">' |
| 1586 | . do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption></figure>'; |