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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 |
|---|---|
| 1540 | * @since 3.7.0 |
| 1541 | * |
| 1542 | * @see img_caption_shortcode() |
| 1543 | * |
| 1544 | * @param int $width Width of the caption in pixels. To remove this inline style, |
| 1545 | * return zero. |
| 1546 | * @param array $atts Attributes of the caption shortcode. |
| 1547 | * @param string $content The image element, possibly wrapped in a hyperlink. |
| 1548 | */ |
| 1549 | $caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content ); |
| 1550 | |
| 1551 | $style = ''; |
| 1552 | if ( $caption_width ) |
| 1553 | $style = 'style="width: ' . (int) $caption_width . 'px" '; |
| 1554 | |
| 1555 | $html = ''; |
| 1556 | if ( $html5 ) { |
| 1557 | $html = '<figure ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">' |
| 1558 | . do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption></figure>'; |