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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 |
|---|---|
| 1474 | * |
| 1475 | * @since 2.6.0 |
| 1476 | * |
| 1477 | * @see img_caption_shortcode() |
| 1478 | * |
| 1479 | * @param string $output The caption output. Default empty. |
| 1480 | * @param array $attr Attributes of the caption shortcode. |
| 1481 | * @param string $content The image element, possibly wrapped in a hyperlink. |
| 1482 | */ |
| 1483 | $output = apply_filters( 'img_caption_shortcode', '', $attr, $content ); |
| 1484 | if ( $output != '' ) |
| 1485 | return $output; |
| 1486 | |
| 1487 | $atts = shortcode_atts( array( |
| 1488 | 'id' => '', |
| 1489 | 'align' => 'alignnone', |
| 1490 | 'width' => '', |
| 1491 | 'caption' => '', |
| 1492 | 'class' => '', |