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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 |
|---|---|
| 5104 | |
| 5105 | /** |
| 5106 | * Filters the attachment caption. |
| 5107 | * |
| 5108 | * @since 4.6.0 |
| 5109 | * |
| 5110 | * @param string $caption Caption for the given attachment. |
| 5111 | * @param int $post_id Attachment ID. |
| 5112 | */ |
| 5113 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
| 5114 | } |
| 5115 | |
| 5116 | /** |
| 5117 | * Retrieve thumbnail for an attachment. |
| 5118 | * |
| 5119 | * @since 2.1.0 |
| 5120 | * |
| 5121 | * @param int $post_id Optional. Attachment ID. Default 0. |
| 5122 | * @return string|false False on failure. Thumbnail file path on success. |