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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 |
---|---|
5185 |
|
5186 | /** |
5187 | * Filters the attachment caption. |
5188 | * |
5189 | * @since 4.6.0 |
5190 | * |
5191 | * @param string $caption Caption for the given attachment. |
5192 | * @param int $post_id Attachment ID. |
5193 | */ |
5194 | return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID ); |
5195 | } |
5196 |
|
5197 | /** |
5198 | * Retrieve thumbnail for an attachment. |
5199 | * |
5200 | * @since 2.1.0 |
5201 | * |
5202 | * @param int $post_id Optional. Attachment ID. Default 0. |
5203 | * @return string|false False on failure. Thumbnail file path on success. |