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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 |
|---|---|
| 5154 | * Filter the mime type icon. |
| 5155 | * |
| 5156 | * @since 2.1.0 |
| 5157 | * |
| 5158 | * @param string $icon Path to the mime type icon. |
| 5159 | * @param string $mime Mime type. |
| 5160 | * @param int $post_id Attachment ID. Will equal 0 if the function passed |
| 5161 | * the mime type. |
| 5162 | */ |
| 5163 | return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id ); |
| 5164 | } |
| 5165 | |
| 5166 | /** |
| 5167 | * Check for changed slugs for published post objects and save the old slug. |
| 5168 | * |
| 5169 | * The function is used when a post object of any type is updated, |
| 5170 | * by comparing the current and previous post objects. |
| 5171 | * |
| 5172 | * If the slug was changed and not already part of the old slugs then it will be |