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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 |
|---|---|
| 4467 | if ( isset($types[$wilds[0]])) { |
| 4468 | $icon = $types[$wilds[0]]; |
| 4469 | if ( !is_numeric($mime) ) |
| 4470 | wp_cache_add("mime_type_icon_$mime", $icon); |
| 4471 | break; |
| 4472 | } |
| 4473 | } |
| 4474 | } |
| 4475 | |
| 4476 | return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id ); // Last arg is 0 if function pass mime type. |
| 4477 | } |
| 4478 | |
| 4479 | /** |
| 4480 | * Checked for changed slugs for published post objects and save the old slug. |
| 4481 | * |
| 4482 | * The function is used when a post object of any type is updated, |
| 4483 | * by comparing the current and previous post objects. |
| 4484 | * |
| 4485 | * If the slug was changed and not already part of the old slugs then it will be |