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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 |
---|---|
4457 | if ( isset($types[$wilds[0]])) { |
4458 | $icon = $types[$wilds[0]]; |
4459 | if ( !is_numeric($mime) ) |
4460 | wp_cache_add("mime_type_icon_$mime", $icon); |
4461 | break; |
4462 | } |
4463 | } |
4464 | } |
4465 |
|
4466 | return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id ); // Last arg is 0 if function pass mime type. |
4467 | } |
4468 |
|
4469 | /** |
4470 | * Checked for changed slugs for published post objects and save the old slug. |
4471 | * |
4472 | * The function is used when a post object of any type is updated, |
4473 | * by comparing the current and previous post objects. |
4474 | * |
4475 | * If the slug was changed and not already part of the old slugs then it will be |