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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 |
|---|---|
| 2855 | if ( isset($types[$wilds[0]])) { |
| 2856 | $icon = $types[$wilds[0]]; |
| 2857 | if ( !is_numeric($mime) ) |
| 2858 | wp_cache_set("mime_type_icon_$mime", $icon); |
| 2859 | break; |
| 2860 | } |
| 2861 | } |
| 2862 | } |
| 2863 | |
| 2864 | return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id ); // Last arg is 0 if function pass mime type. |
| 2865 | } |
| 2866 | |
| 2867 | /** |
| 2868 | * Checked for changed slugs for published posts and save old slug. |
| 2869 | * |
| 2870 | * The function is used along with form POST data. It checks for the wp-old-slug |
| 2871 | * POST field. Will only be concerned with published posts and the slug actually |
| 2872 | * changing. |
| 2873 | * |