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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 |
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68 | ) ); |
69 |
|
70 | if ( ! $result ) |
71 | return false; |
72 |
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73 | $mid = (int) $wpdb->insert_id; |
74 |
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75 | wp_cache_delete($object_id, $meta_type . '_meta'); |
76 |
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77 | do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); |
78 |
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79 | return $mid; |
80 | } |
81 |
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82 | /** |
83 | * Update metadata for the specified object. If no value already exists for the specified object |
84 | * ID and metadata key, the metadata will be added. |
85 | * |
86 | * @since 2.9.0 |