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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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193 |
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194 | global $wpdb; |
195 |
|
196 | $type_column = esc_sql($meta_type . '_id'); |
197 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
198 | // expected_slashed ($meta_key) |
199 | $meta_key = stripslashes($meta_key); |
200 | $meta_value = stripslashes_deep($meta_value); |
201 |
|
202 | $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); |
203 | if ( null !== $check ) |
204 | return (bool) $check; |
205 |
|
206 | $_meta_value = $meta_value; |
207 | $meta_value = maybe_serialize( $meta_value ); |
208 |
|
209 | $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); |
210 |
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211 | if ( !$delete_all ) |