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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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195 |
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196 | global $wpdb; |
197 |
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198 | $type_column = sanitize_key($meta_type . '_id'); |
199 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
200 | // expected_slashed ($meta_key) |
201 | $meta_key = wp_unslash($meta_key); |
202 | $meta_value = wp_unslash($meta_value); |
203 |
|
204 | $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); |
205 | if ( null !== $check ) |
206 | return (bool) $check; |
207 |
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208 | $_meta_value = $meta_value; |
209 | $meta_value = maybe_serialize( $meta_value ); |
210 |
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211 | $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); |
212 |
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213 | if ( !$delete_all ) |