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			is_protected_meta › WordPress Function
Since3.1.3
Deprecatedn/a
› is_protected_meta ( $meta_key, $meta_type = '' )
| Parameters: (2) | 
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| Returns: | 
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| Defined at: | 
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| Codex: | 
Determines whether a meta key is considered protected.
Related Functions: is_protected_endpoint, is_protected_ajax_action, _deprecated_argument, register_term_meta, populate_site_meta
	Source
function is_protected_meta( $meta_key, $meta_type = '' ) {
	$sanitized_key = preg_replace( "/[^\x20-\x7E\p{L}]/", '', $meta_key );
	$protected     = strlen( $sanitized_key ) > 0 && ( '_' === $sanitized_key[0] );
	/**
	 * Filters whether a meta key is considered protected.
	 *
	 * @since 3.2.0
	 *
	 * @param bool   $protected Whether the key is considered protected.
	 * @param string $meta_key  Metadata key.
	 * @param string $meta_type Type of object metadata is for. Accepts 'blog', 'post', 'comment', 'term',
	 *                          'user', or any other object type with an associated meta table.
	 */
	return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type );
}