sanitize_textarea_field() WordPress Function

The sanitize_textarea_field() function is a sanitization and validation function for textareas. The function first strips all tags from the textarea, then it runs the text through the wp_check_invalid_utf8() function to check for invalid UTF8 characters. Finally, the function strips any extra whitespace from the textarea. This function is useful for ensuring that textareas contain only valid UTF8 characters and no extra whitespace.

sanitize_textarea_field( string $str ) #

function sanitize_textarea_field( $str ) {
	$filtered = _sanitize_text_fields( $str, true );

	/**
	 * Filters a sanitized textarea field string.
	 *
	 * @since 4.7.0
	 *
	 * @param string $filtered The sanitized string.
	 * @param string $str      The string prior to being sanitized.
	 */
	return apply_filters( 'sanitize_textarea_field', $filtered, $str );
}