wp_pre_kses_less_than_callback() WordPress Function

The wp_pre_kses_less_than_callback() function is used to pre-filter content before it is passed through the kses post filter. This function is called by the wp_pre_kses() function. The function strips out all '<' characters and replaces them with '<'. This is done to prevent content from being passed to the kses filter that could potentially create security vulnerabilities.

wp_pre_kses_less_than_callback( string[] $matches ) #

function wp_pre_kses_less_than_callback( $matches ) {
	if ( false === strpos( $matches[0], '>' ) ) {
		return esc_html( $matches[0] );
	}
	return $matches[0];
}