Replace Apostrophe with Space

// Add Shortcode
function srp( $atts ) {

	// Attributes
	$atts = shortcode_atts(
		array(
			'titleofpost' => '',
		),
		$atts
	);

	$str = str_replace(array('''), ' ', $str); 
	return $str;

}
add_shortcode( 'searchreplacepaul', 'srp' );