สอบถามเกี่ยวกับ ERROR ของ Function ค่ะ ไม่ทราบว่าจะต้องแก้ยังไงอะค่ะ

<?php
function displaydate($x) {
	$thai_m=array( "January","February","March","April","May","June","July","August","September","October","November","December" );
	$date_array=explode("-",$x) ;
	$y=$date_array[0];
	$m=$date_array[1]-1;
	$d=$date_array[2];
	
	$m=$thai_m[$m];
	$y=$y;
	
	$displaydate="$d $m $y";
	return $displaydate;
}
function checkemail($checkemail) {
	return true;
	return eregi('^[a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+.([a-zA-Z]{2,4})$',str_replace(" ","",$checkemail));
}	
?>