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身份證字號檢查
function id_num_check($id_num)
{
	$id_firsts	= array("A" => "10", "B" => "11", "C" => "12", "D" => "13", "E" => "14",
				"F" => "15", "G" => "16", "H" => "17", "I" => "34", "J"	=> "18",
				"K" => "19", "L" => "20", "M" => "21", "N" => "22", "O"	=> "35",
				"P" => "23", "Q" => "24", "R" => "25", "S" => "26", "T"	=> "27",
				"U" => "28", "V" => "29", "W" => "32", "X" => "30", "Y"	=> "31",
				"Z" => "33");
	if (strlen($id_num) != 10)
	{
		return false;
	}
	
	$id_first	= substr($id_num, 0, 1);
	$id_first_map	= $id_firsts[$id_first];
	$id_chk_val	= substr($id_first_map,0,1) * 1;
	$id_chk_val	+= substr($id_first_map,1,1) * 9;
	for ($i=1; $i<9; $i++)
	{
		$id_chk_val	+= substr($id_num,$i,1) * (9-$i);
	}
	$id_chk_val	= $id_chk_val % 10;
	$id_chk_val	= 10 - $id_chk_val;
	$id_chk_val	= $id_chk_val % 10;
	$id_num_last	= substr($id_num,-1);
	if ($id_chk_val != $id_num_last)
	{
		return false;
	}
	return true;
}