";echo "--------------";echo "
";/*PHP函数参数可以通过参数向函数传递信息。*/function familyName($fname) {	echo "$fname Zhang.
";}familyName("Li");familyName("Hong");familyName("Tao");familyName("Xiao Mei");familyName("Jian");echo "
";echo "--------------";echo "
";function familyName2($fname, $year) {	echo "$fname Zhang. Born in $year 
";}familyName2("Li", "1975");familyName2("Hong", "1978");familyName2("Tao", "1983");echo "
";echo "--------------";echo "
";/*PHP默认参数值*/function setHeight($minheight = 50) {	echo "The height is $minheight 
";}setHeight(350);setHeight();	//将使用默认值setHeight(136);setHeight(80);echo "
";echo "--------------";echo "
";/*PHP函数 - 返回值*/function sum($x, $y) {	$z = $x + $y;	return $z;}echo "5 + 10 = " . sum(5, 10) . "
";echo "7 + 13 = " . sum(7, 13) . "
";echo "2 + 4 = " . sum(2, 4);?>

　　

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