php学习之旅 (6) 函数

jiang1799

php的强大主要得益于函数,php中有超过700个的内置函数.
我主要介绍的是php的自定义函数
关于php的内置函数,大家可以去这里看看http://www.w3schools.com/php/default.asp
1.简单函数
<?php
function writeName()
{
echo "Kai Jim Refsnes";
}
echo "My name is ";
writeName();
?>
输出 My name is Kai Jim Refsnes
2.带参数的函数
<?php
function writeName($fname,$punctuation)
{
echo $fname . " Refsnes" . $punctuation . "<br />";
}
echo "My name is ";
writeName("Kai Jim",".");
echo "My sister's name is ";
writeName("Hege","!");
echo "My brother's name is ";
writeName("Ståle","?");
?>
输出
My name is Kai Jim Refsnes.
My sister's name is Hege Refsnes!
My brother's name is Ståle Refsnes?

3.有返回值的函数

<?php
function add($x,$y)
{
$total=$x+$y;
return $total;
}
echo "1 + 16 = " . add(1,16);
?>
输出
1 + 16 = 17