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php学习笔记之 函数声明(二)_PHP

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Release: 2016-06-01 12:16:57
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复制代码 代码如下:
/*
* 1.内部函数:PHP可以在函数内部再声明函数
* 目的就是在函数内部调用
* 用来帮助外部函数完成一些子功能
*
* 2.递归函数:在自己内部调用自己的函数名
*
* 3.重用函数
*
* require:用于静态包含
* include:用于动态包含
* require_once:用于静态包含,只包含一次
* include_once:用于动态包含,只包含一次
*
* 4.一些系统函数的使用
* 资源=opendir("目录名")
* readdir(资源)
*
*
*/
//内部函数
function score($php,$java,$dotnet)
{
function php($php)
{
if($php>60)
return "及格";
else
return "不及格";
}
function java($java)
{
if($java>60)
return "及格";
else
return "不及格";
}
function dotnet($dotnet)
{
if($dotnet>60)
return "及格";
else
return "不及格";
}
$total=$php+$java+$dotnet;
$agv=$total/3;
echo "你的php成绩是{$php}分,".php($php)."
";
echo "你的java成绩是{$java}分,".java($java)."
";
echo "你的dotnet成绩是{$dotnet}分,".dotnet($dotnet)."
";
echo "你的总分是:{$total}
";
echo "你的平均分是:{$agv}
";
}
score(50,90,70);
//递归函数
function demo($num)
{
echo $num."
";
if($num>0)
demo($num-1);
else
echo "--------------------------------
";
echo $num."
";
}
demo(10);
function total($dirname,&$dirnum,&$filename)
{
$dir=opendir($dirname);
readdir($dir)."
";
readdir($dir)."
";
while($filename=readdir($dir))
{
$newfile=$dirname."/".$filename;
echo $filename."
";
if(is_dir($filename
}
}
$dirnum=0;
$filenum=0;
total("c:/windows",$dirnum,$filenum);
echo "目录总数:".$dirnum."
";
echo "文件总数:".$filenum."
";
?>
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