同时,有很多函数是可以有多种方法实现的,这需要灵活运用。只有记住了这些函数,才能开发出动态的网站;也只有多练习,整个网站开发一次,才能熟练的进行下次的开发,才发现自己的不足并改进。
很多方法都可以改进,比如这个计数器:
实例24 计数器
复制代码 代码如下:
//计数器
function countx($file="count.dat"){
if(file_exists($file)){
$fp=fopen($file,"r");
$numx=fgets($fp,10);
fclose($fp);
$numx++;
//以上四行代码可以用一条表达式代替:$numx=file_get_contents($file)+1;
}
else{
$numx=1;}
file_put_contents($file,$numx);//当文件不存在时,这函数会自动创建文件,而且会自动把参数转成字符串写入。
echo $numx;
/*整个函数体可以用两条表达式代替:file_exists($file)?file_put_contents($file,file_get_contents($file)+1):file_put_contents($file,"1");readfile($file);
*/
}
//函数调用
countx();
?>
实现方法多的是,大家多思考一下吧。
最后这个例子,是调试时用到的计算代码运行所用的时间,单位为秒以五位小数输出,相当于搜索引擎的搜索时间,常用于SQL等优化,代码如下:
实例25 计算代码运行所用时间,优化代码
复制代码 代码如下:
$ftime=microtime();
countx();//此处放要计算运行所用时间的代码,这是调用上一例的函数。
$ftime=number_format((microtime()-$ftime),5);
echo $ftime;
?>
我这本教程基本以实例为主,很少讲述,这些代码不难,函数也是精挑细选的,我的目的是能快速用起来,比如能处理中文,我如果照搬书上说的只能处理英文的函数,那有什么用呢?或者我把你用不到的函数拿出来,那也是白费时间的。
我没有讲简单的语法,不过我相信大家通过有代表性实例的练习,语法和基础都不成问题的。还有就是这本教程是我针对初、中级的人的,开发实用的网站足够了。我以后还会出高级一点的教程,比如讲sock、XML、ZIP、PDF、Mail等类库开发,以及编写自己的CMS等。我力求最快明白,不行也要更快明白吧!
再次谢谢大家,这个初中级教程就这到这里了,现在比较忙,大家也可以到我的网站www.kuphp.com逛逛,互相学习一下!
如果大家看的比较累,这里有打包的pdf与doc版 下载地址 http://www.bitsCN.com/books/32601.html

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