初学者学习PHP开发应该掌握的几段精华代码

<HTML>
<HEAD>
<TITLE>经典循环例子</TITLE>
</HEAD>
<BODY>
<?
 for($counter = 1; $counter <= 6; $counter++) //循环6次
 {
 print("counter is $counter \n"); //打印6次
 }
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>for的高级运用</TITLE>
</HEAD>
<BODY>
<?
 /*
 ** 打印必要的说明文字
 */
 print("距离星期一还有几天？\n");
 print("<OL>\n");
 for($currentDate = date("U"); //定义$currentDate时间格式
 date("l", $currentDate) != "Monday"; //判断是不是当前系统时间是Monday
 $currentDate += (60 * 60 * 24)) //当前时间加上1天
 {
 /*
 ** 打印时间名称
 */
 print("<LI>" . date("l", $currentDate) . "\n");
 }

 print("</OL>\n");
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>简单的函数</TITLE>
</HEAD>
<BODY>

<?
 function printBold($inputText) //定义function printBold（）
 {
 print("" . $inputText . ""); ////打印$inputText
 }
 print("这行没有加重！ \n"); //直接打印字符串
 printBold("这行加重了！！！"); //调用function printBold()函数
 print(" \n");
 print("这行没有加重！ \n"); //直接打印字符串
?>

</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>有返回值的函数</TITLE>
</HEAD>
<BODY>

<?
 function makeBold($inputText) //定义function makeBold()函数
 {
 $boldedText = "";
 $boldedText .= $inputText;
 $boldedText .= "";
 return($boldedText); //返回变量$boldedText
 }
 print("这行没有加重！！！ \n"); //直接打印字符串
 print(makeBold("这行被加重了！！！") . " \n");//调用function makeBold()函数
 print("这行没有加重！！！ \n"); //直接打印字符串
?>
</SIZE>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>有默认参数的函数</TITLE>
</HEAD>
<BODY>

<?
 function printColored($Text, $Color="black") //定义function函数
 {
 print("$Text"); //获取字符串的内容和颜色
 }
 printColored("这是黑颜色的字！"); //调用function函数
 print(" \n");
 printColored("这是蓝颜色的字！", "blue"); //调用function函数
 print(" \n");
?>
</SIZE>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>判断整数</TITLE>
</HEAD>
<BODY>
<?
 function checkInteger($Number)
 {
 if($Number > 1)
 {
 /* 整数减1仍然是整数 */
 return(checkInteger($Number-1));
 }
 elseif($Number < 0)
 {
 /* 对于一个负数，*/
 /* 可以分析它的绝对值*/
 return(checkInteger((-1)*$Number-1));//取绝对值，把负数按整数分析
 }
 else
 {
 if(($Number > 0) AND ($Number < 1))
 {
 return("当然不是");
 }
 else
 {
 /* 0 和 1 是整数 */
 /* 根据相关数学定义 */
 return("是的");
 }
 }
 }
 print("0是整数吗？" .
 checkInteger(0) . " \n");
 print("7是整数吗？ " .
 checkInteger(7) . " \n");
 print("3.5呢？" . checkInteger(3.5) . " \n");
 print("那么-5呢？" . checkInteger(-5) . " \n");
 print("还有-9.2？" . checkInteger(-9.2) . " \n");
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>初始化数组</TITLE>
</HEAD>

<?
 $monthName = array(1=>"January", "February", "March",//初始化一个数组
 "April", "May", "June", "July", "August",
 "September", "October", "November", "December");
 print(" 英语的“5月”是 $monthName[5] 。 \n");//打印数组中的第6个元素
?>

</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>获取数组中的元素</TITLE>
</HEAD>
<?
 $monthName = array(
 /*定义$monthName[1]到$monthName[12]*/
 1=>"January", "February", "March",
 "April", "May", "June",
 "July", "August", "September",
 "October", "November", "December",
 /*定义$monthName["Jan"]到$monthName["Dec"]*/
 "Jan"=>"January", "Feb"=>"February",
 "Mar"=>"March", "Apr"=>"April",
 "May"=>"May", "Jun"=>"June",
 "Jul"=>"July", "Aug"=>"August",
 "Sep"=>"September", "Oct"=>"October",
 "Nov"=>"November", "Dec"=>"December",
 /*定义$monthName["Jan"]到$monthName["Dec"]*/
 "January"=>"January", "February"=>"February",
 "March"=>"March", "April"=>"April",
 "May"=>"May", "June"=>"June",
 "July"=>"July", "August"=>"August",
 "September"=>"September", "October"=>"October",
 "November"=>"November", "December"=>"December"
 );
 /*打印相关的元素*/
 print("Month 5 is " . $monthName[5]. " \n");
 print("Month Aug is " . $monthName["Aug"] . " \n");
 print("Month June is " . $monthName["June"] . " \n");
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>创建一个多维数组</TITLE>
</HEAD>
<?
 $Cities = array( //二维数组array（）
 "华北地区"=>array(
 "北京市",
 "天津市",
 "石家庄"
 ),
 "西北地区"=>array(
 "西安",
 "拉萨"
 )
 );
 print("华北地区: ".$Cities["华北地区"][0]); //打印$Cities["华北地区"][0]
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>实现表格状打印</TITLE>
</HEAD>
<BODY>
<?
 /*
 ** 数据表格化
 */

 print("<TABLE bgcolor='ffccoo' BORDER=\"1\">\n"); // 表格开始


 for($Row=1; $Row <= 12; $Row ++)
 {
 print("<TR>\n"); // 开始行

 // do each column
 for($Column=1; $Column <= 12; $Column ++)
 {
 print("<TD>");//开始列
 print($Row * $Column);//表格元素乘积
 print("</TD>");
 }

 print("</TR>\n"); // 行结束

 }

 print("</TABLE>\n"); // 表格结束

?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>查看PHP的环境变量</TITLE>
</HEAD>
<BODY>
<?
 print("你正在用文件的名字为： ");
 print(__FILE__);
 print(" \n");
 print("<hr>");
 print("你的操作系统为： ");
 print(PHP_OS);
 print("<hr>");
 print("你的php的版本为： ");
 print(PHP_VERSION)
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>打开本地或者远程文件</TITLE>
</HEAD>
<BODY>
<?
 print("<H3>通过http协议打开文件</H3>\n");
 // 通过 http 协议打开文件
 if(!($myFile = fopen("d:web/web/php/test/data.txt", "r")))
 {
 print("文件不能打开");
 exit;
 }
 while(!feof($myFile)) //循环
 {
 // 按行读取文件中的内容
 $myLine = fgetss($myFile, 255);
 print("$myLine \n");
 }
 // 关闭文件的句柄
 fclose($myFile);
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>读取文件内容</TITLE>
</HEAD>
<BODY>
<?
 // 打开文件同时打印文件的每一个字符
 if($myFile = fopen("data.txt", "r"))
 {
 while(!feof($myFile))
 {
 $myCharacter = fgetc($myFile);
 print($myCharacter);
 }
 fclose($myFile);
 }
?>
<? print("<hr>");?>
<?
 // 打开文件同时打印文件的每一行
 if($myFile = fopen("data.txt", "r"))
 {
 while(!feof($myFile))
 {
 $myLine = fgets($myFile, 255);
 print($myLine);
 }
 fclose($myFile);
 }
?>
<? print("<hr>");?>
<?
 /* 打开文件同时打印文件的每一行,
 同时去掉取回字符串中的 HTML 语言
 */
 if($myFile = fopen("data.txt", "r"))
 {
 while(!feof($myFile))
 {
 $myLine = fgetss($myFile, 255);
 print($myLine);
 }
 fclose($myFile);
 }
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>访问文件常见属性</TITLE>
</HEAD>
<BODY>
 
<?
 print("文件的所有者（UID 值）：");
 print(fileowner("data.txt")." ");
 print("文件的大小：");
 print(filesize("data.txt")." ");
 print("文件的类型：");
 print(filetype("data.txt")." ");
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>调用文本文件内容</TITLE>
</HEAD>
<BODY>
<CENTER>
<?
 // 打开文件同时，打印每一行
 $myFile = file( "data.txt");
 for($index = 0; $index < count($myFile); $index++)
 {
 print($myFile[$index]." ");
 }
?>
</CENTER>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>创建目录函数</TITLE>
</HEAD>
<BODY>
<?
 if(mkdir("myDir1", 0777)) //创建目录的函数
 {
 print("目录创建成功"); //目录建立成功
 }
 else
 {
 print("目录建立失败!"); //目录建立失败
 }
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>浏览目录</TITLE>
</HEAD>
<BODY>
<?
 // 使用表格浏览目录的结构
 print("<TABLE BORDER=\"1\">\n");
 // 创建表格的头
 print("<TR>\n");
 print("<TH>文件名</TH>\n");
 print("<TH>文件的大小</TH>\n");
 print("</TR>\n");
 $myDirectory = opendir("."); // 建立操作目录的句柄
 // 读出目录中的每一个子项
 while($entryName = readdir($myDirectory))
 {
 print("<TR>");
 print("<TD>$entryName</TD>");
 print("<TD ALIGN=\"right\">");
 print(filesize($entryName));
 print("</TD>");
 print("</TR>\n");
 }
 closedir($myDirectory); // 关闭目录
 print("</TABLE>\n");
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>PHP相关信息</TITLE>
</HEAD>
<BODY>
<?
phpinfo();
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>常用的数值判断函数</TITLE>
</HEAD>
<BODY>
<?
 //判断数组
 $colors = array("red", "blue", "green");
 if(is_array($colors))
 {
 print("colors is an array"." ");
 }
 //双精度数判断
 $Temperature = 15.23;
 if(is_double($Temperature))
 {
 print("Temperature is a double"." ");
 }
 //整数判断
 $PageCount = 2234;
 if(is_integer($PageCount))
 {
 print("$PageCount is an integer"." ");
 }
 //对象判断
 class widget
 {
 var $name;
 var $length;
 }
 $thing = new widget;
 if(is_object($thing))
 {
 print("thing is an object"." ");
 }
 //字符判断
 $Greeting = "Hello";
 if(is_string($Greeting))
 {
 print("Greeting is a string"." ");
 }
?>
</BODY>
</HTML>

<HTML>
<HEAD>
<TITLE>文件上传界面</TITLE>
</HEAD>
<BODY><TABLE><CENTER>
<?
if($UploadAction){
$UploadAction=0;
$TimeLimit=60;
/*设置超时限制时间默认时间为 30s，设置为0时为不限时 */
set_time_limit($TimeLimit);
If(($Upfile != "none")&&
($Upfile != ""))
{
$Filepath="d:\web\web\php\test"; //上载文件存放路径
$FileName=$Filepath.$Upfile_name;
if($Upfile_size <1024) //上载文件大小
{$FileSize = (string)$Upfile_size . "字节";}
elseif($Upfile_size <(1024 * 1024))
{
$FileSize = number_format((double)($Upfile_size / 1024), 1) . " KB";
}
else
{
$FileSize = number_format((double)($Upfile_size/(1024*1024)),1)."MB";
}
if(!file_exists($FileName))
{
if(copy($Upfile,$FileName))
{unlink($Upfile);
echo " \n";
echo "文件 $Upfile_name 已上载成功！";
echo " \n";
echo "文件位置：$FileName";
echo " \n";
echo "文件大小：$FileSize";
echo " \n";
}
else
{echo "文件 $Upfile_name上载失败！"; }
}
else
{echo "文件 $Upfile_name已经存在！"; }
}
else
{echo "你没有选择任何文件上载！"; }
set_time_limit(30); //恢复默认超时设置
}
?>
<FORM ENCTYPE = "multipart/form-data" NAME = "SubmitForm"
ACTION = "default.php" METHOD = "POST">
<INPUT TYPE = "hidden" NAME = "MAX_FILE_SIZE" VALUE ="1000000">
<INPUT TYPE = "hidden" NAME = "UploadAction" VALUE = "1">
<TR><TD><INPUT NAME = "Upfile" TYPE = "file" SIZE = "30"></TD>
</TR><TR><TD><INPUT NAME = "submit" VALUE = "提交" TYPE = "submit">
<INPUT NAME = "reset" VALUE = "重置" TYPE = "reset"></TD>
</TR></FORM></CENTER></TABLE>
</BODY>
</HTML>

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