初学者学习PHP开发应该掌握几段精华代码(1)(5)

＜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＞＜font color='red'＞\n");
    print("＜TH＞文件名＜/TH＞\n");
    print("＜TH＞文件的大小＜/TH＞\n");
    print("＜/font＞＜/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＞
PHP相关信息
＜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"."＜br＞");
    }
    //双精度数判断
    $Temperature = 15.23;
    if(is_double($Temperature))
    {
        print("Temperature is a double"."＜br＞");
    }
    //整数判断
    $PageCount = 2234;
    if(is_integer($PageCount))
    {
        print("$PageCount is an integer"."＜br＞");
    }
    //对象判断
    class widget
    {
        var $name;
        var $length;
    }
    $thing = new widget;
    if(is_object($thing))
    {
        print("thing is an object"."＜br＞");
    }
    //字符判断
    $Greeting = "Hello";
    if(is_string($Greeting))
    {
        print("Greeting is a string"."＜br＞");
    }
?＞
＜/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 "＜br＞＜br＞\n";         
echo "文件 $Upfile_name 已上载成功！";
echo "＜br＞＜br＞\n";
echo "文件位置：$FileName";
echo "＜br＞＜br＞\n";
echo "文件大小：$FileSize";
echo "＜br＞＜br＞\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＞