php检查日期

= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59))
            return true;
        else
            return false;
    }
    return false;
}

function DateDiff($date1, $date2, $unit = "") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天
    switch ($unit) {
        case 's':
            $pidend = 1;
            break;
        case 'i':
            $pidend = 60;
            break;
        case 'h':
            $pidend = 3600;
            break;
        case 'd':
            $pidend = 86400;
            break;
        default:
            $pidend = 86400;
    }
    $time1 = strtotime($date1);
    $time2 = strtotime($date2);
    if ($time1 && $time2)
        return (float)($time1 - $time2) / $pidend;
    return false;
}

?>


PHP重定向
window.location ="$PHP_SELF";";
方法三：echo "";

?>


获取访问者浏览器



获取访问者操作系统



文件格式类
 'image/gif',
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'jpe' => 'image/jpeg',
'bmp' => 'image/bmp',
'png' => 'image/png',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'pict' => 'image/x-pict',
'pic' => 'image/x-pict',
'pct' => 'image/x-pict',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'psd' => 'image/x-photoshop',

'swf' => 'application/x-shockwave-flash',
'js' => 'application/x-javascrīpt',
'pdf' => 'application/pdf',
'ps' => 'application/postscrīpt',
'eps' => 'application/postscrīpt',
'ai' => 'application/postscrīpt',
'wmf' => 'application/x-msmetafile',

'css' => 'text/css',
'htm' => 'text/html',
'html' => 'text/html',
'txt' => 'text/plain',
'xml' => 'text/xml',
'wml' => 'text/wml',
'wbmp' => 'image/vnd.wap.wbmp',

'mid' => 'audio/midi',
'wav' => 'audio/wav',
'mp3' => 'audio/mpeg',
'mp2' => 'audio/mpeg',

'avi' => 'video/x-msvideo',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'qt' => 'video/quicktime',
'mov' => 'video/quicktime',

'lha' => 'application/x-lha',
'lzh' => 'application/x-lha',
'z' => 'application/x-compress',
'gtar' => 'application/x-gtar',
'gz' => 'application/x-gzip',
'gzip' => 'application/x-gzip',
'tgz' => 'application/x-gzip',
'tar' => 'application/x-tar',
'bz2' => 'application/bzip2',
'zip' => 'application/zip',
'arj' => 'application/x-arj',
'rar' => 'application/x-rar-compressed',

'hqx' => 'application/mac-binhex40',
'sit' => 'application/x-stuffit',
'bin' => 'application/x-macbinary',

'uu' => 'text/x-uuencode',
'uue' => 'text/x-uuencode',

'latex'=> 'application/x-latex',
'ltx' => 'application/x-latex',
'tcl' => 'application/x-tcl',

'pgp' => 'application/pgp',
'asc' => 'application/pgp',
'exe' => 'application/x-msdownload',
'doc' => 'application/msword',
'rtf' => 'application/rtf',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',
'mdb' => 'application/x-msaccess',
'wri' => 'application/x-mswrite',
);

?>


php生成excel文档



时间比较问题
举一个简单例子说明:比如一个论坛对当天发表的贴子用new图片标记一下。
方法一：
rows[$i][date]中为数据库中datetime字段值.
$today=time();
$theDay=date("Y-m-d H:i:s",$today-24*3600);
$newTag=$db->rows[$i][date]>=$theDay?"":"";
//方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"":"";

?>

//提取页面和浏览器提交的变量，作用相当于使PHP.INI开了全局变量


//读取文件函数


//写入文件函数


//页面快速转向
nnn";
print "n";
print "n";
print "
nn";
print "n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print "
 
n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " n";
print " 
页面转向提示信息
$info
n";
print " 如果你的浏览器不支持自动跳转,请按这里
 
n";
print "n";
exit;
?>


产生随机字符串函数


截取一定长度的字符串（该函数对GB2312使用有效）
 $length) {
               if($sss){
                      $length=$length - 3;
                      $addstr=@# ...@#;
                }
  for($i = 0; $i < $length; $i++) {
   if(ord($string[$i]) > 127) {
    $wordscut .= $string[$i].$string[$i + 1];
    $i++;
   } else {
    $wordscut .= $string[$i];
   }
  }
  return $wordscut.$addstr;
}
return $string;
}

?>

取得客户端IP地址


判断邮箱地址


分页（两个函数配合使用）
".$totalpage."页  ";
    $linkNum =4;
    $start = ($page-round($linkNum/2))>0 ? ($page-round($linkNum/2)) : "1";
    $end   = ($page+round($linkNum/2))<$totalpage ? ($page+round($linkNum/2)) : $totalpage;
    $prestart=$start-1;
    $nextend=$end+1;
    if($page<>1) 
$out .= "第一页 ";
    if($start>1)
$out.="..<< ";

for($t=$start;$t<=$end;$t++)
    {
     $out .= ($page==$t) ? "[".$t."] " : "$t ";
    }
if($end<$totalpage)
$out.=">>..";
    if($page<>$totalpage)
   $out .= " 最后页";
   return $out;
}

?>

获取新插入数据的ID




//获得当前的脚本网址



//把全角数字转为半角数字




//去除HTML标记
",">",$txt);
        $txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
        return $txt;
}

?>



//相对路径转化成绝对路径



//取得所有链接
"' ]+)["|']?s*[^>]*>([^>]+)/i',$code,$arr); 
        return array('name'=>$arr[2],'url'=>$arr[1]); 
}

?>



//HTML表格的每行转为CSV格式数组
]*?>'si",'"',$table);
        $table = str_replace("",'",',$table);
        $table = str_replace("","{tr}",$table);
        //去掉 HTML 标记 
        $table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
        //去掉空白字符  
        $table = preg_replace("'([rn])[s]+'","",$table);
        $table = str_replace(" ","",$table);
        $table = str_replace(" ","",$table);

        $table = explode(",{tr}",$table);
        array_pop($table);
        return $table;
}

?>


//将HTML表格的每行每列转为数组，采集表格数据
]*?>'si","",$table);
        $table = preg_replace("']*?>'si","",$table);
        $table = preg_replace("']*?>'si","",$table);
        $table = str_replace("","{tr}",$table);
        $table = str_replace("","{td}",$table);
        //去掉 HTML 标记 
        $table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
        //去掉空白字符  
        $table = preg_replace("'([rn])[s]+'","",$table);
        $table = str_replace(" ","",$table);
        $table = str_replace(" ","",$table);
        
        $table = explode('{tr}', $table);
        array_pop($table);
        foreach ($table as $key=>$tr) {
                $td = explode('{td}', $tr);
                array_pop($td);
            $td_array[] = $td;
        }
        return $td_array;
}

?>



//返回字符串中的所有单词 $distinct=true 去除重复



//打印出为本PHP项目做出贡献的人员的清单