PHP常用技巧总结,php总结
PHP文件读取函式 //文件读取函式 function PHP_Read($file_name) { $fd=fopen($file_name,r); while($bufline=fgets($fd, 4096)){ $buf.=$bufline; } fclose($fd); return $buf; } ?> 文件写入函式 //文件写入函式 function PHP_Write($file_name,$data,$method=”w”) { $filenum=@fopen($file_name,$method); flock($filenum,LOCK_EX); $file_data=fwrite($filenum,$data); fclose($filenum); return $file_data; } ?> 静态页面生成函式 //静态页面生成函式 function phptohtm($filefrom,$fileto,$u2u=1){ if($u2u==1){ $data=PHP_Read($filefrom); }else{ $data=$filefrom; } PHP_Write($fileto,$data); return true; } ?> 指定条件信息数量检索函式 //指定条件信息数量检索函式 function rec_exist($table,$where){ $query=”select count(*) as num from $table “.$where; $result=mysql_query($query) or die(nerror(1)); $rowcount=mysql_fetch_array($result); $num=$rowcount["num"]; if ($num==0){ return false; } return $num; } ?> 目录删除函式 //目录删除函式 function del_DIR($directory){ $mydir=dir($directory); while($file=$mydir->read()){ if((is_dir(“$directory/$file”)) AND ($file!=”.”) AND ($file!=”..”)){ del_DIR(“$directory/$file”); }else{ if(($file!=”.”) AND ($file!=”..”)){ unlink(“$directory/$file”); //echo “unlink $directory/$file ok “; } } } $mydir->close(); rmdir($directory); //echo “rmdir $directory ok “; } ?> 目录名称合法性检测函式 //目录名称合法性检测 function isen($str){ $ret=”"; for($i=0;$i $p=ord(substr($str,$i,1)); if(($p<48 & $p!=45 & $p!=46) || ($p>57 & $p<65) || ($p>90 & $p<97 & $p!=95) || $p>122){ nerror(“不符合规范!”); } $ret.=chr($p); } return $ret; } ?> PHP分页函数 //分页函数 function splitlist($HALT,$LRLIST,$ECHOCNT,$paper,$table,$where,$page_id,$userid){ global $splitstr,$sumcnt; if($paper==”" || $sumcnt==”"){ $query = “select count(*) as num from $table $where”; $result = mysql_query($query); $row = mysql_fetch_array($result); $sumcnt=$row["num"]; if($sumcnt==0){ nerror(“该版内还没有选择发布新闻 !”); } $paper=1; } $sumpaper=($sumcnt-$sumcnt%$ECHOCNT)/$ECHOCNT; if(($sumcnt%$ECHOCNT)!=0) $sumpaper+=1; if($sumpaper==1 && $HALT==0) return($where); $enwhere=base64_encode(base64_encode($where)); if(($LRLIST*2+1) < $sumpaper){ if(($paper-$LRLIST) < 2){ $tract=1; $sub=$LRLIST*2+1; }else if(($paper+$LRLIST) >= $sumpaper){ $tract=$sumpaper-($LRLIST*2); $sub=$sumpaper; }else{ $tract=$paper-$LRLIST; $sub=$paper+$LRLIST; } }else{ $tract=1; $sub=$sumpaper; } $uppaper=$paper-1; $downpaper=$paper+1; $startcnt=($paper-1)*$ECHOCNT; $where.=” limit ${ startcnt },${ ECHOCNT }”; if($tract > 1) { $splitstr=”【 << “; } else $splitstr=”【 << “; for($i=$tract;$i<=$sub;$i++){ if ($i!=$paper) $splitstr.=”".$i.” “; else $splitstr.=”".$i.” “; } if ($sub!=$sumpaper) $splitstr.=”>> 】”; else $splitstr.=”>> 】”; return($where); } ?> PHP关于分页函式的使用说明 PHP图片文件上传函式 //图片文件上传函式 function upload_img($UploadFile,$UploadFile_name,$UploadFile_size,$UploadPath,$max_size=64){ //$TimeLimit=60; //设置超时限制时间 缺省时间为 30秒 设置为0时为不限时 //set_time_limit($TimeLimit); if(($UploadFile!= “none” )&&($UploadFile != “” )){ $FileName=$UploadPath.$UploadFile_name; if($UploadFile_size <1024){ $FileSize=”(string)$UploadFile_size” . “字节”; }elseif($UploadFile_size <(1024 * $max_size)){ $FileSize=number_format((double)($UploadFile_size / 1024), 1) . ” KB”; }else{ nerror(“文件超过限制大小!”); } //{ //$FileSize=”number_format((double)($UploadFile_size” / (1024 * 1024)), 1) . ” MB”; // } if(!file_exists($FileName)){ if(copy($UploadFile,$FileName)){ return “$UploadFile_name ($FileSize)”; }else{ nerror(“文件 $UploadFile_name 上载失败!”); } unlink($UploadFile); }else{ nerror(“文件 $UploadFile_name 已经存在!”); } //set_time_limit(30); //恢复缺省超时设置 } } 以下是一些小技巧: PHP如何判断ip地址合法性 if(!strcmp(long2ip(sprintf(“%u”,ip2long($ip))),$ip)) echo “is ipn”; —- email的正则判断 eregi(“^[_.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z_-]+.)+[a-zA-Z]$”, $email); 检测ip地址和mask是否合法的例子 $ip = ’192.168.0.84′; $mask = ’255.255.255.0′; $network = ’192.168.0′; $ip = ip2long($ip); $mask = ip2long($mask); $network = ip2long($network); if( ($ip & $mask) == $network) echo “valid ip and maskn”; ?> —- PHP文件下载头部输出如何设定 header(“Content-type: application/x-download”); header(“Content-Disposition: attachment; filename=$file_download_name;”); header(“Accept-Ranges: bytes”); header(“Content-Length: $download_size”); echo ‘xxx’ PHP用header输出ftp下载方式,并且支持断点续传 一个例子: header(‘Pragma: public’); header(‘Cache-Control: private’); header(‘Cache-Control: no-cache, must-revalidate’); header(‘Accept-Ranges: bytes’); header(‘Connection: close’); header(“Content-Type: audio/mpeg”); header(“Location:ftp://download:1bk3l4s3k9s2@232.2.22.22/2222/web技术开发知识库/cn_web.rmvb”); PHP正则匹配中文 ereg(“^[".chr(0xa1)."-".chr(0xff)."]+$”, $str); 批量替换文本里面的超级链接 function urlParse($str = ”){ if (” == $str) return $str; $types = array(“http”, “ftp”, “https”); $replace = << ”.htmlentities(’1′).htmlentities(’2′).” EOPHP; $ret = $str; while(list(,$type) = each($types)){ $ret = preg_replace(“|($type://)([^s]*)|ie “, $replace, $ret); } return $ret; }

Load balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.

The article discusses PHP, detailing its full form, main uses in web development, comparison with Python and Java, and its ease of learning for beginners.

PHP handles form data using $\_POST and $\_GET superglobals, with security ensured through validation, sanitization, and secure database interactions.

The article compares PHP and ASP.NET, focusing on their suitability for large-scale web applications, performance differences, and security features. Both are viable for large projects, but PHP is open-source and platform-independent, while ASP.NET,

PHP's case sensitivity varies: functions are insensitive, while variables and classes are sensitive. Best practices include consistent naming and using case-insensitive functions for comparisons.


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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
