PHP常用技巧总结，学习php的朋友可以收藏下

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

 
/* 
#### 检索分页函式 #### 
Int $HALT C 检索结果仅分1页时是否(1/0)显示页码条 
Int $LRLIST C (页码条显示页码数-1)/2 
Int $ECHOCNT C 检索时每页显示记录的数量 
Int $paper C 页数，预提取：$paper=$HTTP_GET_VARS[paper]; 
Varchar $table C 数据表名,预附值：$table=”db.table”; 
Varchar $where C 检索条件，预附值：$where=”where field='value'”; 
Varchar $enwhere C 将原$where进行两次base64_encode()编码后以GET的方式提交 
Varchar $splitstr C 页码条输出字串，执行函式后在相应的位置执行 echo $splitstr; 
函式调用前需获取变量 - 
$paper=$HTTP_GET_VARS[paper]; 
$sumcnt=$HTTP_GET_VARS[sumcnt]; 
$enwhere=$HTTP_GET_VARS[enwhere]; 
Return (Varchar $where) C 分页后检索语句的检索条件 
注意：本函式需调用出错处理函式 nerror($error); 
*/ 
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: $download_size”);
echo ‘xxx'
PHP用header输出ftp下载方式,并且支持断点续传
一个例子:
header(‘Pragma: public');
header(‘Cache-Control: private');
header(‘Cache-Control: no-cache, must-revalidate');
header(‘Accept-Ranges: bytes');
header(‘Connection: close');
header(“Content-Type: audio/mpeg”);
header(“Location:ftp://download:[email protected]/2222/web技术开发知识库/cn_web.rmvb”);
PHP正则匹配中文
ereg(“^[".chr(0xa1)."-".chr(0xff)."]+$”, $str);
批量替换文本里面的超级链接
function urlParse($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;
}