本文為大家分享了多個php常用技巧，供大家參考，具體內容如下
1、PHP文件讀取函式
//文件讀取函式function PHP_Read($file_name) {$fd=fopen($file_name,r);while($bufline=fgets($fd, 4096)){$buf.=$bufline;}fclose($fd);return $buf;}?> 2、文件寫入函式
//文件寫入函式function PHP_Write($file_name,$data,$method=”w”) {$filenum=@fopen($file_name,$method);flock($filenum,LOCK_EX);$file_data=fwrite($filenum,$data);fclose($filenum);return $file_data;}?> 3、靜態頁面生成函式
//靜態頁面生成函式function phptohtm($filefrom,$fileto,$u2u=1){if($u2u==1){$data=PHP_Read($filefrom);}else{$data=$filefrom;}PHP_Write($fileto,$data);return true;}?> 4、指定條件信息數量檢索函式
//指定條件信息數量檢索函式function rec_exist($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 $num;}?> 5、目錄刪除函式
//目錄刪除函式function del_DIR($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 $directory ok “;}?> 6、目錄名稱合法性檢測函式
//目錄名稱合法性檢測function isen($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) || $p>122){nerror(“不符合規范!”);}$ret.=chr($p);}return $ret;}?> 7、PHP分頁函數
//分頁函數function splitlist($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(“該版內還沒有選擇發布新聞 !”);}$paper=1;}$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關于分頁函式的使用說明
8、PHP圖片文件上傳函式
//圖片文件上傳函式function upload_img($UploadFile,$UploadFile_name,$UploadFile_size,$UploadPath,$max_size=64){//$TimeLimit=60; //設置超時限制時間 缺省時間為 30秒 設置為0時為不限時//set_time_limit($TimeLimit);if(($UploadFile!= “none” )&&($UploadFile != “” )){$FileName=$UploadPath.$UploadFile_name;if($UploadFile_size <1024){$FileSize=”(string)$UploadFile_size” . “字節”;}elseif($UploadFile_size <(1024 * $max_size)){$FileSize=number_format((double)($UploadFile_size / 1024), 1) . ” KB”;}else{nerror(“文件超過限制大小!”);}//{//$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 $UploadFile_name 上載失敗!”);}unlink($UploadFile);}else{nerror(“文件 $UploadFile_name 已經存在!”);}//set_time_limit(30); //恢復缺省超時設置}} 以下是一些小技巧：
1、 PHP如何判斷ip地址合法性
if(!strcmp(long2ip(sprintf(“%u”,ip2long($ip))),$ip)) echo “is ipn”;—-email的正則判斷eregi(“^[_.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z_-]+.)+[a-zA-Z]$”, $email);檢測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) == $network) echo “valid ip and maskn”;?>—-
2、PHP文件下載頭部輸出如何設定
header(“Content-type: application/x-download”);header(“Content-Disposition: attachment; filename=$file_download_name;”);header(“Accept-Ranges: bytes”);header(“Content-Length: $download_size”);echo ‘xxx'
3、PHP用header輸出ftp下載方式,并且支持斷點續傳
一個例子:
header(‘Pragma: public');header(‘Cache-Control: private');header(‘Cache-Control: no-cache, must-revalidate');header(‘Accept-Ranges: bytes');header(‘Connection: close');header(“Content-Type: audio/mpeg”);header(“Location:ftp://download:1bk3l4s3k9s2@232.2.22.22/2222/web技術開發知識庫/cn_web.rmvb”);
4、PHP正則匹配中文
ereg(“^[".chr(0xa1)."-".chr(0xff)."]+$”, $str);
5、批量替換文本里面的超級鏈接
function urlParse($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;} 以上就是本文的全部內容，很常用的php技巧送給大家，希望大家喜歡。
