PHP常用技巧总结（附函数代码）_php技巧

PHP文件读取函式

 <BR>//文件读取函式 <BR>function PHP_Read($file_name) { <BR>$fd=fopen($file_name,r); <BR>while($bufline=fgets($fd, 4096)){ <BR>$buf.=$bufline; <BR>} <BR>fclose($fd); <BR>return $buf; <BR>} <BR>?> <BR>

文件写入函式

 <BR>//文件写入函式 <BR>function PHP_Write($file_name,$data,$method=”w”) { <BR>$filenum=@fopen($file_name,$method); <BR>flock($filenum,LOCK_EX); <BR>$file_data=fwrite($filenum,$data); <BR>fclose($filenum); <BR>return $file_data; <BR>} <BR>?> <BR>

静态页面生成函式

 <BR>//静态页面生成函式 <BR>function phptohtm($filefrom,$fileto,$u2u=1){ <BR>if($u2u==1){ <BR>$data=PHP_Read($filefrom); <BR>}else{ <BR>$data=$filefrom; <BR>} <BR>PHP_Write($fileto,$data); <BR>return true; <BR>} <BR>?> <BR>

指定条件信息数量检索函式

 <BR>//指定条件信息数量检索函式 <BR>function rec_exist($table,$where){ <BR>$query=”select count(*) as num from $table “.$where; <BR>$result=mysql_query($query) or die(nerror(1)); <BR>$rowcount=mysql_fetch_array($result); <BR>$num=$rowcount["num"]; <BR>if ($num==0){ <BR>return false; <BR>} <BR>return $num; <BR>} <BR>?> <BR>

目录删除函式

 <BR>//目录删除函式 <BR>function del_DIR($directory){ <BR>$mydir=dir($directory); <BR>while($file=$mydir->read()){ <BR>if((is_dir(“$directory/$file”)) AND ($file!=”.”) AND ($file!=”..”)){ <BR>del_DIR(“$directory/$file”); <BR>}else{ <BR>if(($file!=”.”) AND ($file!=”..”)){ <BR>unlink(“$directory/$file”); <BR>//echo “unlink $directory/$file ok “; <BR>} <BR>} <BR>} <BR>$mydir->close(); <BR>rmdir($directory); <BR>//echo “rmdir $directory ok “; <BR>} <BR>?> <BR>

目录名称合法性检测函式

 <BR>//目录名称合法性检测 <BR>function isen($str){ <BR>$ret=”"; <BR>for($i=0;$i $p=ord(substr($str,$i,1)); <BR>if(($p57 & $p90 & $p122){ <BR>nerror(“不符合规范!”); <BR>} <BR>$ret.=chr($p); <BR>} <BR>return $ret; <BR>} <BR>?> <BR>

PHP分页函数

 <BR>//分页函数 <BR>function splitlist($HALT,$LRLIST,$ECHOCNT,$paper,$table,$where,$page_id,$userid){ <BR>global $splitstr,$sumcnt; <BR>if($paper==”" || $sumcnt==”"){ <BR>$query = “select count(*) as num from $table $where”; <BR>$result = mysql_query($query); <BR>$row = mysql_fetch_array($result); <BR>$sumcnt=$row["num"]; <BR>if($sumcnt==0){ <BR>nerror(“该版内还没有选择发布新闻 !”); <BR>} <BR>$paper=1; <BR>} <BR>$sumpaper=($sumcnt-$sumcnt%$ECHOCNT)/$ECHOCNT; <BR>if(($sumcnt%$ECHOCNT)!=0) $sumpaper+=1; <BR>if($sumpaper==1 && $HALT==0) return($where); <BR>$enwhere=base64_encode(base64_encode($where)); <BR>if(($LRLIST*2+1) < $sumpaper){ <BR>if(($paper-$LRLIST) < 2){ <BR>$tract=1; <BR>$sub=$LRLIST*2+1; <BR>}else if(($paper+$LRLIST) >= $sumpaper){ <BR>$tract=$sumpaper-($LRLIST*2); <BR>$sub=$sumpaper; <BR>}else{ <BR>$tract=$paper-$LRLIST; <BR>$sub=$paper+$LRLIST; <BR>} <BR>}else{ <BR>$tract=1; <BR>$sub=$sumpaper; <BR>} <BR>$uppaper=$paper-1; <BR>$downpaper=$paper+1; <BR>$startcnt=($paper-1)*$ECHOCNT; <BR>$where.=” limit ${ startcnt },${ ECHOCNT }”; <BR>if($tract > 1) { $splitstr=”【 << “; } <BR>else $splitstr=”【 << “; <BR>for($i=$tract;$i<=$sub;$i++){ <BR>if ($i!=$paper) $splitstr.=”".$i.” “; <BR>else $splitstr.=”".$i.” “; <BR>} <BR>if ($sub!=$sumpaper) $splitstr.=”>> 】”; <BR>else $splitstr.=”>> 】”; <BR>return($where); <BR>} <BR>?> <BR>

PHP关于分页函式的使用说明

 <BR>/* <BR>#### 检索分页函式 #### <BR>Int $HALT – 检索结果仅分1页时是否(1/0)显示页码条 <BR>Int $LRLIST – (页码条显示页码数-1)/2 <BR>Int $ECHOCNT – 检索时每页显示记录的数量 <BR>Int $paper – 页数，预提取：$paper=$HTTP_GET_VARS[paper]; <BR>Varchar $table – 数据表名,预附值：$table=”db.table”; <BR>Varchar $where – 检索条件，预附值：$where=”where field='value'”; <BR>Varchar $enwhere – 将原$where进行两次base64_encode()编码后以GET的方式提交 <BR>Varchar $splitstr – 页码条输出字串，执行函式后在相应的位置执行 echo $splitstr; <BR>函式调用前需获取变量 - <BR>$paper=$HTTP_GET_VARS[paper]; <BR>$sumcnt=$HTTP_GET_VARS[sumcnt]; <BR>$enwhere=$HTTP_GET_VARS[enwhere]; <BR>Return (Varchar $where) – 分页后检索语句的检索条件 <BR>注意：本函式需调用出错处理函式 nerror($error); <BR>*/ <BR>PHP图片文件上传函式 <BR>//图片文件上传函式 <BR>function upload_img($UploadFile,$UploadFile_name,$UploadFile_size,$UploadPath,$max_size=64){ <BR>//$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 <BR>//set_time_limit($TimeLimit); <BR>if(($UploadFile!= “none” )&&($UploadFile != “” )){ <BR>$FileName=$UploadPath.$UploadFile_name; <BR>if($UploadFile_size <1024){ <BR>$FileSize=”(string)$UploadFile_size” . “字节”; <BR>}elseif($UploadFile_size <(1024 * $max_size)){ <BR>$FileSize=number_format((double)($UploadFile_size / 1024), 1) . ” KB”; <BR>}else{ <BR>nerror(“文件超过限制大小!”); <BR>} <BR>//{ <BR>//$FileSize=”number_format((double)($UploadFile_size” / (1024 * 1024)), 1) . ” MB”; <BR>// } <BR>if(!file_exists($FileName)){ <BR>if(copy($UploadFile,$FileName)){ <BR>return “$UploadFile_name ($FileSize)”; <BR>}else{ <BR>nerror(“文件 $UploadFile_name 上载失败!”); <BR>} <BR>unlink($UploadFile); <BR>}else{ <BR>nerror(“文件 $UploadFile_name 已经存在!”); <BR>} <BR>//set_time_limit(30); //恢复缺省超时设置 <BR>} <BR>} <BR>

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: $downlo本文来源gao@daima#com搞(%代@#码@网&搞gaodaima代码ad_size”);
echo ‘xxx’
PHP用header输出ftp下载方式,并且支持断点续传
一个例子:
header(‘Pragma: public’);
header(‘Cache-Control: private’);
header(‘Cache-Control: no-cache, must-revalidate’);
header(‘Accept-Ranges: bytes’);
header(‘Connection: close’);
header(“Content-Type: audio/mpeg”);
header(“Location:ftp://download:[email protected]/2222/web技术开发知识库/cn_web.rmvb”);
PHP正则匹配中文
ereg(“^[“.chr(0xa1).”-“.chr(0xff).”]+$”, $str);
批量替换文本里面的超级链接
function urlParse($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;
}

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