Home >php教程 >php手册 >PHP常用技巧总结(附函数代码)

PHP常用技巧总结(附函数代码)

WBOY
WBOYOriginal
2016-06-06 20:39:57809browse

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

PHP分页函数
代码如下:
//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(($LRLIST*2+1) if(($paper-$LRLIST) $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=$tract;$iif ($i!=$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
代码如下:
/*
#### 检索分页函式 ####
Int $HALT – 检索结果仅分1页时是否(1/0)显示页码条
Int $LRLIST – (页码条显示页码数-1)/2
Int $ECHOCNT – 检索时每页显示记录的数量
Int $paper – 页数,预提取:$paper=$HTTP_GET_VARS[paper];
Varchar $table – 数据表名,预附值:$table=”db.table”;
Varchar $where – 检索条件,预附值:$where=”where field='value'”;
Varchar $enwhere – 将原$where进行两次base64_encode()编码后以GET的方式提交
Varchar $splitstr – 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 $where) – 分页后检索语句的检索条件
注意:本函式需调用出错处理函式 nerror($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 $FileSize=”(string)$UploadFile_size” . “字节”;
}elseif($UploadFile_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;
}

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn