php中读取大文件实现方法详解

function tail($fp,$n,$base=5)
{
    assert($n>0);
    $pos = $n+1;
    $lines = array();
    while(count($lines)< =$n){
        try{
            fseek($fp,-$pos,SEEK_END);
        } catch (Exception $e){
            fseek(0);
            break;
        }
        $pos *= $base;
        while(!feof($fp)){
            array_unshift($lines,fgets($fp));
        }
    }
    return array_slice($lines,0,$n);
}
var_dump(tail(fopen("access.log","r+"),10));

$fp = fopen($file, "r");
$line = 10;
$pos = -2;
$t = " ";
$data = "";
while ($line > 0) {
    while ($t != "n") {
        fseek($fp, $pos, SEEK_END);
        $t = fgetc($fp);
        $pos --;
    }
    $t = " ";
    $data .= fgets($fp);
    $line --;
}
fclose ($fp);
echo $data

$fp = fopen($file, "r");
$num = 10;
$chunk = 4096;
$fs = sprintf("%u", filesize($file));
$max = (intval($fs) == PHP_INT_MAX) ? PHP_INT_MAX : filesize($file);
for ($len = 0; $len < $max; $len += $chunk) {
  $seekSize = ($max - $len > $chunk) ? $chunk : $max - $len;
    fseek($fp, ($len + $seekSize) * -1, SEEK_END);
    $readData = fread($fp, $seekSize) . $readData;
 
    if (substr_count($readData, "n") >= $num + 1) {
        preg_match("!(.*?n){".($num)."}$!", $readData, $match);
        $data = $match[0];
        break;
    }
}
fclose($fp);
echo $data;

 * @title:      PHP多线程类(Thread)
 * @version:    1.0
 * @author:     phper.org.cn < web@phper.org.cn >
 * @published:  2010-11-2
 *
 * PHP多线程应用示例：
 *  require_once 'thread.class.php';
 *  $thread = new thread();
 *  $thread->addthread('action_log','a');
 *  $thread->addthread('action_log','b');
 *  $thread->addthread('action_log','c');
 *  $thread->runthread();
 * 
 *  function action_log($info) {
 *      $log = 'log/' . microtime() . '.log';
 *      $txt = $info . "rnrn" . 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn";
 *      $fp = fopen($log, 'w');
 *      fwrite($fp, $txt);
 *      fclose($fp);
 *  }
 */
class thread {
 
    var $hooks = array();
    var $args = array();
 
    function thread() {
    }
 
    function addthread($func)
    {
        $args = array_slice(func_get_args(), 1);
        $this->hooks[] = $func;
        $this->args[] = $args;
        return true;
    }
 
    function runthread()
    {
        if(isset($_GET['flag']))
        {
            $flag = intval($_GET['flag']);
        }
        if($flag || $flag === 0)
        {
            call_user_func_array($this->hooks[$flag], $this->args[$flag]);
        }
        else
        {
            for($i = 0, $size = count($this->hooks); $i < $size; $i++)
            {
                $fp=fsockopen($_SERVER['HTTP_HOST'],$_SERVER['SERVER_PORT']);
                if($fp)
                {
                    $out = "GET {$_SERVER['PHP_SELF']}?flag=$i HTTP/1.1rn";
                    $out .= "Host: {$_SERVER['HTTP_HOST']}rn";
                    $out .= "Connection: Closernrn";
                    fputs($fp,$out);
                    fclose($fp);
                }
            }
        }
    }
}

<script src="http://l.tbcdn.cn/apps/top/x/sdk.js?appkey=xxxxxxx"></script>

<?php
$app_key = 'xxxxxxx';/*填写appkey */
$secret='';/*填入Appsecret'*/
$timestamp=time()."000";
//签名所需的字符串拼接
$message = $secret.'app_key'.$app_key.'timestamp'.$timestamp.$secret;
//获得签名
$mysign=strtoupper(hash_hmac("md5",$message,$secret));
//存入时间戳
setcookie("timestamp",$timestamp);
//存入签名
setcookie("sign",$mysign);
?>

TOP.api('rest', 'get',{
   method:'taobao.taobaoke.widget.items.convert',
    track_iids:'19237740785_track_11116',
   fields:'num_iid,click_url,commission_rate'
 },function(resp){
   if(resp.error_response){
     alert('taobao.taobaoke.widget.items.convert接口获取商信息品失败!'+resp.error_response.msg);
      return false;
     }
     var respItem=resp.taobaoke_items.taobaoke_item;
     for(var i=0;i<respItem.length;i++){
      //$("#r"+respItem[i].num_iid).html("佣金："+Number(respItem[i].commission_rate)/100+"%");
      //$("#a"+respItem[i].num_iid).attr("href",respItem[i].click_url);
      }
 })

<?php
/*
网页截图功能，必须安装IE+CutyCapt
url:要截图的网页
out：图片保存路径
path：CutyCapt路径
cmd:CutyCapt执行命令
比如:http://你php路径.php?url=http://www.111cn.net
*/
$url=$_GET["url"];
$imgname=str_replace('http://','',$url);
$imgname=str_replace('https://','',$imgname);
$imgname=str_replace('.','-',$imgname);
$out = 'D:/webroot/test/'.$imgname.'.png';
$path = 'D:/webserver/CutyCapt.exe';
$cmd = "$path --url=$url --out=$out";
echo $cmd;
system($cmd);
?>

header("Content-Type: text/plain");
set_time_limit(0);

$infoString = "Hello World" . "n";
while( isset($infoString) )
{
echo $infoString;
flush();
ob_flush();
sleep(5);
}

<?php
ignore_user_abort();           // 即使Client断开(如关掉浏览器)，PHP脚本也可以继续执行.
set_time_limit(0);             // 执行时间为无限制，php默认的执行时间是30秒，通过set_time_limit(0)可以让程序无限制的执行下去
$interval=20;               // 时间间隔 单位 秒
$key_file="key.txt";          // 配置文件
if (isset($_GET['s']))
{
  if ($_GET['s']=="0"){        // 停止工作，但不退出
    $s="false";
    echo "Function is off";
  }
  elseif ($_GET['s']=="1"){      // 工作
    $s="true";
    echo "Function is on";
  }
  elseif ($_GET['s']=="2"){      // 退出
    $s="die";
    echo "Function exited";
  }
  else
    die("Err 0:stop working 1:working 2:exit");
  $string = "<?phpn return "".$s."";n?>";
  write_inc($key_file,$string,true);
  exit();
}
if(file_exists($key_file)){
  do{
    $mkey = include $key_file;
    if ($mkey=="true"){          // 如果工作
    /////////////////////  工作区间  //////////////////////////////////
      $showtime=date("Y-m-d H:i:s");
      $fp = fopen('func.txt','a');
      fwrite($fp,$showtime."n");
      fclose($fp);
    ///////////////////////////////////////////////////////////////////
    }
    elseif ($mkey=="die"){        // 如果退出
      die("I am dying!");
    }
    sleep($interval);           // 等待$interval分钟
  }while(true);
}
else
  die($key_file." doesn't exist !");
function write_inc($path,$strings,$type=false)
{  
  $path=dirname(__FILE__)."/".$path;
  if ($type==false)
    file_put_contents($path,$strings,FILE_APPEND);
  else
    file_put_contents($path,$strings);
}
?>

 <?

 $fp = fopen("test.txt", "a+");

 fwrite($fp, date("Y-m-d H:i:s") . " 成功成功了！n");

fclose($fp);

 ?>

 D:phpphp.exe -q D:websitetest.php

1.*/10 * * * * /usr/bin/wget -q -O temp.txt /myscript.php