php与浏览器缓存机制介绍

<?php
   include('./phpqrcode/phpqrcode.php');
   // 二维码数据
   $data = 'http://gz.altmi.com';
   // 生成的文件名
   $filename = $errorCorrectionLevel.'|'.$matrixPointSize.'.png';
   // 纠错级别：L、M、Q、H
   $errorCorrectionLevel = 'L'; 
   // 点的大小：1到10
   $matrixPointSize = 4; 
   QRcode::png($data, $filename, $errorCorrectionLevel, $matrixPointSize, 2);

?>
 
# 创建一个二维码文件
QRcode::png('code data text', 'filename.png');
// creates file
 
# 生成图片到浏览器
QRcode::png('some othertext 1234');
// creates code image and outputs it directly into browser

$urlToEncode="http://gz.altmi.com";
generateQRfromGoogle($urlToEncode);
function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0')
{
    $url = urlencode($url); 
    echo '<img src="http://chart.apis.google.com/chart?chs='.$widhtHeight.'x'.$widhtHeight.'&cht=qr&chld='.$EC_level.'|'.$margin.'&chl='.$chl.'" alt="QR code" widhtHeight="'.$size.'" widhtHeight="'.$size.'"/>';
}

#!/bin/sh
 
#check MySQL_Slave Status
#crontab time 00:10
MYSQL_USER="root"
MYSQL_PWD="123456"
MYSQL_SLAVE_LOG="/tmp/check_mysql_slave.log"
EMAIL="1351010****@139.com"
 
MYSQL_PORT=`netstat -na|grep "LISTEN"|grep "3306"|awk -F[:" "]+ '{print $5}'`
MYSQL_IP=`ifconfig eth0|grep "inet addr" | awk -F[:" "]+ '{print $4}'`
MYSQL_SLAVE_STATUS=$(/usr/local/webserver/mysql/bin/mysql -u root -psylc23hua -S /tmp/mysql.sock -e

"show slave statusG" | grep -i "running")
IO_ENV=`echo $MYSQL_SLAVE_STATUS | grep IO | awk ' {print $2}'`
SQL_ENV=`echo $MYSQL_SLAVE_STATUS | grep SQL | awk '{print $2}'`
NOW=$(date -d today +'%Y-%m-%d %H:%M:%S')
 
if [ "$MYSQL_PORT" = "3306" ];then
  echo "mysql is running!"
else
  mail -s "warn!server: $MYSQL_IP mysql is down" "$EMAIL"
fi
 
if [ "$IO_ENV" = "Yes" -a "$SQL_ENV" = "Yes" ];then
  echo "Slave is running!"
else
  echo "[ $NOW ] Slave is not running!" >> "$MYSQL_SLAVE_LOG"
  cat "$MYSQL_SLAVE_LOG" | mail -s "WARN! ${MySQL_IP}_replicate_error" "$EMAIL"
fi
 
exit 0

check_rep.php

<!--?php<br /-->if(empty($_REQUEST["key"])) die(':) missing key');
if($_REQUEST["key"] != 'xupeng') die(':) error key');

include("mysql_instance.php");
include("check_status_api.php");

define("USERNAME", "用户名");
define("PASSWORD", "密码");
define("DEBUGMODE", false);

$instances = get_instances();

if($instances){
 echo <<

<!-- 30分钟自动刷新 -->

END;
 echo "
n";
 if(!DEBUGMODE){
  echo "

n";
 }else{
  echo "

n";
 }
 foreach($instances as $host){
  $res = check_mysql_replication_status($host, USERNAME, PASSWORD);
  if(!DEBUGMODE){
   switch($res["result"]){
    case -4:
     $memo = "未知异常";
     break;
    case -3:
     $memo = "查询失败";
     break;
    case -2:
     $memo = "无法连接端口";
     break;
    case -1:
     $memo = "状态未知";
     break;
    case 0:
     $memo = "OK";
     break;
    case 1:
     $memo = "同步失败";
     if($res["Slave_IO_Running"] <> "Yes"){
      $memo .= $res["Last_IO_Error"] . "(" .  $res

["Last_IO_Errno"] . ")";
     }
     if($res["Slave_SQL_Running"] <> "Yes"){
      $memo .= $res["Last_SQL_Error"] . "(" .  $res

["Last_SQL_Errno"] . ")";
     }
     break;
    case 2:
     $memo = "数据库未设置同步";
     break;
   }
   echo "

n";
  }else{
   echo "

n";
  }
 }
 echo "
<table border="">
<tbody>
<tr>
<td>instance</td>
<td>result</td>
<td>Slave_IO_Running</td>
<td>Slave_SQL_Running</td>
<td>Master_Host</td>
<td>Master_Port</td>
<td>Replicate_Do_DB</td>
<td>memo</td>
</tr>
<tr>
<td>instance</td>
<td>result</td>
<td>Slave_IO_Running</td>
<td>Slave_SQL_Running</td>
<td>Master_Host</td>
<td>Master_Port</td>
<td>Replicate_Do_DB</td>
<td>Slave_IO_State</td>
<td>Last_IO_Errno</td>
<td>Last_IO_Error</td>
<td>Last_SQL_Errno</td>
<td>Last_SQL_Error</td>
</tr>
<tr>
<td>{$host}</td>
<td>{$res['result']}</td>
<td>{$res['Slave_IO_Running']}</td>
<td>{$res['Slave_SQL_Running']}</td>
<td>{$res['Master_Host']}</td>
<td>{$res['Master_Port']}</td>
<td>{$res['Replicate_Do_DB']}</td>
<td>{$memo}</td>
</tr>
<tr>
<td>{$host}</td>
<td>{$res['result']}</td>
<td>{$res['Slave_IO_Running']}</td>
<td>{$res['Slave_SQL_Running']}</td>
<td>{$res['Master_Host']}</td>
<td>{$res['Master_Port']}</td>
<td>{$res['Replicate_Do_DB']}</td>
<td>{$res['Slave_IO_State']}</td>
<td>{$res['Last_IO_Errno']}</td>
<td>{$res['Last_IO_Error']}</td>
<td>{$res['Last_SQL_Errno']}</td>
<td>{$res['Last_SQL_Error']}</td>
</tr>
</tbody>
</table>
n";
 echo <<

END;
}else{
 die("no mysql instances defined.");
}
check_status_api.php

<!--?php<br /-->/*
 * 检查mysql服务器的同步状态
 */
function check_mysql_replication_status($host, $username, $password)
{
 //默认状态未知
 $r = array(
  "result" => -1
  );
 try{
  $dbh = @mysql_connect($host, $username, $password);
  if(!$dbh){
   //无法连接
   $r["result"] = -2;
   return($r);
  }
  $query = "SHOW SLAVE STATUS";
  $res = @mysql_query($query, $dbh);
  $err = @mysql_error();
  if($err){
   //无法连接
   $r["result"] = -3;
   return($r);
  }
  $row = mysql_fetch_array($res);
  $r = $row;
  if(($r["Slave_IO_Running"] == "Yes") && ($r["Slave_SQL_Running"] == "Yes"))
  {
   $r["result"] = 0;
  }else{
   if(!empty($row)){
    $r["result"] = 1;
   }else{
    $r["result"] = 2;
   }
  }
 }catch(Exception $e){
  $r["result"] = -4;
 }
 return($r);
}
mysql_instance.php

<!--?php 
//GRANT REPLICATION CLIENT ON *.* TO '用户名'@'监控主机ip' IDENTIFIED BY '密码';  $mysql_instances =

array();
$mysql_instances[] = "远程ip:端口";  $mysql_instances[] = "远程ip:端口";
function get_instances()
{   
global $mysql_instances;   
return $mysql_instances; 
} 
?-->

<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
var_dump($fruits);
?>
结果
array
'a' => string 'orange' (length=6)
'd' => string 'lemon' (length=5)
'b' => string 'banana' (length=6)
'c' => string 'apple' (length=5)

--------------------ksort按照数组的key升序排列-------------- <?php$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
var_dump($fruits);
?>
结果
array
'a' => string 'orange' (length=6)
'b' => string 'banana' (length=6)
'c' => string 'apple' (length=5)
'd' => string 'lemon' (length=5)

<?php
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
krsort($fruits);
var_dump($fruits);
?>

array
'd' => string 'lemon' (length=5)
'c' => string 'apple' (length=5)
'b' => string 'banana' (length=6)
'a' => string 'orange' (length=6)

<?php
function cmp($a, $b)
{
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}

$a = array(3, 2, 5, 6, 1);

usort($a, "cmp");

var_dump($a);
?>
结果：
array
0 => int 1
1 => int 2
2 => int 3
3 => int 5
4 => int 6

<?php
function cmp($a, $b)
{
$a = preg_replace('@^(a|an|the) @', '', $a);
$b = preg_replace('@^(a|an|the) @', '', $b);
return strcasecmp($a, $b);
}

$a = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);

uksort($a, "cmp");

var_dump($a);
?>
结果：
array
'an apple' => int 3
'a banana' => int 4
'the Earth' => int 2
'John' => int 1

<?php
// Comparison function
function cmp($a, $b) {
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}

// Array to be sorted
$array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
var_dump($array);

// Sort and print the resulting array
uasort($array, 'cmp');
var_dump($array);
?>
结果：
array
'a' => int 4
'b' => int 8
'c' => int -1
'd' => int -9
'e' => int 2
'f' => int 5
'g' => int 3
'h' => int -4
array
'd' => int -9
'h' => int -4
'c' => int -1
'e' => int 2
'g' => int 3
'a' => int 4
'f' => int 5
'b' => int 8

<?php
$ar = array(
array("10", 11, 100, 100, "a"),
array( 1, 2, "2", 3, 1)
);

array_multisort($ar[0], SORT_ASC, SORT_STRING,
$ar[1], SORT_NUMERIC, SORT_DESC);
var_dump($ar);
?>
结果：
array
0 =>
array
0 => string '10' (length=2)
1 => int 100
2 => int 100
3 => int 11
4 => string 'a' (length=1)
1 =>
array
0 => int 1