php-xdebug调试工具

有的时候发现PHP程序执行缓慢,但找不到原因。可以如xdebug来分析!

详细见:http://xdebug.org/

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PHP中去除数组中的空值的方法

PHP里面最重要的两章应该就是数组操作和字符串操作,这两章里面的函数都必须要熟练,其他的就等用的时候再查吧

方法1:以前在去掉数组的空值是都是强写foreach或者while的,利用这两个语法结构来删除数组中的空元素,简单代码如下

foreach( $arr as $k=>$v){   
    if( !$v )   
        unset( $arr[$k] );   
}  

只是这样效率不高,因为:foreach是将当前操作的数组进行copy,每操作一下foreach,都是copy了一个变量,页面里面如果有太多的foreach,会是一个很大的消耗

方法2:array_filter函数的功能是利用回调函数来对数组进行过滤,一直都以为用回调函数才能处理,却没有发现手册下面还有一句,如果没有回调函数,那么默认就是删除数组中值为false的项目


$entry = array(   
             0 => 'foo',   
             1 => false,   
             2 => -1,   
             3 => null,   
             4 => ''  
          );   
  
print_r(array_filter($entry)); 

方法3:array_diff函数的功能是计算数组的差集,它返回一个数组,该数组包括了所有在 array1 中但是不在任何其它参数数组中的值。注意键名保留不变

$array = array("a","b","",null,"c");
$array = array_diff($array, array(null));
print_r($array);

总结这么多,欢迎补充!

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php-mysql-sleep-benchmark注入引起的攻击

sleep函数

benchmark函数

存入注入的危害

mysql如果存在注入,并且注入的sleep语句如果传入一个足够大的参数,比如:sleep(9999999999).如果数据库用的是myisam引擎,且注入点是某个会锁表的语句(insert,replace,update,delete),那么整个数据表的访问都会被阻塞.如果数据库使用的是主从分离的架构,那么Master和Slave的同步会被sleep语句阻塞,导致从库无法从主库正常同步数据.一些依赖于主从同步的应用也会无法正常工作.就算仅仅是读操作,经过有限次的请求,也会很快的达到数据库的max_connections限制,而导致数据库拒绝服务.

修复方法

禁用mysql的sleep函数。或者修改它的sleep上限,拒绝不合理的超长sleep。现实中很少用到这个sleep功能,就算遇到需要sleep的场景,也可以通过外部应用来实现sleep. 配置 wait_timeout (建议value不要过小(10即可),不然可能会遇到“MySQL has gone away”之类的问题)

benchmark函数也是同样的原理.

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CentOS系统配置163的yum源

CentOS系统自带的更新源的速度实在是慢,为了让CentOS6使用速度更快的YUM更新源,可以选择163(网易)的更新源

1.下载repo文件

    wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

2.备份并替换系统的repo文件

    [root@localhost ~]# cd /etc/yum.repos.d/
    [root@localhost ~]# mv CentOS-Base.repo CentOS-Base.repo.bak
    [root@localhost ~]# mv CentOS6-Base-163.repo CentOS-Base.repo

3.执行yum源更新

    [root@localhost ~]# yum clean all
    [root@localhost ~]# yum makecache
    [root@localhost ~]# yum update

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js–parseInt(’08′)未指定进位制问题

今天在做JS关于月份的判断,对于parseInt(“01″)到parseInt(“07″);都能得到正确的结果,但如果是parseInt(“08″)或parseInt(“09″)则返回0

情况如下:

parseInt("01") //returns 1
parseInt("02") //returns 2
parseInt("03") //returns 3
parseInt("04") //returns 4
parseInt("05") //returns 5
parseInt("06") //returns 6
parseInt("07") //returns 7
parseInt("08") //returns 0?
parseInt("09") //returns 0?

首先看parseInt语法:parseInt(string, radix)
其中string为要转换的字符串,radix为二进制,八进制,十六进制或十进制
在默认不指定radix时,当以0x开关时,为十六进制.如果以0开关且第二位不为x,则让为是八进制,(因为八进制不能有8,9所以报错返回0).
所以,在我们用时还是明确指定进位制,以防出错。

如我们平时都用十进制位,我们就parseInt(“08″, 10).

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javascript简单的阻塞说明

这段代码后面的引用JS会阻塞前面行内JS代码

<?php

$type = @$_GET['type'];
if ( $type == 1 ){
	sleep(10);
	echo "alert(1);";
	exit;
}
echo time();
?>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script>
$(function(){
	alert(22);
})
</script>

<script type="text/javascript" src="http://test.xtgxiso.cn/test.php?type=1"></script>

简单修改成这样就不会了

<?php

$type = @$_GET['type'];
if ( $type == 1 ){
	sleep(10);
	echo "alert(1);";
	exit;
}
echo time();
?>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script>
$(function(){
	alert(22);
})
</script>

<script type="text/javascript">
    $(function(){
    var _bdhmProtocol = (("https:" == document.location.protocol) ? " https://" : " http://");
    document.write(unescape("%3Cscript src='" + _bdhmProtocol + "test.xtgxiso.cn/test.php?type=1' type='text/javascript'%3E%3C/script%3E"));
    })
</script> 

先简单说明一下,有时间再仔细分享.

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php下session_cache_limiter(private,must-revalidate)–表单填写内容不丢失

session_cache_limiter(private,must-revalidate)介绍
指定会话页面所使用的缓冲控制方法:
当session_cache_limiter(‘private’)时,用处是让表单history.go(-1)的时候,填写内容不丢失!就避免页面失效的警告!

这个会话与header(‘cache-control:private,must_revalidate’);效果相同

但是要值得注意的是session_cache_limiter()方法要写在session_start()方法之前才有用;

支持页面回跳详解,session_cache_limiter()的使用详解
现在表单的填写,我们可以用AJAX对用户随时进行验证,进行友好的提示,但是在用户没有留意AJAX友好提示,提交了错误的表单,跳回原页,而填写的信息却全部丢失了。要支持页面回跳,有以下的办法:

1.使用session_cache_limiter方法:

session_cache_limiter('private,must-revalidate'); 

但是要值得注意的是session_cache_limiter()方法要写在session_start()方法之前才有用;

2.用header来设置控制缓存的方法:

header('Cache-control: private, must-revalidate');//支持页面回跳

简单一些,就到这儿吧!

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GO—-操作session

在php内置了session功能,直接启用使用即可。

在GO语言中,标准包中并不支持session,现在推荐牛人开源的session包。

github.com/astaxie/session

使用代码如下:

package main

import (
	"fmt"
	"github.com/astaxie/session"
	_ "github.com/astaxie/session/providers/memory"
	"log"
	"net/http"
)

var globalSessions *session.Manager

//然后在init函数中初始化
func init() {
	globalSessions, _ = session.NewManager("memory", "gosessionid", 3600)
	go globalSessions.GC()
}

func sayhelloName(w http.ResponseWriter, r *http.Request) {
	sess := globalSessions.SessionStart(w, r)
	w.Header().Set("Content-Type", "text/html")
	sessionval := sess.Get("username")
	if sessionval == nil {
		fmt.Fprintf(w, "session:username  is null<br/>")
		sess.Set("username", "sessionval")
	} else {
		fmt.Fprintf(w, "session:username  is ")
		fmt.Fprintf(w, sessionval.(string))
		fmt.Fprintf(w, "<br/>")
	}
}

func main() {
	http.HandleFunc("/", sayhelloName)       //设置访问的路由
	err := http.ListenAndServe(":9090", nil) //设置监听的端口
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

大家可以参考代码来了解session的原理!

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php-字符串带有全角逗号引起的变量不解析

一般情况下:

$str = "hello";
$msg = "你好,$str,world";

var_dump($msg);

一般会输出:

string(16) "你好,hello,world"

如果是这样:

$str = "hello";
$msg = "你好,$str,world";

var_dump($msg);

竟然是这样:

Notice: Undefined variable: str,world in E:\source\test\test.php on line 5
string(5) "你好," 

奇怪吧?,这么改一下就好了!

$str = "hello";
$msg = "你好,{$str},world";

var_dump($msg);

具体原因不明呀!

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使用GDB调试GO程序

GDB是FSF(自由软件基金会)发布的一个强大的类UNIX系统下的程序调试工具。使用GDB可以做如下事情:

  1. 启动程序,可以按照开发者的自定义要求运行程序。
  2. 可让被调试的程序在开发者设定的调置的断点处停住。(断点可以是条件表达式)
  3. 当程序被停住时,可以检查此时程序中所发生的事。
  4. 动态的改变当前程序的执行环境。

目前支持调试Go程序的GDB版本必须大于7.1

务必保证执行如下操作(保证info goroutines可用)
vim ~/.gdbinit 添加下面一行:
add-auto-load-safe-path $GOROOT/src/pkg/runtime/runtime-gdb.py
把$GOROOT替换为你自己的路径

常用命令
list
简写命令l,用来显示源代码,默认显示十行代码,后面可以带上参数显示的具体行,例如:list 15,显示十行代码,其中第15行在显示的十行里面的中间
break
简写命令b,用来设置断点,后面跟上参数设置断点的行数,例如b 10在第十行设置断点
delete
简写命令d,用来删除断点,后面跟上断点设置的序号,这个序号可以通过info breakpoints获取相应的设置的断点序号,如下是显示的设置断点序号
backtrace
简写命令bt,用来打印执行的代码过程
info
info命令用来显示信息,后面有几种参数,我们常用的有如下几种
    info locals
    显示当前执行的程序中的变量值
    info breakpoints
    显示当前设置的断点列表
    info goroutines
    显示当前执行的goroutine列表,带*的表示当前执行的
print
简写命令p,用来打印变量或者其他信息,后面跟上需要打印的变量名,当然还有一些很有用的函数$len()和$cap(),用来返回当前string,slices或者maps的长度和容量
whatis
用来显示当前变量的类型,后面跟上变量名
next
简写命令n,用来单步调试.跳到下一步.当有断点之后.可以输入n跳转到下一步继续执行
coutinue
简称命令c,用来跳出当前断点处,后面可以跟参数N,跳过多少次断点
set variable
该命令用来改变运行过程中的变量值,格式如:set variable <var>=<value>

调试过程

我们通过下面这个代码来演示如何通过GDB来调试Go程序,下面是将要演示的代码:

package main

import (
    "fmt"
    "time"
)

func counting(c chan<- int) {
    for i := 1; i <= 10; i++ {
        time.Sleep(1 * time.Second)
        c <- i
    }
    close(c)
}

func main() {
    fmt.Println("main start")
    isexit := 0
    c := make(chan int)
    go counting(c)
    for count := range c {
        if isexit > 0 {
          break
        }
        fmt.Println("c:", count)
    }
    fmt.Println("main end")
}                                                                                                                                                                                                                         

编译文件,生成可执行文件gdb:

go build gdb.go

通过gdb命令启动调试

gdb gdb

启动之后首先看看这个程序是不是可以运行起来,只要输入run命令回车后程序就开始运行,程序正常的话可以看到程序输出如下,和我们在命令行直接执行程序输出是一样的:

(gdb) run
Starting program: /home/xtgxiso/src/gdb/gdb 
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000
main start
c: 1
c: 2
c: 3
c: 4
c: 5
c: 6
c: 7
c: 8
c: 9
c: 10
main end
[LWP 18714 exited]
[Inferior 1 (process 18714) exited normally]

好了,现在我们已经知道怎么让程序跑起来了,接下来开始给代码设置断点:

(gdb) b 25
Breakpoint 1 at 0x400dae: file /home/xtgxiso/src/gdb/gdb.go, line 25.

上面例子b 25表示在第25行设置了断点,之后输入run开始运行程序,现在程序在前面设置断点的地方停住了,我们需要查看断点相应上下文的源码,输入list就可以看到源码显示从当前停止行的前五行开始:

(gdb) run
Starting program: /home/xtgxiso/src/gdb/gdb 
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000
main start
[New LWP 19761]
[Switching to LWP 19761]

Breakpoint 1, main.main () at /home/xtgxiso/src/gdb/gdb.go:25
25                     fmt.Println("c:", count)
(gdb) list
20              go counting(c)
21              for count := range c {
22                      if isexit > 0 {
23                        break
24                      }
25                      fmt.Println("c:", count)
26              }
27              fmt.Println("main end")
28      }

现在GDB在运行当前的程序的环境中已经保留了一些有用的调试信息,我们只需打印出相应的变量,查看相应变量的类型及值:

(gdb) info locals
isexit = 0
count = 1
c = 0xc210039060
(gdb) p count
$1 = 1
(gdb) p c
$2 = (chan int) 0xc210039060
(gdb) whatis c
type = chan int

接下来该让程序继续往下执行,请继续看下面的命令

(gdb) c
Continuing.
c: 1

Breakpoint 1, main.main () at /home/xtgxiso/src/gdb/gdb.go:25
25                      fmt.Println("c:", count)
(gdb) c
Continuing.
c: 2

Breakpoint 1, main.main () at /home/xtgxiso/src/gdb/gdb.go:25
25                      fmt.Println("c:", count)

每次输入c之后都会执行一次代码,又跳到下一次for循环,继续打印出来相应的信息,设想目前需要改变上下文相关变量的信息,跳过一些过程,得出修改后想要的结果:

(gdb) info locals
isexit = 0
count = 2
c = 0xf840001a50
(gdb) set variable isexit=1
(gdb) info locals
isexit = 1
count = 3
c = 0xf840001a50
(gdb) c
Continuing.
c: 3
main end
[LWP 11588 exited]
[Inferior 1 (process 11588) exited normally]

最后稍微思考一下,前面整个程序运行的过程中到底创建了多少个goroutine,每个goroutine都在做什么:

(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/xtgxiso/src/gdb/gdb 
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000
main start

Breakpoint 2, main.main () at /home/xtgxiso/src/gdb/gdb.go:25
25                      fmt.Println("c:", count)
(gdb) info goroutines 
* 1  running runtime.park
* 2  syscall runtime.notetsleepg
  3  waiting runtime.park
  4 runnable runtime.park
(gdb) goroutine 3 bt
#0  0x0000000000415586 in runtime.park (unlockf=void, lock=void, reason=void) at /usr/local/go/src/pkg/runtime/proc.c:1342
#1  0x0000000000420084 in runtime.tsleep (ns=void, reason=void) at /usr/local/go/src/pkg/runtime/time.goc:79
#2  0x000000000041ffb1 in time.Sleep (ns=void) at /usr/local/go/src/pkg/runtime/time.goc:31
#3  0x0000000000400c38 in main.counting (c=0xc210039060) at /home/xtgxiso/src/gdb/gdb.go:10
#4  0x0000000000415750 in ?? () at /usr/local/go/src/pkg/runtime/proc.c:1385
#5  0x000000c210039060 in ?? ()
#6  0x0000000000000000 in ?? ()

通过查看goroutines的命令我们可以清楚地了解goruntine内部是怎么执行的,每个函数的调用顺序已经明明白白地显示出来了.

本文简单介绍了GDB调试Go程序的一些基本命令,通过上面的例子演示,如果你想获取更多的调试技巧请参考官方网站的GDB调试手册,还有GDB官方网站的手册

http://www.gnu.org/software/gdb/

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