[转] password strength

password strength

http://phpsnips.com/552/Password-Strength#.UfXXRGTN_3Q

/**
 *
 * @param String $string
 * @return float
 *
 * Returns a float between 0 and 100. The closer the number is to 100 the
 * the stronger password is; further from 100 the weaker the password is.
 */ function password_strength($string){
    $h    = 0;
    $size = strlen($string);
    foreach(count_chars($string, 1) as $v){
        $p = $v / $size;
        $h -= $p * log($p) / log(2);
    }
    $strength = ($h / 4) * 100;
    if($strength > 100){
        $strength = 100;
    }
    return $strength;
}var_dump(password_strength("Correct Horse Battery Staple"));
echo "
"; var_dump(password_strength("Super Monkey Ball"));
echo "
"; var_dump(password_strength("Tr0ub4dor&3"));
echo "
"; var_dump(password_strength("abc123"));
echo "
"; var_dump(password_strength("sweet"));

[总结] Library not loaded: /opt/local/lib/libiconv.2.dylib 错误解决之法

1. 背景
工作中需要用到 php 的一个图形库的扩展模块 gmagick.
而目前使用的 php 在编译时并没有将 gmagick 静态编译进去,于是通过编译扩展模块来实现.
扩展模块的编译很顺利,但挂在 php 上后发现没有生效.写的简单的脚本测试发现 php error.log 中报如下的错

PHP Warning:  PHP Startup: Unable to load dynamic library '/Users/hy0kl/php/ext/gmagick.so' - dlopen(/Users/hy0kl/php/ext/gmagick.so, 9): Library not loaded: /opt/local/lib/libiconv.2.dylib
  Referenced from: /Users/hy0kl/php/ext/gmagick.so
  Reason: Incompatible library version: gmagick.so requires version 8.0.0 or later, but libiconv.2.dylib provides version 7.0.0 in Unknown on line 0

谷歌后发现,我的机器中有两个版的 libiconv:
$ otool -LD /usr/lib/libiconv.2.dylib
/usr/lib/libiconv.2.dylib:
/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.0.0)

$ otool -LD /opt/local/lib/libiconv.2.dylib
/opt/local/lib/libiconv.2.dylib:
/opt/local/lib/libiconv.2.dylib (compatibility version 8.0.0, current version 8.1.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)
初步确认是动态的加载顺序没有搞对.
多次尝试 + 不断的 google,终于发现了下面的有用帮助:
https://code.google.com/p/git-osx-installer/issues/detail?id=18

Found out that it wasn't a problem running git as root.

I had this in my personal .profile:
export DYLD_LIBRARY_PATH=/usr/lib
export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib:/sw/lib

Hashed it out and everything was fine..
Don't remember why I put it in there in the first place.. :-/

大家千万不要移除或重命名系统 /usr/lib 下的 libiconv,否则系统报各种问题,生不如死.

2. 解决方法:
$ vi ~/.bashrc

DYLD_LIBRARY_PATH=$HOME/local/lib:/usr/local/lib:/usr/local/mysql/lib
export DYLD_LIBRARY_PATH

DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib:/usr/lib
export DYLD_FALLBACK_LIBRARY_PATH

加入以后内容,通过小改变一下动态库的扫描路径的先后顺序,即可解决了

[转] mac port warning

https://gist.github.com/romanr/3192047

Warning: Your developer_dir setting in macports.conf points to a non-existing directory. Since this is known to cause problems, please correct the setting or comment it and let macports auto-discover the correct path.

xcode-select --print-path

sudo nano /opt/local/etc/macports/macports.conf

[转] Building ImageMagick on OSX Lion and can't link libpng

Building ImageMagick on OSX Lion and can't link libpng

Q:

I am trying to build ImageMagick 6.8.0-5 on OSX Lion with support for libpng. I am just using the standard ./configure make make install procedure.
I succeed in compiling when I do not reference libpng.

./configure --with-png=no
make

However, I get an error in make when I try to add libpng support. (libpng-1.5.13)

./configure --with-png=yes
make

The error seems to be a linker error.

/usr/bin/nm: no name list
ld: warning: cannot export hidden symbol _SyncImagePixelCache from magick/.libs/magick_libMagickCore_la-cache.o
ld: warning: cannot export hidden symbol _ResetQuantumState from magick/.libs/magick_libMagickCore_la-quantum.o
Undefined symbols for architecture x86_64:
  "_png_set_check_for_invalid_index", referenced from:
      _WriteOnePNGImage in magick_libMagickCore_la-png.o
      _ReadOnePNGImage in magick_libMagickCore_la-png.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make[1]: *** [magick/libMagickCore.la] Error 1
make: *** [all] Error 2

I have not changed any other options to configure.
How can I fix this to add libpng support?

A:
You'll need to tell ImageMagick where to locate libpng. Luckily, libpng ships with a configuration script entitled "libpng-config".
You can get the link-library option form your local libpng install with the --L_opts flag.

libpng-config --L_opts

This will return something like -L/usr/local/lib. Set ImageMagick's LDFLAGS configuration to match your libpng library.

# Use the returned value for the LDFLAGS
./configure LDFLAGS='-L/usr/local/lib'

If libpng-config returns with a message 'command not found', you'll need to ensure your libpng is installed correctly, and can be located in your shell environment. Often, this can be as simple as adding a custom path to your PATH variable.

export PATH="$PATH:/usr/local/bin"

git 如何取消跟踪某个文件呢？

$ git rm --cached FILENAME

就可以了.
该操作不会删除原来的文件,同时取消对文件的版本变化跟踪.

[转] 解决 ios 使用AdMob遇到 -[GADObjectPrivate changeState:]: unrecognized selector sent to instance 问题

解决 ios 使用AdMob遇到 -[GADObjectPrivate changeState:]: unrecognized selector sent to instance 问题

iso使用AdMob时如遇到-[GADObjectPrivate changeState:]: unrecognized selector sent to instance 0x968c980情况，请在编译选项里linking中的other link flag加上-ObjC，否则蛋碎都找不到原因。

[转] add Admob with Cocos2d-x on iOS

add Admob with Cocos2d-x on iOS

1. download admob, setup your account

2. add admob to xcode project. You need:

    - add libGoogleAdmobAds.a to bundle libraries

    - create a group and add admob header file

3.  in AppController.h, add member:     

@interface AppController : NSObject <

UIAccelerometerDelegate, UIAlertViewDelegate, UITextFieldDelegate,UIApplicationDelegate, GADBannerViewDelegate> {

    UIWindow *window;

    RootViewController    *viewController;

    GADBannerView* bannerView_;

}

4. in AppController.mm

    // setup admob

    

    // Create a view of the standard size at the bottom of the screen.

    // Available AdSize constants are explained in GADAdSize.h.

    bannerView_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner];

    bannerView_.delegate = self;

    // Specify the ad's "unit identifier." This is your AdMob Publisher ID.

    bannerView_.adUnitID = @"YOUR_ID";

    

    // Let the runtime know which UIViewController to restore after taking

    // the user wherever the ad goes and add it to the view hierarchy.

    bannerView_.rootViewController = viewController;

    [viewController.view addSubview:bannerView_];

    

    

    // Initiate a generic request to load it with an ad.

    GADRequest* adRequest = [GADRequest request];

    [bannerView_ loadRequest:adRequest];

    // start game

    cocos2d::CCApplication::sharedApplication()->run();

5. we are not over Yet!!!

    You'll have exceptions if running the app now. You must do this:

(http://stackoverflow.com/questions/12635283/admob-crashes-with-gadobjectprivate-changestate-unrecognized-selector)

You need to add -ObjC to the Other Linker Flags of your application target's build setting:

Click the blue top-level project icon in XCode

Choose your target and go to Build Settings

Under Other Linker Flags add -ObjC for both Release and Debug

Done!!!

Let's make money and go IPO :)

[转] Mac 中文件的 @ 权限(属性)

mac中文件的@权限(属性)

当我在看mac下的文件属性的时候，发现一件奇怪的事情, 就是有的文件权限最后会有个@符号. 这个我从没在linux下看到过, 想必有什么特殊的含义. (不过通过google找这个问题还是有点难度的)

类似:
-rw-r--r--@  1 yarco  staff    22369877  1 13  2010 Adium_1.3.10.dmg
-rw-r--r--@  1 yarco  staff    19386869  7 14 05:22 Firefox 3.6.7.dmg
-rw-r--r--@  1 yarco  staff     6384001  7 10 02:43 Growl-1.2.1.dmg
drwxr-xr-x   3 yarco  staff         102  7 21 22:50 MacPorts-1.9.1.pkg

最后找到一个帖子 forums.macosxhints.com/showthread.php 原来man ls里是有这个解释的(谁有空去读那么一大串文档哦...)
If the file or directory has extended
attributes, the permissions field printed by the -l option is followed by
a '@' character. Otherwise, if the file or directory has extended secu-
rity information, the permissions field printed by the -l option is fol-
lowed by a '+' character. 
@指 该文件有扩展的属性
+指该目录有扩展的安全信息

macbook:Downloads yarco$ ls -l@
total 7636752
-rw-r--r--@  1 yarco  staff    22369877  1 13  2010 Adium_1.3.10.dmg
com.apple.diskimages.fsck            20 
com.apple.diskimages.recentcksum            79 
com.apple.metadata:kMDItemWhereFroms           125 
com.apple.quarantine            74 
-rw-r--r--@  1 yarco  staff    19386869  7 14 05:22 Firefox 3.6.7.dmg
com.apple.diskimages.fsck            20 
com.apple.diskimages.recentcksum            79 
com.apple.metadata:kMDItemWhereFroms           242 
com.apple.quarantine            74 
-rw-r--r--@  1 yarco  staff     6384001  7 10 02:43 Growl-1.2.1.dmg
com.apple.diskimages.fsck            20 
com.apple.diskimages.recentcksum            80 
com.apple.metadata:kMDItemWhereFroms            88 
com.apple.quarantine            74 
drwxr-xr-x   3 yarco  staff         102  7 21 22:50 MacPorts-1.9.1.pkg

这下看清楚了吧...

也刻意通过xattr查看更多细节
$ xattr PhysicsEditor-1.0.10.dmg
com.apple.diskimages.fsck
com.apple.diskimages.recentcksum
com.apple.metadata:kMDItemWhereFroms
com.apple.quarantine

[转] Objective C 类方法

Objective C 类方法

一，Objective C  的类方法(class method)，即 static 方法，是用 + 修饰的方法。类方法是属于类对象的，所以无需创建类的实例对象我们就可以直接使用它们。使用形式为：

[ClassName classMethod];

在这里 ClassName 代表的就是一个类对象，而不是作为一种类型。类名只有出现在接收消息的表达式中才代表一个类对象，其他情况下都表示一种类型。

二，类方法可以继承自基类，就像普通的类成员方法一样。有一个特别的类方法 + (void) initialize，在类接收到任何消息之前，运行时系统会向类对象发送这个消息，因此我们可以在这个函数里对类对象做一些初始化，比如初始化 static 变量等等。在 NSObject 中，该方法什么也不做。

三，当类对象接收到一个消息却没有相应的类方法响应时，运行时系统会去检查是否存在一个 root (通常是 NSObject)的实例方法能够响应，如果能够响应就会执行 root 的成员方法来响应。只有在这种情况下，类对象才能够执行实例方法！再次声明类对象执行实例方法的条件：

1，类对象没有相应的类方法来响应某个发送至它的消息；
2，root 类定义了能够响应这个消息的实例方法。

四，类方法的返回值类型默认为 id，也能接受不定参数，这些都与实例方法是一致的。例如：

+ makeGroup:group, ...;

五，在类方法中使用 self 和 super，这时 self 和 super 指代的都是类对象，而非实例对象，这一点要特别注意。推荐的工厂方法写法如下，在这里使用 self class 而不是直接写类名，是为了应对子类调用该函数的情况。

+ (id) getInstance
{
    id instance = [[[self class] alloc] init];
    return [instance autorelease];
}

[转] Mac OS X 系统上类似 ldd 的工具

Mac OS X系统上类似 ldd 的工具

ldd是用来查看一个可执行文件中包括对哪些共享库的调用，但是在MAC OX X下似乎没有ldd，取而代之的是另一个叫otool的命令，使用该命令的-L命令可以实现ldd的功能。

ldd on Mac OS X

"ldd" in various flavors of Unix is used to check which dynamic libraries are used by the executable. There is no "ldd" command in Mac OS X (Convenient, huh?). Instead, Apple provides something that is talled "otool", which has many different options. One of them is "-L", which displays the linked libraries:

sparrow (13:18)$ otool -L h3dpost.x 

h3dpost.x:

/opt/local/lib/libmpi.0.dylib (compatibility version 1.0.0, current version 1.0.0)

/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.3)

/opt/local/lib/libmpi_f77.0.dylib (compatibility version 1.0.0, current version 1.0.0) 

/opt/local/lib/libopen-rte.0.dylib (compatibility version 1.0.0, current version 1.0.0) 

/opt/local/lib/libopen-pal.0.dylib (compatibility version 1.0.0, current version 1.0.0) 

/usr/local/lib/libgfortran.3.dylib (compatibility version 4.0.0, current version 4.0.0) 

/usr/local/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

from: http://schumakov.info/howto-osx.php