ubuntu:通过封装验证码类库一步步安装php的gd扩展

2018-02-27 09:00:17来源:cnblogs.com作者:ghostwu人点击

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我相信很多人的lamp环境都是直接复制一堆参数安装进去的,这里有可能成功,也有可能失败,如果是新手,估计要碰到各种错误,就算安装成功,也未必知道那些参数是干嘛的,反正装进去能用就行。

我当初开始的时候也是这样, 完全一脸懵逼,直到我后来进修了( C语言,Linux,Linux系统编程,计算机原理等 )才能玩转服务器配置,理解原理。

本文通过一个经典的验证码功能,告诉你如何按需安装扩展!!!

要封装一个php的验证码类库,那么需要gd扩展的支持,由于我之前的php是精简编译安装的,没有gd库的支持,所以要先安装php的gd库

要想成功安装gd库,需要安装很多的依赖: zlib, png, jpeg, libiconv, freetype

1,zlib我之前在安装 php memcache的扩展时候,已经安装过了

2,安装png

wget http://prdownloads.sourceforge.net/libpng/libpng-1.5.4.tar.gz?download

mv libpng-1.5.4.tar.gz/?download libpng-1.5.4.tar.gz

tar xf libpng-1.5.4.tar.gz

cd libpng-1.5.4/

./configure

make && sudo make install

3,安装jpeg

wget http://www.ijg.org/files/jpegsrc.v9b.tar.gz

tar xf jpegsrc.v9b.tar.gz

cd jpeg-9b/

./configure

make && sudo make install

4,安装libiconv

wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.15.tar.gz

tar xf libiconv-1.15.tar.gz

cd libiconv-1.15/

./configure

make && sudo make install

5,安装freeType

wget https://download.savannah.gnu.org/releases/freetype/freetype-2.9.tar.gz

tar xf freetype-2.9.tar.gz

cd freetype-2.9/

./configure

make && sudo make install

6,到了最关键的地方了,安装php gd扩展 

切换到php原码包下  ext/gd  这个目录

>先执行phpize外挂模块( /usr/local/php54/bin/phpize  )

>./configure --with-php-config=/usr/local/php54/bin/php-config -with-png-dir --with-freetype-dir --with-jpeg-dir -with-zlib-dir --with-gd 

>make && sudo make install

开始封装php验证码库,最后效果

  1 <?php  2   3 class Captcha {  4     //验证码字符个数  5     protected $num;  6     //宽度  7     protected $width;  8     //高度  9     protected $height; 10     //资源 11     protected $im; 12     //类型: 1:纯数字, 2:纯字母 3:数字与字母混合 13     protected $codeType; 14     //生成的验证码字符串 15     protected $codeString; 16  17     public function __construct( $_num = 4, $_width = 150, $_height = 50, $_codeType = 3 ){ 18         $this->num = $_num; 19         $this->width = $_width; 20         $this->height = $_height; 21         $this->codeType = $_codeType; 22         $this->codeString = $this->createCodeString(); 23     } 24  25     public function __get( $name ) { 26         if( $name == 'codeString' ) { 27             return $this->codeString; 28         } 29         return false; 30     } 31  32     protected function createCodeString(){ 33         switch( $this->codeType ){ 34             case 1: 35                 $code = $this->createNumCode(); 36                 break; 37             case 2: 38                 $code = $this->createCharCode(); 39                 break; 40             case 3: 41                 $code = $this->createNumCharCode(); 42                 break; 43             default: 44                 die( "暂时没有其他的验证码类型,你可以继承这个类来添加额" ); 45         } 46         return $code; 47     } 48  49     protected function createNumCode(){ 50         $numString = join( "", range( 0, 9 ) ); 51         return substr( str_shuffle( $numString ), 0, $this->num ); 52     } 53  54     protected function createCharCode(){ 55         $charString = join( "", range( 'a', 'z' ) ); 56         $charString .= strtoupper( $charString ); 57         return substr( str_shuffle( $numString ), 0, $this->num ); 58     } 59  60     protected function createNumCharCode(){ 61         $numCharString = join( "", range( 0, 9 ) ); 62         $charString = join( "", range( 'a', 'z' ) ); 63         $charString .= strtoupper( $charString ); 64         $mixedString = $numCharString . $charString; 65         return substr( str_shuffle( $mixedString ), 0, $this->num ); 66     } 67      68     protected function createCanvas(){ 69         $this->im = imagecreatetruecolor( $this->width, $this->height ); 70     } 71  72     protected function fillCanvas( $type ){ 73         switch( $type ) { 74             case 1: 75                 $color = imagecolorallocate( $this->im, mt_rand( 0, 150 ), mt_rand( 0, 150 ), mt_rand( 0, 150 ) ); 76                 break; 77             case 2: 78                 $color = imagecolorallocate( $this->im, mt_rand( 150, 255 ), mt_rand( 150, 255 ), mt_rand( 150, 255 ) ); 79                 break; 80             default: 81                 die( "不支持的填充类型" ); 82                 break; 83         } 84         imagefill( $this->im, 0, 0, $color ); 85     } 86  87     protected function drawCodeString(){ 88         for( $i = 0; $i < $this->num; $i++ ){ 89             $fontColor = imagecolorallocate( $this->im, mt_rand( 0, 255 ), mt_rand( 0, 255 ), mt_rand( 0, 255 ) ); 90             $char = $this->codeString[$i]; 91             $x = ( $i * ( ($this->width) / $this->num ) ) + mt_rand( 5, 10 ); 92             $y = mt_rand( 0, $this->height / 2 ) + mt_rand( 5, 10 ); 93             imagestring( $this->im, 5, $x, $y, $char, $fontColor ); 94         }             95     } 96  97     protected function renderImage(){ 98         header( "Content-type:image/png" ); 99         imagepng( $this->im );100     }101 102     protected function fillDisturb(){103             for( $i = 0; $i < 100; $i++ ){104                 $color = imagecolorallocate( $this->im, mt_rand( 0, 255 ), mt_rand( 0, 255 ), mt_rand( 0, 255 ) );105                 imagesetpixel( $this->im, mt_rand( 0, $this->width ), mt_rand( 0, $this->height ), $color );106             }107     }108 109     public function render(){110         //创建画布/背景111         $this->createCanvas();112         //填充画布颜色113         $this->fillCanvas( 1 );114         //填充干扰元素115         $this->fillDisturb();    116         //填充验证码117         $this->drawCodeString();118         //显示验证码119         $this->renderImage();120     }121 }122 123 $capt = new Captcha();124 //echo $capt->codeString . PHP_EOL;125 $capt->render();126 ?>

小结:

1,复习类库的封装

2,理解扩展安装原理 

  

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