Home Backend Development PHP Tutorial PHP图像处理类库MagickWand用法实例分析_PHP

PHP图像处理类库MagickWand用法实例分析_PHP

May 30, 2016 am 08:47 AM
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本文实例讲述了PHP图像处理类库MagickWand用法。分享给大家供大家参考。具体分析如下:

MagickWand 是PHP的一个扩展程序,通过它建立起与ImageMagick的交互,进行图片的处理。它是默认的GD图象函数库的绝佳替代方案。从安全性和易用性来说,在PHP中使用MagickWand比使用命令行ImageMagick要安全快捷的多。另外 imagick也可用于PHP中作为ImageMagick的替代方案。

MagickWand 有两种形式,

只是建立与ImageMagick的交互,这种情况必须先安装ImageMagick,优点是扩展程序文件小(一般几百K),可以快速升级ImageMagick版本,不过WINDOWS临时目录需要特殊权限。

扩展程序本身包含了ImageMagick,优点是不需要额外安装ImageMagick,临时目录不需要特殊权限,但扩展程序文件比较大(一般4M以上)。

MagickWand 默认并没有在PHP的安装包里,需要去PHP网站上下载,并在PHP.INI中打开此扩展。

下面是一个使用 MagicWand 的代码片段:

$magick_wand=NewMagickWand();
MagickReadImage($magick_wand,'rose.jpg');
$drawing_wand=NewDrawingWand();
DrawSetFont($drawing_wand,"/usr/share/fonts/bitstream-vera/Vera.ttf");
DrawSetFontSize($drawing_wand,20);
DrawSetGravity($drawing_wand,MW_CenterGravity);
$pixel_wand=NewPixelWand();
PixelSetColor($pixel_wand,"white");
DrawSetFillColor($drawing_wand,$pixel_wand);
if (MagickAnnotateImage($magick_wand,$drawing_wand,0,0,0,"Rose") != 0)
{
  MagickEchoImageBlob( $magick_wand );
}
else
{
  echo MagickGetExceptionString($magick_wand);
}

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安装方法:

1. 下载 php_magickwand_q16_st.dll for 5.2.x
2. 将其放在PHP的扩展目录
3. 在php.ini文件总增加 extension=php_magickwand_q16_st.dll
4. 重新启动apache

希望本文所述对大家的php程序设计有所帮助。

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