php图像生成函数之间的区别分析_基础知识-JS Tutorial-php.cn

php图像生成函数之间的区别分析_基础知识

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Release： 2016-05-16 17:47:08

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新手对php图像生成函数imagecreatetruecolor()和imagecreate()又不解之处，首先来看看官方对这两个函数的解释：
resource imagecreatetruecolor ( int $x_size , int $y_size )
返回一个图像标识符，代表了一幅大小为 x_size 和 y_size 的黑色图像。
resource imagecreate ( int $x_size , int $y_size )
返回一个图像标识符，代表了一幅大小为
两者在改变背景颜色时有些区别：
imagecreatetruecolor需要用imagefill()来填充颜色
imagecreate()需要用imagecolorAllocate()添加背景色
php案例如下：

复制代码代码如下:

 
$img = imagecreatetruecolor(100,100); //创建真彩图像资源 
$color = imagecolorAllocate($img,200,200,200); //分配一个灰色 
imagefill($img,0,0,$color); // 从左上角开始填充灰色 
header('content-type:image/jpeg'); //jpg格式 
imagejpeg($img); //显示灰色的方块 
?> 

复制代码代码如下:

 
$img = imagecreate(100,100); 
imagecolorallocate($img,200,200,200); 
header('content-type:image/jpeg'); 
imagejpeg($img); 
?> 

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php图像生成函数之间的区别分析_基础知识