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php图像处理常用函数与实例

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Release: 2016-06-13 09:48:14
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简单的生成验证码图片代码

header("Content-type: image/jpeg");
// 载入图像
$imagen1 = imagecreatefromjpeg("imagen1.jpg");
$imagen2 = imagecreatefromjpeg("imagen2.jpg");

// 复制图像www.bKjia.c0m
imagecopy($imagen1,$imagen2,0,0,0,0,200,150);

// 输出jpeg图像
imagejpeg($imagen1);

//释放内存
imagedestroy($imagen2);
imagedestroy($imagen1);

?>

获取图片属性代码

$info = getimagesize("imagen2.jpg");
print_r($info);

?>

生成png图片的php代码

//PNG格式图像处理函数
function Loadpng ($imgname) {
    $im = @ImageCreateFromPNG ($imgname);
    if (!$im) {    //载入图像失败                     
        $im = ImageCreate (400, 30);     
        $bgc = ImageColorAllocate ($im, 255, 255, 255);
        $tc  = ImageColorAllocate ($im, 0, 0, 0);
       ImageFilledRectangle ($im, 0, 0, 150, 30, $bgc);
       ImageString($im, 4, 5, 5, "Error loading: $imgname", $tc);
    }
    return $im;
 }
 $imgPng=Loadpng("./karte.png");
   /* 输出图像到浏览器 */
 header("Content-type: image/png");
 imagePng($imgPng);
 ?>

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