Super simple PHP large image generation thumbnail implementation code_PHP tutorial

超简单php教程 大图生成缩略图实现代码

 

/**
* Generate thumbnails
*
* @param string $imagepath image path
* @param string $thumb Generate thumbnail name
* @param integer $width Maximum width of generated thumbnail
* @param integer $height The maximum height of generated thumbnail
*

*/
function resizeimage($imagepath, $thumb, $width = 200, $height = 200)
{
    list($imagewidth, $imageheight) = getimagesize($imagepath);
    $imagepath = imagecreatefromjpeg($imagepath);
    if ($width && ($imagewidth < $imageheight))
    {
        $width = ($height / $imageheight) * $imagewidth;
    }
    else
    {
        $height = ($width / $imagewidth) * $imageheight;
    }
    $image = imagecreatetruecolor($width, $height);
    imagecopyresampled($image, $imagepath, 0, 0, 0, 0, $width, $height, $imagewidth, $imageheight);
    imagepng($image, $thumb);
    imagedestroy($image);
}
resizeimage('test.jpg', 'test_thumb.jpg');
?>

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