PHP 生成一张图片的两种方法

<span style="white-space:pre">	</span>//默认的logo	private function generation_default_img($width,$height,$img_type,$output_url)	{		//检查默认logo是否存在		if(file_exists($output_url))		{				return;		}		else		{			//新建一个真彩色图像，返回一个图像标识符			header ('Content-Type: image/png');			$im = imagecreate($width, $height);	        <span style="white-space:pre">	</span>//分配颜色	        <span style="white-space:pre">	</span>$bg_color = imagecolorallocate($im, 255, 255, 255);<span style="white-space:pre">	</span>	        //画一个矩形并填充	<span style="white-space:pre">	</span>        imagefilledrectangle($im, 0, 0, $width, $height, $bg_color);	        <span style="white-space:pre">	</span>imagepng($im,$output_url);<span style="white-space:pre">	</span>	        imagedestroy($im);		}	}

<span style="white-space:pre">	</span>//默认的logo	private function generation_default_img($width,$height,$img_type,$output_url)	{		//构建画布       <span style="white-space:pre">		</span> $obj_default = new Imagick();        <span style="white-space:pre">	</span>$obj_default -> newimage($width, $height, 'white');<span style="white-space:pre">	</span>        $obj_default -> setimageformat($img_type);        <span style="white-space:pre">	</span>$obj_default -> writeimage($output_url);<span style="white-space:pre">	</span>        $obj_default -> clear();        <span style="white-space:pre">	</span>//销毁对象<span style="white-space:pre">	</span>        $obj_default -> destroy();	}