//裁剪

function get_thumb_img($old_src){

$new_src= "******/".time().rand(0,5000).rand(5000,10000).'_n.jpg';

$old_info= getimagesize($old_src);

switch($old_info[2]){

case 1:$im = imagecreatefromgif($old_src);break;

case 2:$im = imagecreatefromjpeg($old_src);break;

case 3:$im = imagecreatefrompng($old_src);break;

case 4:$im = imagecreatefromjpeg("/img/swf.jpg");break;

case 6:return false;

}

$old_width = imagesx($im);

$old_height = imagesy($im);

//创建源图的实例

$src = imagecreatefromstring(file_get_contents($old_src));

//裁剪开区域左上角的点的坐标

$x = 0;

$y = 0;

//裁剪区域的宽和高

$height = $old_height;

$width = $height*1.32;

//最终保存成图片的宽和高，和源要等比例，否则会变形

$final_width = $width;

$final_height = round($final_width * $height / $width);

//将裁剪区域复制到新图片上，并根据源和目标的宽高进行缩放或者拉升

$new_image = imagecreatetruecolor($final_width, $final_height);

imagecopyresampled($new_image, $src, 0, 0, $x, $y, $final_width, $final_height, $width, $height);

//输出图片

//imagejpeg($new_image);

imagejpeg($new_image,$new_src,100);//对图像进行截图

imagedestroy($src);

imagedestroy($new_image);

$url= str_replace('/opt****2/baby','http://w******om',$new_src);

return $url;

}

//缩略图

function weekend_cut_photo($old_src,$new_src,$new_width,$new_height,$rate=100){

//参数：源文件地址，缩略图地址，缩略图宽，缩略图高，缩略图质量：0~100

//成功返回1，格式不符合返回2，生成图片失败返回3

//长宽不高于给定参数

$old_info = getimagesize($old_src);

switch($old_info[2]){

case 1:$im = imagecreatefromgif($old_src);break;

case 2:$im = imagecreatefromjpeg($old_src);break;

case 3:$im = imagecreatefrompng($old_src);break;

case 4:$im = imagecreatefromjpeg("/img/swf.jpg");break;

case 6:return false;

}

if(!$im) return 2;

$old_width = imagesx($im);

$old_height = imagesy($im);

if($old_width

imagejpeg($im,$new_src,$rate);

imagedestroy($im);

return 1;

}

$x_rate = $old_width/$new_width;

$y_rate = $old_height/$new_height;

if($x_rate

$dst_x = ceil($old_width/$y_rate);

$dst_y = $new_height-1;

$new_start_x = 0;

$new_start_y = 0;

}else{

$dst_x = $new_width;

$y_rate = $old_height/$new_height;

if($x_rate

$dst_x = ceil($old_width/$y_rate);

$dst_y = $new_height-1;

$new_start_x = 0;

$new_start_y = 0;

}else{

$dst_x = $new_width;

$dst_y = ceil($old_height/$x_rate);

$new_start_x = 0;

$new_start_y = 0;

}

$newim = imagecreatetruecolor($dst_x,$dst_y);//先压缩

$bg = imagecolorallocate($newim,255,255,255);

imagefilledrectangle($newim,0,0,$dst_x,$dst_y,$bg); //画个大小一致矩形充当背景

imagecopyresampled($newim,$im,0,0,0,0,$dst_x,$dst_y,$old_width,$old_height);

$cutim = imagecreatetruecolor($dst_x,$dst_y);//对图像进行截图

imagecopyresampled($cutim,$newim,0,0,$new_start_x,$new_start_y,$new_width,$new_height,$new_width,$new_height);

imagejpeg($cutim,$new_src,$rate);//对图像进行截图

imagedestroy($im);

imagedestroy($newim);

$a = imagedestroy($cutim);

if($a){

return 1;

}else{

return 3;

}

}

}

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