微信的头像现在要加水印到一张图片上 弄成 圆形的 怎么裁剪呢
Imagick提供的有 gd库 怎么做呢
因为要在微信中生成这个图片发送给用户 所以必须是生成这样的图片的 css的border-radius是只能显示网页中 怎么生成一个图片呢
已找到方法
function resize_img($url,$path=\'./\'){ $imgname = $path.uniqid().\'.jpg\'; $file = $url; list($width, $height) = getimagesize($file); //获取原图尺寸 $percent = (110/$width); //缩放尺寸 $newwidth = $width * $percent; $newheight = $height * $percent; $src_im = imagecreatefromjpeg($file); $dst_im = imagecreatetruecolor($newwidth, $newheight); imagecopyresized($dst_im, $src_im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); imagejpeg($dst_im, $imgname); //输出压缩后的图片 imagedestroy($dst_im); imagedestroy($src_im); return $imgname; } function test($url,$path=\'./\'){ $w = 132; $h=132; // original size 微信默认头像大小 高132,宽132 $original_path= $url; $dest_path = $path.uniqid().\'.png\'; $src = imagecreatefromstring(file_get_contents($original_path)); $newpic = imagecreatetruecolor($w,$h); imagealphablending($newpic,false); $transparent = imagecolorallocatealpha($newpic, 0, 0, 0, 127); $r=$w/2; for($x=0;$x<$w;$x++) for($y=0;$y<$h;$y++){ $c = imagecolorat($src,$x,$y); $_x = $x - $w/2; $_y = $y - $h/2; if((($_x*$_x) + ($_y*$_y)) < ($r*$r)){ imagesetpixel($newpic,$x,$y,$c); }else{ imagesetpixel($newpic,$x,$y,$transparent); } } imagesavealpha($newpic, true); imagepng($newpic, $dest_path); imagedestroy($newpic); imagedestroy($src); // unlink($url); return $dest_path; }