PHP的GD库生成发光文字

用到一个开源库：

https://imagettftextblur.agjgd.org/examples/shadow/

github地址：https://github.com/andrewgjohnson/imagettftextblur

使用示例：

//引入文字发光
include __ROOTDIR__."libs/imagettftextblur/imagettftextblur.php";

// 背景颜色
$text_color = imagecolorallocate($im, 216, 227, 231);
$shadow_color = imagecolorallocate($im, 57, 47, 65);

//定义x轴在字体上增加的大小
            $xleft=6;
            foreach ($str as $k=>$v){

                if ($type=='1'){
                    //imagettftext($im, $size, 0, ($width-mb_strlen($v)*($size+$xleft))/2, ($height-$k*($size+56))/2+(count($str)*10), $text_color, $font, $v);
                    $x_offset=($width-mb_strlen($v)*($size+$xleft))/2;
                    $y_offset=($height-$k*($size+56))/2+(count($str)*10);
                }else{
                    //imagettftext($im, $size, 0, ($width-mb_strlen($v)*($size+$xleft))/2, ($height-$k*($size+36))/2+(count($str)*12), $text_color, $font, $v);
                    $x_offset=($width-mb_strlen($v)*($size+$xleft))/2;
                    $y_offset=($height-$k*($size+36))/2+(count($str)*12);
                }
                // place the shadow onto our image
                imagettftextblur($im, $size, 0, $x_offset + 5, $y_offset + 5, $shadow_color, $font,$v, 10);
                // place the text onto our image
                imagettftextblur($im, $size, 0, $x_offset, $y_offset, $text_color, $font, $v);
            }