How to use GD library in php to turn a square picture into a circular picture (code)

The content of this article is about the method (code) of using PHP to convert a square image into a circular image using the GD library. It has a certain reference value. Friends in need can refer to it. I hope it will be helpful to you. helped.

When we get the WeChat avatar, we will find it is square when we grab it, but in reality we usually use circles.

Below I will introduce the use of PHP native GD library to capture the image and cut it into rounded corners. In fact, the code is very simple, so I will just upload the code.

<?php
    $path = "";//文件绝对路径
    $this->yuanjio($path);
     /*
     * 将图片切成圆角
     */
    public function yuanjiao($imgpath){
        $ext     = pathinfo($imgpath);
        $src_img = null;
        switch ($ext[&#39;extension&#39;]) {
            case &#39;jpg&#39;:
                $src_img = imagecreatefromjpeg($imgpath);
                break;
            case &#39;png&#39;:
                $src_img = imagecreatefrompng($imgpath);
                break;
        }
        $wh  = getimagesize($imgpath);
        $w   = $wh[0];
        $h   = $wh[1];
        $w   = min($w, $h);
        $h   = $w;
        $img = imagecreatetruecolor($w, $h);
        //这一句一定要有
        imagesavealpha($img, true);
        //拾取一个完全透明的颜色,最后一个参数127为全透明
        $bg = imagecolorallocatealpha($img, 255, 255, 255, 127);
        imagefill($img, 0, 0, $bg);
        $r   = $w / 2; //圆半径
        $y_x = $r; //圆心X坐标
        $y_y = $r; //圆心Y坐标
        for ($x = 0; $x < $w; $x++) {
            for ($y = 0; $y < $h; $y++) {
                $rgbColor = imagecolorat($src_img, $x, $y);
                if (((($x - $r) * ($x - $r) + ($y - $r) * ($y - $r)) < ($r * $r))) {
                    imagesetpixel($img, $x, $y, $rgbColor);
                }
            }
        }
        return $img;
    }

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