php GD 圆图 -处理成圆图片

 1 <?php 2 ?/** 3 ?* 处理成圆图片,如果图片不是正方形就取最小边的圆半径,从左边开始剪切成圆形 4 ?* @param ?string $imgpath [description] 5 ?* @return [type] ?????????[description] 6 ?*/ 7 ????function yuan_img($imgpath = ‘./code_png/share.jpg‘) { 8 ????????$ext ????= pathinfo($imgpath); 9 ????????$src_img = null;10 ????????switch ($ext[‘extension‘]) {11 ????????????case ‘jpg‘:12 ????????????????$src_img = imagecreatefromjpeg($imgpath);13 ????????????????break;14 ????????????case ‘png‘:15 ????????????????$src_img = imagecreatefrompng($imgpath);16 ????????????????break;17 ????????}18 ????????$wh ?= getimagesize($imgpath);19 ????????$w ??= $wh[0];20 ????????$h ??= $wh[1];21 ????????$w ??= min($w, $h);22 ????????$h ??= $w;23 ????????$img = imagecreatetruecolor($w, $h);24 ????????//这一句一定要有25 ????????imagesavealpha($img, true);26 ????????//拾取一个完全透明的颜色,最后一个参数127为全透明27 ????????$bg = imagecolorallocatealpha($img, 255, 255, 255, 127);28 ????????imagefill($img, 0, 0, $bg);29 ????????$r ??= $w / 2; //圆半径30 ????????$y_x = $r; //圆心X坐标31 ????????$y_y = $r; //圆心Y坐标32 ????????for ($x = 0; $x < $w; $x++) {33 ????????????for ($y = 0; $y < $h; $y++) {34 ????????????????$rgbColor = imagecolorat($src_img, $x, $y);35 ????????????????if (((($x - $r) * ($x - $r) + ($y - $r) * ($y - $r)) < ($r * $r))) {36 ????????????????????imagesetpixel($img, $x, $y, $rgbColor);37 ????????????????}38 ????????????}39 ????????}40 41 ????????return $img;42 }43 44 Header("Content-Type: image/png");45 imagepng(yuan_img());