How to create a round user avatar in php

fileName = $fileName; if(is_array($rgb)){ $this->rgb = $rgb; //rgb颜色数组 array(255,255,0) }else{ //有的人喜欢带#号 $rgb = trim($rgb, '#'); //处理缩写形式 if (strlen($rgb)==3){ $_tmp = $rgb[0].$rgb[0].$rgb[1].$rgb[1].$rgb[2].$rgb[2]; $rgb = $_tmp; } $this->rgb = $this->createRGB($rgb); //16进制值 ffff00 } $this->size = $size; $this->imgInfo = getimagesize($this->fileName); if(!$this->imgInfo){ throw Exception("无法读取图像文件"); } if(!in_array($this->imgInfo[2], array(2,3))){ //仅允许jpg和png throw Exception("图像格式不支持"); } } /** * 显示图像 * Enter description here ... */ public function show() { header("content-type:image/png"); $shadow = $this->createshadow(); //遮罩图片 //创建一个方形图片 $imgbk = imagecreatetruecolor($this->size, $this->size); //目标图片 switch ($this->imgInfo[2]){ case 2: $imgfk = imagecreatefromjpeg($this->fileName); //原素材图片 break; case 3: $imgfk = imagecreatefrompng($this->fileName); //原素材图片 default: return ; break; } $realSize = $this->imgInfo[0]<$this->imgInfo[1]? $this->imgInfo[0] : $this->imgInfo[1]; imagecopyresized($imgbk, $imgfk, 0, 0, 0, 0, $this->size, $this->size, $realSize, $realSize); imagecopymerge($imgbk, $shadow, 0, 0, 0, 0, $this->size, $this->size, 100); //创建图像 imagepng($imgbk); //销毁资源 imagedestroy($imgbk); imagedestroy($imgfk); imagedestroy($shadow); } /** * 创建一个圆形遮罩 * Enter description here ... * @param array 10进制颜色数组 */ private function createshadow() { $img = imagecreatetruecolor($this->size, $this->size); imageantialias($img, true); //开启抗锯齿 $color_bg = imagecolorallocate($img, $this->rgb[0], $this->rgb[1], $this->rgb[2]); //背景色 $color_fg = imagecolorallocate($img, 0, 0, 0); //前景色，主要用来创建圆形 imagefilledrectangle($img, 0, 0, 200, 200, $color_bg); imagefilledarc($img, 100, 100, 200, 200, 0, 0, $color_fg, IMG_ARC_PIE); imagecolortransparent($img, $color_fg); //将前景色转换为透明 return $img; } /** * 将字符形式16进制串转为10进制 * Enter description here ... * @param $str */ private function getIntFromHexStr($str) { $format = '0123456789abcdef'; $sum = 0; for($i=strlen($str)-1, $c=0, $j=0; $i>=$c; $i--,$j++){ $index = strpos($format, $str[$i]);//strpos从0计算 $sum+=$index * pow(16,$j); } return $sum; } /** * 将16进制颜色转为10进制颜色值数组（RGB） * Enter description here ... * @param $str 16进制串（如：ff9900） */ private function createRGB($str) { $rgb = array(); if(strlen($str) != 6){ $rgb[] = 0xff; $rgb[] = 0xff; $rgb[] = 0xff; return $rgb; //默认白色 } $rgb[] = $this->getIntFromHexStr(substr($str, 0, 2)); $rgb[] = $this->getIntFromHexStr(substr($str, 2, 2)); $rgb[] = $this->getIntFromHexStr(substr($str, 4, 2)); return $rgb; } }