How to create a round user avatar using php

Ideas

Using the layer method to design, a total of 3 image layers need to be created

1. Bottom layer: the final generated image

2. Real user avatar: As the middle layer, the real avatar image uploaded by the user

3. Circular mask: As the top layer, draw a circle in the mask and set it to transparent

As shown in the figure:

The code is as follows:

Main function class avatar.class.php

<?php
    class avatar {
    private $fileName;
    //文件的绝对路径（或基于最终调用文件的相对路径） private $rgb;
    //颜色索引（数组 array(255,255,0) 或 16进制值 ffff00/#ffff00/ff0/#ff0） private $size;
    //图像大小 private $imgInfo;
    //图像信息 
/** * 初始化 * Enter description here ... * @param string $fileName 文件的绝对路径（或基于最终调用文件的相对路径） * @param mixed $rgb 颜色索引（数组 array(255,255,0) 或 16进制值 ffff00/#ffff00/ff0/#ff0） * @param int $size 图像大小*/
    public function __construct($fileName, $rgb, $size) {
    $this->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, &#39;#&#39;);
    //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 = &#39;0123456789abcdef&#39;;
    $sum = 0;
    for($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;
}
}

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