PHP Tutorial—Creating a Round User Avatar

In current PHP development, most programmers will develop some functions such as user registration. Sometimes, for the sake of beauty, user avatars will also have corresponding requirements. So below we will tell you how to make circles with PHP. User avatar.

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 Middle layer, the real avatar picture uploaded by the user

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

The code is as follows:

<?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 deion 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 deion 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 deion 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 deion 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 deion 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;
}
}

That’s it for the PHP tutorial. When we complete a development using PHP, we really feel a sense of accomplishment, so now Friends who don’t know how to do it, hurry up and follow the tutorial to make one yourself.

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