wsa_server/libraries/Uploads.php

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

/**
 *  上传及图像处理
 */
class Uploads
{

    const DIR = 'uploads';
    const DIR_PET_IMG = 'pet_img';
    const DIR_PER_CERT_IMG = 'pet_cert_img';
    const DIR_PER_CERT_ZIP = 'pet_cert_zip';

    public function get_upload_path(){
    	return FCPATH.self::DIR.DIRECTORY_SEPARATOR;
	}

	/**
	 * 上传宠物证书base64
	 */
	public function save_cert_img_base64($content,$device_id,$filename)
	{
		$device_id = strtoupper($device_id);
		$upload_path = $this->get_upload_path();
		$pet_img_path = Uploads::DIR_PER_CERT_IMG.DIRECTORY_SEPARATOR.$device_id.DIRECTORY_SEPARATOR;
		$type = $this->base64_image_save(
			$content,
			$upload_path.$pet_img_path,
			$filename
		);
		if(!$type){
			return false;
		}
		//png转为jpg，降低文件大小
		$img = imagecreatefrompng($upload_path.$pet_img_path.$filename.'.'.$type);
		if($img){
			imagejpeg($img, $upload_path.$pet_img_path.$filename.'.jpg',75);
			imagedestroy($img);
			unlink($upload_path.$pet_img_path.$filename.'.'.$type);
		}
		return $filename.'.jpg';
	}


	/**
	 * 上传宠物头像
	 */
	public function save_pet_img_base64($content,$device_id)
	{
		$device_id = strtoupper($device_id);
		$upload_path = $this->get_upload_path();
		$pet_img_path = Uploads::DIR_PET_IMG.DIRECTORY_SEPARATOR;
		$type = $this->base64_image_save(
			$content,
			$upload_path.$pet_img_path,
			$device_id.'_ori'
		);
		if(!$type){
			return false;
		}
		$source = $pet_img_path.$device_id.'_ori.'.$type;
		$target = $pet_img_path.$device_id.'_300.'.$type;
		$ret = $this->image_center_crop($upload_path.$source, 300, 300, $upload_path.$target);
		if(!$ret){
			return $source;
		}
		return $target;
	}

	/**
	 * 上传图片
	 */
	public function upload_img($arr)
	{
		$list = array();
		foreach ($arr as $k => $v) {

			$name = $v['name'];
			$type = strtolower(substr($name, strrpos($name, '.') + 1)); // 得到文件类型，并且都转化成小写
			$allow_type = array(
				'jpg',
				'jpeg',
				'gif',
				'png',
				'mp4',
			); // 定义允许上传的类型
			// 判断文件类型是否被允许上传
			if (! in_array($type, $allow_type)) {
				// 如果不被允许，则直接停止程序运行
				return;
			}
			// 判断是否是通过HTTP POST上传的
			if (! is_uploaded_file($v['tmp_name'])) {
				// 如果不是通过HTTP POST上传的
				return;
			}

			$upload_path = FCPATH.self::DIR.DIRECTORY_SEPARATOR."users_info_img/";
			if (! file_exists($upload_path)) {
				mkdir($upload_path);
			}

			$img_id = time() . rand(1, 100) . "." . $type;

			$list[$k] ='users_info_img/'.$img_id;
			if (move_uploaded_file($v['tmp_name'], $upload_path . $img_id)) {

			} else {
				return;
			}
		}
		return $list[0];
	}

	/*  base64格式编码转换为图片并保存对应文件夹 */
	function base64_image_save($base64_image_content,$path,$name)
	{
		//匹配出图片的格式
		if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)) {
			$type = $result[2] === 'jpeg'?'jpg':$result[2];
			if (!file_exists($path)) {
				//检查是否有该文件夹，如果没有就创建，并给予最高权限
				mkdir($path, 0755);
			}
			$new_file = $name . ".{$type}";
			if (file_put_contents($path . $new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))) {
				return $type;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}

	/**
	 * 居中裁剪图片
	 * @param string $source [原图路径]
	 * @param int $width [设置宽度]
	 * @param int $height [设置高度]
	 * @param string $target [目标路径]
	 * @return bool [裁剪结果]
	 */
	public function image_center_crop($source, $width, $height, $target)
	{
		if (!file_exists($source)) return false;
		/* 根据类型载入图像 */
		switch (exif_imagetype($source)) {
			case IMAGETYPE_JPEG:
				$image = imagecreatefromjpeg($source);
				break;
			case IMAGETYPE_PNG:
				$image = imagecreatefrompng($source);
				break;
			case IMAGETYPE_GIF:
				$image = imagecreatefromgif($source);
				break;
		}
		if (!isset($image)) return false;
		/* 获取图像尺寸信息 */
		$target_w = $width;
		$target_h = $height;
		$source_w = imagesx($image);
		$source_h = imagesy($image);
		/* 计算裁剪宽度和高度 */
		$judge = (($source_w / $source_h) > ($target_w / $target_h));
		$resize_w = $judge ? ($source_w * $target_h) / $source_h : $target_w;
		$resize_h = !$judge ? ($source_h * $target_w) / $source_w : $target_h;
		$start_x = $judge ? ($resize_w - $target_w) / 2 : 0;
		$start_y = !$judge ? ($resize_h - $target_h) / 2 : 0;
		/* 绘制居中缩放图像 */
		$resize_img = imagecreatetruecolor($resize_w, $resize_h);
		imagecopyresampled($resize_img, $image, 0, 0, 0, 0, $resize_w, $resize_h, $source_w, $source_h);
		$target_img = imagecreatetruecolor($target_w, $target_h);
		imagecopy($target_img, $resize_img, 0, 0, $start_x, $start_y, $resize_w, $resize_h);
		/* 将图片保存至文件 */
		if (!file_exists(dirname($target))) mkdir(dirname($target), 0777, true);
		switch (exif_imagetype($source)) {
			case IMAGETYPE_JPEG:
				imagejpeg($target_img, $target);
				break;
			case IMAGETYPE_PNG:
				imagepng($target_img, $target);
				break;
			case IMAGETYPE_GIF:
				imagegif($target_img, $target);
				break;
		}
		return boolval(file_exists($target));
	}

}