使用接口api调用tp5验证码验证时一直提示失败的解决方案

大家都知道，thinkphp框架的特点就是MVC模式，验证码也是基于MVC开发的，所以验证码是Session存储的，Session存储在接口端，当我们访问了浏览器才会执行Session，所以我们通过接口调用的方式保存登录信息不行，验证码也不行。那该怎么办呢，下面来介绍下详细的解决步骤。

解决原理就是将验证码对Session改成Cache缓存，没错，就是这么干，只需要修改两个地方即可。

1）找到Captcha的源文件：vendor/topthink/think-captcha/src/Captcha.php

修改：

/*** 验证验证码是否正确* @access public* @param string $code 用户验证码* @param string $id   验证码标识* @return bool 用户验证码是否正确*/public function check($code, $id = ''){$key = $this->authcode($this->seKey) . $id;// 验证码不能为空$secode = Cache::get($key, ''); //在这里把Session换成Cacheif (empty($code) || empty($secode)) {return false;}// session 过期if (time() - $secode['verify_time'] > $this->expire) {Session::delete($key, '');return false;}if ($this->authcode(strtoupper($code)) == $secode['verify_code']) {$this->reset && Session::delete($key, '');return true;}return false;}

2）在同一个文件中找到生成验证码的方法，同样将Session改成Cache

/*** 输出验证码并把验证码的值保存的session中* 验证码保存到session的格式为： array('verify_code' => '验证码值', 'verify_time' => '验证码创建时间');* @access public* @param string $id 要生成验证码的标识* @return \think\Response*/public function entry($id = ''){// 图片宽(px)$this->imageW || $this->imageW = $this->length * $this->fontSize * 1.5 + $this->length * $this->fontSize / 2;// 图片高(px)$this->imageH || $this->imageH = $this->fontSize * 2.5;// 建立一幅 $this->imageW x $this->imageH 的图像$this->_image = imagecreate($this->imageW, $this->imageH);// 设置背景imagecolorallocate($this->_image, $this->bg[0], $this->bg[1], $this->bg[2]);// 验证码字体随机颜色$this->_color = imagecolorallocate($this->_image, mt_rand(1, 150), mt_rand(1, 150), mt_rand(1, 150));// 验证码使用随机字体$ttfPath = __DIR__ . '/../assets/' . ($this->useZh ? 'zhttfs' : 'ttfs') . '/';if (empty($this->fontttf)) {$dir  = dir($ttfPath);$ttfs = [];while (false !== ($file = $dir->read())) {if ('.' != $file[0] && substr($file, -4) == '.ttf') {$ttfs[] = $file;}}$dir->close();$this->fontttf = $ttfs[array_rand($ttfs)];}$this->fontttf = $ttfPath . $this->fontttf;if ($this->useImgBg) {$this->_background();}if ($this->useNoise) {// 绘杂点$this->_writeNoise();}if ($this->useCurve) {// 绘干扰线$this->_writeCurve();}// 绘验证码$code   = []; // 验证码$codeNX = 0; // 验证码第N个字符的左边距if ($this->useZh) {// 中文验证码for ($i = 0; $i < $this->length; $i++) {$code[$i] = iconv_substr($this->zhSet, floor(mt_rand(0, mb_strlen($this->zhSet, 'utf-8') - 1)), 1, 'utf-8');imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $this->fontSize * ($i + 1) * 1.5, $this->fontSize + mt_rand(10, 20), $this->_color, $this->fontttf, $code[$i]);}} else {for ($i = 0; $i < $this->length; $i++) {$code[$i] = $this->codeSet[mt_rand(0, strlen($this->codeSet) - 1)];$codeNX += mt_rand($this->fontSize * 1.2, $this->fontSize * 1.6);imagettftext($this->_image, $this->fontSize, mt_rand(-40, 40), $codeNX, $this->fontSize * 1.6, $this->_color, $this->fontttf, $code[$i]);}}// 保存验证码$key                   = $this->authcode($this->seKey);$code                  = $this->authcode(strtoupper(implode('', $code)));$secode                = [];$secode['verify_code'] = $code; // 把校验码保存到session$secode['verify_time'] = time(); // 验证码创建时间Cache::set($key . $id, $secode, '');  //这个地方也是将Session改成Cacheob_start();// 输出图像imagepng($this->_image);$content = ob_get_clean();imagedestroy($this->_image);return response($content, 200, ['Content-Length' => strlen($content)])->contentType('image/png');}