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use thinkcaptchaCaptcha;

//ÏÔʾÑéÖ¤Âë
public function verify(){
    $captcha = new Captcha();
    return $captcha->entry();
}

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<img src="{:captcha_src()}" alt="captcha" onclick="this.src='{:captcha_src()}?t='+Math.random();">

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//ÑéÖ¤ÑéÖ¤Âë
if (!captcha_check(input('post.captcha'))) {
    return json([
        'status' => '0',
        'msg' => 'ÑéÖ¤Âë¹ýʧ£¡'
    ]);
}

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2.2 ÑéÖ¤Âë²»Çø·Ö¾ÞϸдµÄÎÊÌâ

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$captcha = new Captcha(['useZh' => false, 'useImgBg' => true, 'fontSize' => 20, 'useNoise' => true, 'length' => 4, 'useCurve' => false, 'fontttf' => '4.ttf', 'bg' => [151, 232, 66], 'reset' => true, 'codeSet' => '0123456789', 'expire' => 300, 'zhSet' => '']);

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header('Access-Control-Allow-Origin: *');

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header('P3P: CP=CAO PSA OUR');
session_start();

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