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verifyCode£ºÑéÖ¤Óû§ÊäÈëµÄÑéÖ¤ÂëÊÇ·ñ׼ȷ¡£

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public function generateCode($width=80,$height=22,$verifyName=''){
    //ÌìÉúÒ»¸ö4λµÄËæ»ú×Ö·û´®
    $code = '';
    $chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    for($i=0;$i<4;$i++){
        $code .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    //½«ÑéÖ¤Âë´æ´¢µ½sessionÖÐ
    if($verifyName){
        session($verifyName, $code);
    }else{
        session('verify_code', $code);
    }

    //ÌìÉúÑéÖ¤ÂëͼÏñ
    $img = imagecreate($width,$height);
    //Åä¾°ÖÂ
    imagecolorallocate($img, 102,102,102);
    //×ÖÌåÑÕÉ«
    $color = imagecolorallocate($img, 255, 255, 255);
    //ÌìÉú×ÌÈÅÏß
    for($i=0;$i<5;$i++){
        imageline($img,mt_rand(0,$width/2),mt_rand(0,$height/2),mt_rand($width/2,$width),mt_rand($height/2,$height),$color);
    }
    //½«ÑéÖ¤Âë»æÖƵ½Í¼ÏñÉÏ
    imagefttext($img, 18, 0, 10, $height-5, $color, './arial.ttf', $code);
    //Êä³öͼÏñ
    header('Pragma:no-cache');
    header('Cache-Control:no-cache');
    header("content-type:image/png");
    imagepng($img);
    imagedestroy($img);
}

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// ÑéÖ¤ÂëÑéÖ¤
if(empty($verify)) {
    $this->error('ÑéÖ¤Âë²»¿ÉΪ¿Õ£¡');
}
if($verify != session('verify_code')){
    $this->error("ÑéÖ¤Âë¹ýʧ£¡");
}

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