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1.ʹÓùٷ½ÑéÖ¤Âë²å¼þ

ÔÚ¹Ù·½ÎĵµÖУ¬ÎÒÃÇ¿ÉÒÔÕÒµ½ThinkPHPÑéÖ¤Âë²å¼þµÄʹÓÃÒªÁ졣ʹÓùٷ½²å¼þÐèÒªÖ´ÐÐÒÔÏ°취£º

1.1ÔÚThinkPHP¿ò¼ÜµÄextendĿ¼ÏÂн¨Ò»¸öVerifyÎļþ¼Ð£¬²¢½«ÏÂÔغõÄÑéÖ¤Âë²å¼þ·ÅÈëÆäÖС£

Á¬Ã¦Ñ§Ï°¡°PHPÃâ·ÑѧϰÌõ¼Ç£¨ÉîÈ룩¡± £»

1.2Éó²éThinkPHPÉèÖÃÎļþ£¬½«ÑéÖ¤ÂëÉèÖÃÏîÖ¸Ïò¸Õ°²ÅÅÑéÖ¤Âë²å¼þµÄÎļþ¼Ð¡£Ïêϸ´úÂëÈçÏ£º

'verify' =>[
    //ʹÓÃÖÐÎÄÑéÖ¤Âë
    'useZh'=>false,
    //ÑéÖ¤Âë×ÖÌå¾Þϸ(px)
    'fontSize'=>25,
    //ÑéÖ¤ÂëλÊý
    'length'=>5,
    //ÑéÖ¤ÂëͼƬ¿í¶È(ÏñËØ)
    'imageW'=>0,
    //ÑéÖ¤ÂëͼƬ¸ß¶È(ÏñËØ)
    'imageH'=>0,
    //¹Ø±ÕÑéÖ¤ÂëÔÓµã 
    'useNoise'=>true,
    //Åä¾°ÑÕÉ«(16½øÖÆÉ«Öµ)
    'bg'=>[243, 251, 254],
    //ÐèÒª°üÀ¨µÄ×Ö·ûÜöÝÍ
    'codeSet'=>'0123456789',
    //ÑéÖ¤Âë×Ö·û¾àÀë(px)
    'seKey'=>"ThinkPHP.CN_",//ÃÜÔ¿
    ...
],

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1.3ÔÚÐèÒªÊä³öÑéÖ¤ÂëµÄµØ·½£¬Ê¹ÓÃÒÔÏ´úÂë¼´¿É¼¯³É¹Ù·½ÑéÖ¤Âë²å¼þ£º

$img = ( new \Think\Verify())->entry();  
echo $img;

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2.ÊÖ¶¯±àдÑéÖ¤ÂëÌìÉú´úÂë

³ýÁËʹÓùٷ½²å¼þ£¬ÎÒÃÇ»¹¿ÉÒÔÊÖ¶¯±àдÑéÖ¤ÂëÌìÉú´úÂë¡£ÏêϸÁ÷³ÌÈçÏ£º

Ê×ÏÈ£¬ÎÒÃÇÐèÒª½¨ÉèÒ»¸öÑéÖ¤ÂëÀ࣬ÆäÖаüÀ¨ÌìÉúºÍÊä³öÑéÖ¤ÂëµÄÒªÁì¡£ÒÔÏ´úÂëΪÊÖ±àÑéÖ¤ÂëÀàµÄÖ÷Òª²¿·Ö£º

class VerifyCode
{
    //ÑéÖ¤Âë×Ö·û³¤¶È
    private $length = 4;

    //ÑéÖ¤Âë×Ö·ûÊý×é
    private $codes = [];

    //ÑéÖ¤ÂëÌìÉú
    public function generate()
    {   
        //ÌìÉú×Ö·ûÊý×é
        $this->codes = [];
        for($i = 0; $i < $this->length; ++$i) {
            $this->codes[] = chr(mt_rand(48, 57));
        }

        //ÉúÑÄ×Ö·ûÊý×éµ½sessionÖÐ
        session('verifycode', implode('', $this->codes));

        //¿ªÆôÊä³ö»º´æ
        ob_start();
        header('Content-Type:/image/png');

        //½¨ÉèÑéÖ¤ÂëͼƬ
        $image = imagecreate(100, 40);

        //ÉèÖû­²¼Åä¾°ÑÕÉ« 
        $bg_color = imagecolorallocate($image, 238, 238, 238); 
        imagefill($image, 0, 0, $bg_color);

        //»æÖÆÑéÖ¤Âë×Ö·û
        for($i = 0; $i < $this->length; ++$i) {
            $font_file = '/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf';
            $text_color = imagecolorallocate(
                $image, mt_rand(0, 150), mt_rand(0, 150), mt_rand(0, 150));
            imagettftext($image, 24, mt_rand(-20, 20), 5 + $i * 25, 30, 
                         $text_color, $font_file, $this->codes[$i]);
        }

        //Êä³öÑéÖ¤ÂëͼƬ
        imagepng($image);
        imagedestroy($image);
        $img = ob_get_contents();
        ob_end_clean();

        return $img;
    }
}

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2.2ʹÓÃÒÔÏ´úÂë¼´¿ÉÔÚÑéÖ¤ÐèÒªÑéÖ¤ÂëµÄµØ·½ÌìÉú²¢Êä³öÑéÖ¤Â룺

$vf = new VerifyCode();
echo $vf->generate();

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