When writing verification code in PHP, the online code editor can display it, but when placed on the local website, the code is garbled?

Question

<?php

check_code();

//Randomly generate characters or numbers for the verification code

function check_code($width=100, $height=50,$num=4, $type='jpeg')

{

$i=imagecreate($width,$height) ;

            $string=''; =mt_rand(0,2);

            switch($rand)

                                                                                                                                        switch($rand) ;

            break;

          case 1:

                   case 2 :

            $ascii=mt_rand(97,122);

              break; ;//Ascii character decoding

}

//Generate verification code background color (randbg(): function call)

imagefilledrectangle($i,0,0,$width,$height,randbg($i));

//Generate random interference (randpix(): function Call)

for($j=0;$j<50;$j )

{

imagesetpixel($i, mt_rand(0,$width),mt_rand(0,$height) ,randpix($i));

}

//Writing

for($j=0;$j<$num;$j )

{

$x=floor($width/$num)*$j 2;

$y=mt_rand(3,$height-15);

imagechar($i,5,$x,$y,$string[$j], randpix($i));

}

//Picture format

## $fuc ='image'.$type;

$have='cotent-type:image'.$type;

if(function_exists($fuc))

{

header($have);

$fuc($i);

}

else

{

echo 'Image type not supported';

}

imagedestroy($i);

return $string;

}

#//Background color function module

function randbg($i)

{

return imagecolorallocate($i,mt_rand(135,255), mt_rand(135,255),mt_rand(135,255));

       

  }

//Interference element or character color function module

function randpix($i)

{

return imagecolorallocate($i,mt_rand(0,135),mt_rand (0,135),mt_rand(0,135));

}

?>

##

Answer 1

这是个验证码类，你可以参考一下
<?php

class Captcha
{
    private $width;
    private $height;
    private $codeNum;
    private $code;
    private $im;

    function __construct($width=80, $height=20, $codeNum=4)
    {
        $this->width = $width;
        $this->height = $height;
        $this->codeNum = $codeNum;
    }

    function showImg()
    {
        //创建图片
        $this->createImg();
        //设置干扰元素
        $this->setDisturb();
        //设置验证码
        $this->setCaptcha();
        //输出图片
        $this->outputImg();
    }

    function getCaptcha()
    {
        return $this->code;
    }

    private function createImg()
    {
        $this->im = imagecreatetruecolor($this->width, $this->height);
        $bgColor = imagecolorallocate($this->im, 0, 0, 0);
        imagefill($this->im, 0, 0, $bgColor);
    }

    private function setDisturb()
    {
        $area = ($this->width * $this->height) / 20;
        $disturbNum = ($area > 250) ? 250 : $area;
        //加入点干扰
        for ($i = 0; $i < $disturbNum; $i++) {
            $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));
            imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
        }
        //加入弧线
        for ($i = 0; $i <= 5; $i++) {
            $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));
            imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);
        }
    }

    private function createCode()
    {
        $str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";

        for ($i = 0; $i < $this->codeNum; $i++) {
            $this->code .= $str{rand(0, strlen($str) - 1)};
        }
    }

    private function setCaptcha()
    {
        $this->createCode();

        for ($i = 0; $i < $this->codeNum; $i++) {
            $color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250));
            $size = rand(floor($this->height / 5), floor($this->height / 3));
            $x = floor($this->width / $this->codeNum) * $i + 5;
            $y = rand(0, $this->height - 20);
            imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);
        }
    }

    private function outputImg()
    {
        if (imagetypes() & IMG_JPG) {
            header('Content-type:image/jpeg');
            imagejpeg($this->im);
        } elseif (imagetypes() & IMG_GIF) {
            header('Content-type: image/gif');
            imagegif($this->im);
        } elseif (imagetype() & IMG_PNG) {
            header('Content-type: image/png');
            imagepng($this->im);
        } else {
            die("Don't support image type!");
        }
    }

}

// 这样调用 新建文件
<?php
require_once 'captcha.class.php';

$captcha = new Captcha(80,30,4);

$captcha->showImg();

Answer 2

Post the error message, who has time to read your code? ? ?