本文实例为大家分享了PHP验证码类，利用对象来实现的验证码类，供大家参考，具体内容如下

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Class Image{

private $img;

public $width = 85;

public $height = 25;

public $code;

public $code_len = 4;

public $code_str = "329832983DSDSKDSLKQWEWQ2lkfDSFSDjfdsfdsjwlkfj93290KFDSKJFDSOIDSLK";

public $bg_color = '#DCDCDC';

public $font_size = 16;

public $font = 'font.ttf';

public $font_color = '#000000';

//创建验证码饿字符创

public function create_code(){

$code = '';

for( $i=0;$i<$this->code_len;$i++ ){

$code .= $this->code_str[mt_rand(0, strlen($this->code_str)-1)];

}

return $this->code = $code;

}

//输出图像

public function getImage(){

$w = $this->width;

$h = $this->height;

$bg_color = $this->bg_color;

$img = imagecreatetruecolor($w, $h);

$bg_color = imagecolorallocate($img,

hexdec(substr($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2)));

imagefill($img, 0, 0, $bg_color);

$this->img = $img;

$this->create_font();

$this->create_pix();

$this->show_code();

}

//写入验证码

public function create_font(){

$this->create_code();

$color = $this->font_color;

$font_color = imagecolorallocate($this->img, hexdec(substr($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2)));

$x = $this->width/$this->code_len;

for( $i=0;$i<$this->code_len;$i++ ){

$txt_color = imagecolorallocate($this->img, mt_rand(0,100), mt_rand(0, 150), mt_rand(0, 200));

imagettftext($this->img, $this->font_size, mt_rand(-30, 30), $x*$i+mt_rand(3, 6), mt_rand($this->height/1.2, $this->height), $txt_color, $this->font , $this->code[$i]);

//imagestring($this->img, $this->font_size, $x*$i+mt_rand(3, 6),mt_rand(0, $this->height/4) , $this->code[$i], $font_color);

}

$this->font_color = $font_color;

}

//画干扰线

public function create_pix(){

$pix_color= $this->font_color;

for($i=0;$i<100;$i++){

imagesetpixel($this->img, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color);

}

for($j=0;$j<4;$j++){

imagesetthickness($this->img, mt_rand(1, 2));

imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);

}

}

//得到验证码

public function getCode(){

return strtoupper($this->code);

}

//输出验证码

private function show_code(){

header("Content-type:image/png");

imagepng($this->img);

imagedestroy($this->img);

}

}

以上就是使用对象编写的验证码类的全部内容，希望对大家学习PHP程序设计有所帮助。