PHP实现适用于自定义的验证码类

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

rush:PHP;"> PHP

/*

• To change this license header,choose License Headers in Project Properties.
• To change this template file,choose Tools | Templates
• and open the template in the editor.
  */
  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($bg_color,1,2)),3,5,2)));
imagefill($img,$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,2)));
$x = $this->width/$this->code_len;
for( $i=0;$i<$this->code_len;$i++ ){
$txt_color = imagecolorallocate($this->img,mt_rand(0,100),150),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->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($this->img,$this->width),$pix_color);
}
for($j=0;$j<4;$j++){
imagesetthickness($this->img,mt_rand(1,2));
imageline($this->img,$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);
}
}

效果图：

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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。