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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<?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($bg_color, 1,2)), hexdec(substr($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);
}
}
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效果图：
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。