79 lines
1.7 KiB
PHP
79 lines
1.7 KiB
PHP
<?php
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namespace verifycode;
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use think\Session;
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class Verify{
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private $charset;
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private $code;
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private $code_len; //默认4
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private $img;
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private $width; //默认80
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private $height; //默认32
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private $font; //字体路径
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private $font_size; //默认20
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private $font_color;
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function __construct()
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{
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$this->font='./static/simhei.ttf';
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$this->code_len=4;
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$this->width=80;
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$this->height=32;
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$this->font_size=20;
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$this->charset='ABCDEFGHIJKLMNOPQRSTUVWXYZ';
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}
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//生成随机码
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private function createCode()
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{
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$_len = strlen($this->charset)-1;
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for ($i=0;$i<$this->code_len;$i++)
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{
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$this->code .= $this->charset[mt_rand(0,$_len)];
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}
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}
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//生成背景
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private function createBg()
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{
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$this->img = imagecreatetruecolor($this->width, $this->height);
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$color = imagecolorallocate($this->img,238,238,238);
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imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
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}
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//生成字体
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private function createFont()
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{
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$_x = $this->width / $this->code_len;
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for ($i=0;$i<$this->code_len;$i++)
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{
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$this->font_color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imagettftext($this->img,$this->font_size,0,$_x*$i+5,$this->height / 1.2,$this->font_color,$this->font,$this->code[$i]);
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}
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}
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//输出
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private function outPut()
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{
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header('Content-type:image/png');
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imagepng($this->img);
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imagedestroy($this->img);
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}
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//对外生成
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public function doimg()
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{
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$this->createBg();
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$this->createCode();
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$this->createFont();
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Session::set("img_verify",md5($this->getCode()));
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$this->outPut();
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}
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//获取验证码
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public function getCode()
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{
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return strtolower($this->code);
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}
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}
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?>
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