php验证码类使用笔记(生成器,含代码)

问题:php生成验证码,只有一个小黑方块。

问题定位过程中,又发现几个问题,做笔记留用。

imagecreatetruecolor 函数找不到

报错/告警 关键信息:

imagecreatetruecolor(): Could not find

解决方法:
安装php的gd库

yum install php-gd

缺少字体文件

报错/告警 关键信息:

Warning: imagettftext(): Could not find/open font in /.../vcode.php on line 46

原因:缺少字体文件,验证码生成需要指定字体格式
解决方法:代码中指定的字体指定可访问的路径即可。

源码来源

https://www.jb51.net/article/102299.htm

代码

<?php
namespace utils;

class vcode {
    public function __construct() {
        $this->font = 'font/simhei.ttf';
    }

    static function create(){  
        static $instance ;  
        if (!$instance){  
            $instance = new VCode();  
        }  
        return $instance;  
    }

    private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
    private $code;//验证码
    private $codelen = 4;//验证码长度
    private $width = 130;//宽度
    private $height = 50;//高度
    private $img;//图形资源句柄
    private $font;//指定的字体
    private $fontsize = 20;//指定字体大小
    private $fontcolor;//指定字体颜色

    //生成随机码
    private function createCode() {
        $_len = strlen($this->charset)-1;
        for ($i=0;$i<$this->codelen;$i++) {
            $this->code .= $this->charset[mt_rand(0,$_len)];
        }
    }
    //生成背景
    private function createBg() {
        $this->img = imagecreatetruecolor($this->width, $this->height);
        $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
        imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
    }
    //生成文字
    private function createFont() {
        $_x = $this->width / $this->codelen;
        //$this->code = array("天", "地", "人", "和", "梦",);//随机因子
        for ($i=0;$i<$this->codelen;$i++) {
            $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
            imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
        }
    }
    //生成线条、雪花
    private function createLine() {
     //线条
        for ($i=0;$i<6;$i++) {
            $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
            imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
        }
        //雪花
        for ($i=0;$i<100;$i++) {
            $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
            imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
        }
    }
    //输出
    private function outPut() {
        header('Content-type:image/png');
        imagepng($this->img);
        imagedestroy($this->img);
    }
    //对外生成
    public function vCodePicture() {
        $this->createBg();
        $this->createCode();
        $this->createLine();
        $this->createFont();
        $this->outPut();
    }
    //获取验证码
    public function getCode() {
        return strtolower($this->code);
    }

    public function build() 
    {
        $this->vCodePicture();  
        $_SESSION['vcode'] = $this->code;
    }
}

?>
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