thinkphp生成验证码

TP框架自带的验证码类，位置：Think/verify.class.php

tp可用字体：

TP中生成验证码的函数：

public function verifyImg(){    $config = array(        'imageW' => 120,        'imageH' => 30,        'fontSize' => 15,        'length' => 4,        'fontttf' => '4.ttf'    );    $obj = new Verify($config);    $obj->entry();}