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                            ```
abs() 絕對值

ceil() 進一法取整     

floor()  舍去法取整

fmod()  浮點數取余

pow()  返回數的N次方

round()  浮點數四舍五入

sqrt()  求平方根

max()   求最大值

min()    求最小值

mt_rand()   更好的隨機數

rand()      隨機數
     
pi()   獲取圓周率值

intval()獲取變量的整數值
```


驗證碼代碼：

~~~
function yanzheng($yanzheng=4){

    $ma='1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM';


    $machang=strlen($ma);  //字符串的長度

    for($i=0;$i<$yanzheng;$i++) {
      $yanzhengma=mt_rand(0,($machang-1)) ;

    echo  $ma[$yanzhengma];
    }


}

echo yanzheng(5);
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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