在通读源码学习中，请问rockclass中，iconvsql函数是起什么作用？

代码如下：

public function iconvsql($str,$lx=0)

{

$str = str_ireplace($this->lvlaraa,$this->lvlarab,$str);

$str = str_replace("

",'', $str);

if($lx==1)$str = str_replace(array(' ',' ',' '),array('','',''),$str);

return $str;

}

其中，

$this->lvlaraa = explode(',','select,alter,delete,drop,update,,,insert,from,time_so_sec,convert,from_unixtime,unix_timestamp,curtime,time_format,,concat,information_schema,group_concat,length,,,database,system_user,current_user,),found_rows,declare,master,exec,(),from,');

$this->lvlarab = array();

foreach($this->lvlaraa as $_i)$this->lvlarab[]='';

[img,{fileurl}/img/11899.png,700]

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