php 防SQL注入--初级方法

//防注入函数
function inject_check($sql_str){
    $check = eregi('select|insert|update|delete|\\*|\\/\\*|\\'|\\.\\.\\/|\\.\\/|UNION|into|load_file|outfile',$sql_str);
    if($check){        
       page_href("http://".$_SERVER['HTTP_HOST']."/home/sitemap.php");
       exit();     
    }else{
       return $sql_str;
    }
}
//防跨站攻击
function inject_check2($sql_str){
    $check = eregi('javascript|vbscript|expression|applet|meta|xml|blink|link|style|script|embed|object|iframe|frame|frameset|ilayer|layer|bgsound|title|base|onabort|onactivate|onafterprint|onafterupdate|onbeforeactivate|onbeforecopy|onbeforecut|onbeforedeactivate|onbeforeeditfocus|onbeforepaste|onbeforeprint|onbeforeunload|onbeforeupdate|onblur|onbounce|oncellchange|onchange|onclick|oncontextmenu|oncontrolselect|oncopy|oncut|ondataavailable|ondatasetchanged|ondatasetcomplete|ondblclick|ondeactivate|ondrag|ondragend|ondragenter|ondragleave|ondragover|ondragstart|ondrop|onerror|onerrorupdate|onfilterchange|onfinish|onfocus|onfocusin|onfocusout|onhelp|onkeydown|onkeypress|onkeyup|onlayoutcomplete|onload|onlosecapture|onmousedown|onmouseenter|onmouseleave|onmousemove|onmouseout|onmouseover|onmouseup|onmousewheel|onmove|onmoveend|onmovestart|onpaste|onpropertychange|onreadystatechange|onreset|onresize|onresizeend|onresizestart|onrowenter|onrowexit|onrowsdelete|onrowsinserted|onscroll|onselect|onselectionchange|onselectstart|onstart|onstop|onsubmit|onunload',$sql_str);
    if($check){        
       page_href("http://".$_SERVER['HTTP_HOST']."/home/sitemap.php");
       exit();     
    }else{
       //return $sql_str;
    }
}
//该片段来自于http://outofmemory.cn