php – 不能在函数调用的结果上使用isset()(你可以使用“null！= Func()”代替)

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( ! ) Fatal error: Cannot use isset() on the result of a function call (you can use "null !== func()" instead) in C:\Users\sanoj\Documents\NetBeansProjects\video-site\app\detect.PHP on line 45
Call Stack
#   Time    Memory  Function    Location
1   0.0000  234208  {main}( )   ..\index.PHP:0

以前我的代码是

if(!defined('WAP'))
    define('WAP',isset($_REQUEST['wap']) || isset($_REQUEST['wap2']) || isset($_REQUEST['imode'])|| isset($_REQUEST['html'])|| isset($_REQUEST['Android'])|| isset($_REQUEST['iphone'])|| isset($_REQUEST['IEMobile']));

    if (WAP)
{
    define('WIRELESS_PROTOCOL',isset($_REQUEST['wap']) ? 'wap' : (isset($_REQUEST['wap2']) ? 'wap2' : (isset($_REQUEST['iphone']) ? 'iphone' : (isset($_REQUEST['imode']) ? 'imode' : (isset($_REQUEST['IEMobile']) ? 'IEMobile' :(isset($_REQUEST['html']) ? 'html' : (isset($_REQUEST['Android']) ? 'Android' : '')))))));

我的IDE警告不要直接访问SuperGlobal $_REQUEST数组
所以我使用了以下代码

if(!defined('WAP'))
{
    define('WAP',isset(filter_input(INPUT_REQUEST,'wap',FILTER_SANITIZE_STRING)) || isset(filter_input(INPUT_REQUEST,'wap2','imode',FILTER_SANITIZE_STRING))|| isset(filter_input(INPUT_REQUEST,'html','Android','iphone','IEMobile',FILTER_SANITIZE_STRING)));
}
    if (WAP)
{
    define('WIRELESS_PROTOCOL',FILTER_SANITIZE_STRING)) ? 'wap' : (isset(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'wap2' : (isset(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'iphone' : (isset(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'imode' : (isset(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'IEMobile' :(isset(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'html' : (isset(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'Android' : '')))))));

这是detect.PHP

<?PHP
$userBrowser = $_SERVER['HTTP_ACCEPT']; 
if(stristr($userBrowser,'application/vnd.wap.xhtml+xml')) 
{
$_REQUEST['wap2'] = 1;
}

elseif(stripos($_SERVER['HTTP_USER_AGENT'],"iPod"))
{
$_REQUEST['iphone'] = 1;

}
elseif(stripos($_SERVER['HTTP_USER_AGENT'],"iPhone"))
{
$_REQUEST['iphone'] = 1;

}
elseif(stripos($_SERVER['HTTP_USER_AGENT'],"Android"))
{
$_REQUEST['Android'] = 1;

}
elseif(stripos($_SERVER['HTTP_USER_AGENT'],"IEMobile"))
{
$_REQUEST['IEMobile'] = 1;

}
elseif(stristr($userBrowser,'DoCoMo/' || 'portalmmm/'))
{
$_REQUEST['imode'] = 1;
}

elseif(stristr($userBrowser,'text/vnd.wap.wml')) 
{
$_REQUEST['wap'] = 1;
}
elseif(stristr($userBrowser,'text/html')) 
{
$_REQUEST['html'] = 1;
}


if(!defined('WAP'))
    define('WAP',isset($_REQUEST['wap']) ? 'wap' : (isset($_REQUEST['wap2']) ? 'wap2' : (isset($_REQUEST['iphone']) ? 'iphone' : (isset($_REQUEST['imode']) ? 'imode' : (isset($_REQUEST['IEMobile']) ? 'IEMobile' :(isset($_REQUEST['html']) ? 'html' : (isset($_REQUEST['Android']) ? 'Android' : '')))))));  

if (WIRELESS_PROTOCOL == 'wap')
      {
$browser_t = "mobile";
      }
elseif (WIRELESS_PROTOCOL == 'wap2')
      {


$browser_t = "mobile";


      }
elseif (WIRELESS_PROTOCOL == 'imode')
      {

$browser_t = "mobile";

      }
      elseif (WIRELESS_PROTOCOL == 'iphone')
      {


$browser_t = "smartphone";

      }
      elseif (WIRELESS_PROTOCOL == 'Android')
      {


$browser_t = "smartphone";

      }
       elseif (WIRELESS_PROTOCOL == 'IEMobile')
      {

$browser_t = "smartphone";

      }
      elseif (WIRELESS_PROTOCOL == 'html')
      {

     $mobile_browser = '0';

if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone)/i',strtolower($_SERVER['HTTP_USER_AGENT']))){
    $mobile_browser++;
    }

if((strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml')>0) or 
    ((isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE'])))){
    $mobile_browser++;
    }

$mobile_ua = strtolower(substr($_SERVER['HTTP_USER_AGENT'],4));
$mobile_agents = array(
    'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac','blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno','ipaq','java','jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-','maui','maxo','midp','mits','mmef','mobi','mot-','moto','mwbp','nec-','newt','noki','oper','palm','pana','pant','phil','play','port','prox','qwap','sage','sams','sany','sch-','sec-','send','seri','sgh-','shar','sie-','siem','smal','smar','sony','sph-','symb','t-mo','teli','tim-','tosh','tsm-','upg1','upsi','vk-v','voda','wap-','wapa','wapi','wapp','wapr','webc','winw','xda','xda-');

if(in_array($mobile_ua,$mobile_agents)){
    $mobile_browser++;
    }
if (strpos(strtolower($_SERVER['ALL_HTTP']),'OperaMini')>0) {
    $mobile_browser++;
    }
        if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'iemobile')>0) {
$mobile_browser++;
}
if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows')>0) {
    $mobile_browser=0;
    }


if($mobile_browser>0){
   // do something wap

$browser_t = "mobile";

}
// non-mobile
else
{

$_SESSION['Browser_d'] = "web";
$browser_t = "web";

}
   } else {
   // do something else html

$_SESSION['Browser_d'] = "web";
$browser_t = "web";
   }

      }


    else
    {
$mobile_browser = '0';

if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone)/i',$mobile_agents)){
    $mobile_browser++;
    }
    if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'iemobile')>0) {
$mobile_browser++;
}
if (strpos(strtolower($_SERVER['ALL_HTTP']),'OperaMini')>0) {
    $mobile_browser++;
    }
if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows')>0) {
    $mobile_browser=0;
    }


if($mobile_browser>0){
   // do something wap

$browser_t = "mobile";

}
// non-mobile
else
{
$_SESSION['Browser_d'] = "web";
$browser_t = "web";
}

    }
     ?>

和index.PHP

<?PHP 
include "app/config.PHP";
include "app/detect.PHP";

if ($page_name=='') {
    include $browser_t.'/index.html';
    }
elseif ($page_name=='index.html') {
    include $browser_t.'/index.html';
    }
elseif ($page_name=='singlepage.html') {
    include $browser_t.'/singlepage.html';
    }
elseif ($page_name=='categories.html') {
    include $browser_t.'/categories.html';
    }
elseif ($page_name=='contact.html') {
    include $browser_t.'/contact.html';
    }
else
    {
        include $browser_t.'/404.html';
    }

?>

和config.PHP

<?PHP
$current_page_uri = $_SERVER['REQUEST_URI'];
$part_url = explode("/",$current_page_uri);
$page_name = end($part_url);
$email_id = "s.hidayath@agileits.com";
?>

当加载索引文件时,它应检测设备并将其重定向到正确的根,但在我的情况下它不会
我得到以下错误

( ! ) Notice: Undefined index: ALL_HTTP in C:\Users\sanoj\Documents\NetBeansProjects\video-site-2\app\detect.PHP on line 118
Call Stack
#   Time    Memory  Function    Location
1   0.0090  233992  {main}( )   ..\index.PHP:0
2   0.0230  295896  include( 'C:\Users\sanoj\Documents\NetBeansProjects\video-site-2\app\detect.PHP' )  ..\index.PHP:11

( ! ) Warning: include(web/404.html): Failed to open stream: No such file or directory in C:\Users\sanoj\Documents\NetBeansProjects\video-site-2\index.PHP on line 30
Call Stack
#   Time    Memory  Function    Location
1   0.0090  233992  {main}( )   ..\index.PHP:0

( ! ) Warning: include(): Failed opening 'web/404.html' for inclusion (include_path='.;C:\PHP\pear') in C:\Users\sanoj\Documents\NetBeansProjects\video-site-2\index.PHP on line 30
Call Stack
#   Time    Memory  Function    Location
1   0.0090  233992  {main}( )   ..\index.PHP:0
首先,NetBeans IDE会向您显示这些警告,以便您不直接信任$_REQUEST值并以某种方式验证它.通过检查isset($_ REQUEST [‘wap’]),您已经在检查IDE建议的哪个部分.此过程可以有其他步骤,您应该在使用它之前执行此操作,例如插入数据库.我忽略了许多NetBeans警告,因为NetBeans不知道我将如何处理输入/变量.它只是警告我最佳实践,这可能是也可能不是我的最佳实践.并且警告应该仅作为建议,而不是您必须做的事情.

其次,如果使用filter_input(),则不需要另外使用isset().因为,filter_input()已经为你做了.正如文件所说,

Return Values : Value of the requested variable on success,FALSE if the filter fails,or NULL if the variable_name variable is not set. If the flag FILTER_NULL_ON_FAILURE is used,it returns FALSE if the variable is not set and NULL if the filter fails.

所以你可以删除isset(),你的代码应该安全地工作.但您可能仍想检查该值是否设置为应用替代值.在这种情况下,只需使用empty()函数,当filter_input()返回的值为NULL / FALSE时,它将返回FALSE.所以只是否定符合条件的条件.像这样 – 

if(!defined('WAP'))
{
    define('WAP',!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) || !empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING))|| !empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)));
}

 if (WAP)
{
    define('WIRELESS_PROTOCOL',FILTER_SANITIZE_STRING)) ? 'wap' : (!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'wap2' : (!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'iphone' : (!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'imode' : (!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'IEMobile' :(!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'html' : (!empty(filter_input(INPUT_REQUEST,FILTER_SANITIZE_STRING)) ? 'Android' : '')))))));
}

第二个错误

Notice: Undefined index: ALL_HTTP

我在$_SERVER的PHP文档中找不到任何名为ALL_HTTP的变量.所以请检查链接并找到一个可以满足您目的的变量.我不确定你到底想要用它做什么,所以我无法提出任何建议.

第三个错误

Warning: include(web/404.html): Failed to open stream.

错误已经说明该文件不存在.因此,文件不存在或者您提供的路径不正确.请检查并修复它.

原文链接：https://www.f2er.com/php/137416.html

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