Php 如何将if（isset（$authUrl））分配给div内的图像

我成功地修改了使用Google plus API登录的代码，并且在localhost上运行良好

我试图将

$authUrl

（gplus login.php）值分配给另一个php文件“trackorder.php”图像（在div标记内）

Trackorder.php文件，我要将$authUrl值放在其中

    <div style="margin-left:50px;">
    <a href="">
      <img src="images/Google-button.png" style="width:200px; height:35px;"></a>
    </div>

gplus login.php

 <?php
 require_once 'src/apiClient.php';
 require_once 'src/contrib/apiPlusService.php';

 session_start();

 $client = new apiClient();
 $client->setApplicationName("My Project");
 $client->setScopes(array('https://www.googleapis.com/auth/plus.me'));
 $plus = new apiPlusService($client);

 if (isset($_REQUEST['logout'])) 
  {
  unset($_SESSION['access_token']);
  }

  if (isset($_GET['code'])) 
  {
  $client->authenticate();
  $_SESSION['access_token'] = $client->getAccessToken();
  header('Location: http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF']);
  }

  if (isset($_SESSION['access_token'])) 
  {
  $client->setAccessToken($_SESSION['access_token']);
  }

  if ($client->getAccessToken()) 
  {
  $me = $plus->people->get('me');
  $optParams = array('maxResults' => 100);
  $activities = $plus->activities->listActivities('me', 'public',$optParams);

  // The access token may have been updated lazily.
   $_SESSION['access_token'] = $client->getAccessToken();
  } 
  else 
  {
  $authUrl = $client->createAuthUrl(); 
  }
 ?>

 <div>
 <?php if(isset($me))
 {  
 $_SESSION['gplusdata']=$me;
 header("location: home.php");
 } 
 ?>

 <?php
 if(isset($authUrl)) 
 {
 print "<a class='login' href="$authUrl">Google Login</a>";
 } 
 else 
 {
  print "<a class='logout' href='trackorder.php?logout'>Logout</a>";
 }
 ?><br/>
 </div>

您可以包含Trackorder.php，并在包含之前设置动态变量

<?php
if(!isset($authUrl)) {
$authUrl = 'trackorder.php?logout';
$authLabel = 'Logout';
$authClass = 'logout';
} else {
$authLabel = 'Google Login';
$authClass = 'login';
}
include('Trackorder.php');
?>

对于Trackorder.php

<div style="margin-left:50px;">
    <a href="<?= $authUrl; ?>" class="<?= $authClass; ?>"><?= $authLabel; ?>
      <img src="images/Google-button.png" style="width:200px; height:35px;"></a>
</div>

不确定要对链接中的图像执行什么操作

如果您只希望Trackorder.php文件用于登录，只需将include移到else中，并恢复初始If子句以弹出注销链接