Question

如果entry_type是页面的entry_type或post，此代码将根据我在pagina列上有多少数据来复制元标记我在。而且它正在从meta和if上打印else标签。

$mt = $conn->query("SELECT entry_type FROM bn_publicacao")->fetchAll();

foreach ($mt as $FB) {

    if ($FB['entry_type'] == 'pagina'){ 
        echo '<meta property="og:type" content="website">';
    } else{
        echo '<meta property="og:type" content="article">';
        echo '<meta property="article:author" content="">';
        echo '<meta property="article:publisher" content="">';
        echo '<meta property="article:published_time" content="">';
        echo '<meta property="article:modified_time" content="">';
    }

 }

编辑：我解决了重复项的问题

$mt = $conn->query("SELECT entry_type FROM bn_publicacao WHERE entry_type IS NOT NULL GROUP BY entry_type")->fetchAll();

foreach ($mt as $FB) {

    if ($FB['entry_type'] == 'pagina'){ 
        echo '<meta property="og:type" content="website">';
    } else{
        echo '<meta property="og:type" content="article">';
        echo '<meta property="article:author" content="">';
        echo '<meta property="article:publisher" content="">';
        echo '<meta property="article:published_time" content="">';
        echo '<meta property="article:modified_time" content="">';
    }

 }

但是我仍然遇到if和else同时打印的问题。

print_r的结果：

$mt = $conn->query("SELECT entry_type FROM bn_publicacao WHERE entry_type IS NOT NULL GROUP BY entry_type")->fetchAll();

foreach ($mt as $FB) {
print_r($mt); //Result 1

    if ($FB['entry_type'] == 'pagina'){
    print_r($mt); //Result 2

        //code posted on the question

    } else{    
      print_r($mt); //Result 3

        //code posted on the question

    }

}

结果1：

Array（[0] => Array（[entry_type] => pagina [0] => pagina）[1] => Array（[entry_type] => post [0] => post））Array（[0 ] =>数组（[entry_type] => pagina [0] => pagina）[1] =>数组（[entry_type] => post [0] => post））

结果2：

Array（[0] => Array（[entry_type] => pagina [0] => pagina）[1] => Array（[entry_type] => post [0] => post））

结果3：

Array（[0] => Array（[entry_type] => pagina [0] => pagina）[1] => Array（[entry_type] => post [0] => post））

我的代码有什么问题？而我该如何解决呢？

Answer 1

fetchColumn仅返回一个结果，fetchColumn。您可以使用fetchAll将所有结果作为数组返回。

您需要遍历结果，因为它将是一个数组。下面的代码：

$mtFBs = $conn->query("SELECT entry_type FROM bn_publicacao")->fetchAll();
foreach ($mtFbs as $mtFb) {
   if ($mtFB['entry_type'] == 'pagina'){ 
     echo '<meta property="og:type" content="website">';
   } else{
      echo '<meta property="og:type" content="article">';
      echo '<meta property="article:author" content="">';
      echo '<meta property="article:publisher" content="">';
      echo '<meta property="article:published_time" content="">';
      echo '<meta property="article:modified_time" content="">';
   }
 }

我的if语句未按预期运行

1 个答案: