Question

我有以下查询：

$sth = $this->db->prepare("SELECT * FROM comment WHERE status = 1");
$sth->setFetchMode(PDO::FETCH_ASSOC);
$sth->execute();

$reviews = array();

while($row = $sth->fetch()){    
    $reviews[]['name'] = $row['name'];
    $reviews[]['comment'] = $row['comment'];
    $reviews[]['star'] = $row['star'];
}

return $reviews;
}

返回var_dump($this->reviews)的以下内容：

array(9) { 
[0]=> array(1) { ["name"]=> string(5) "name1" } 
[1]=> array(1) { ["comment"]=> string(8) "comment1" } 
[2]=> array(1) { ["star"]=> string(1) "4" } 
[3]=> array(1) { ["name"]=> string(5) "name2" } 
[4]=> array(1) { ["comment"]=> string(8) "comment2" } 
[5]=> array(1) { ["star"]=> string(1) "4" } 
[6]=> array(1) { ["name"]=> string(5) "name3" } 
[7]=> array(1) { ["comment"]=> string(8) "comment3" } 
[8]=> array(1) { ["star"]=> string(1) "4" } 
}

如何使用foreach按行显示name，comment，star？

即：

name1, email1@email.com, comment1
name2, email2@email.com, comment2
name3, email3@email.com, comment3

我知道它应该是这样的：

foreach( $this->reviews as $key){
  echo "Name:". $this->reviews['name'] . "Email:" . $this->reviews['email'] . "Comment:" .  $this->reviews['comment'];
}

但这给了我Notice: Undefined index: name。如何定义索引？

Answer 1

您需要生成一个数组数组。像

这样的东西

while($row = $sth->fetch()){    
    $reviews[] = array('name' => $row['name'], 'comment' => $row['comment'], 'star'=> $row['star']);
}

现在，您的$reviews对象的元素数量与查询结果中的行数一样多，您可以按照自己的方式打印它。

至于打印（我认为是您的错误消息来源）：

foreach($reviews as $thisValue) {
  echo "Name: ". $value['name'];
}

应该有用。

Answer 2

您正在错误地设置插入数组：

while($row = $sth->fetch()){    
    $reviews[]['name'] = $row['name'];
    $reviews[]['comment'] = $row['comment'];
    $reviews[]['star'] = $row['star'];
}

简写[]每次都插入一个新元素，你想要实际插入一个数组作为元素。

while($row = $sth->fetch()){    
    $revArr=array('name' => $row['name'], 'comment' => $row['comment'], 'star' => $row['star']);
    $reviews[]=$revArr;
}

编辑：现在将您的第二个foreach更改为：

foreach( $this->reviews as $key){
  echo "Name:". $key['name'] . "Email:" . $key['email'] . "Comment:" .  $key['comment'];
}

Answer 3

您应该像这样使用foreach循环：

foreach( $this->reviews as $value){
  echo "Name:". $value['name'] . "Email:" . $value['email'] . "Comment:" .  $value['comment'];
}

请注意我如何在循环中使用$value而不是$this->reviews。

Answer 4

foreach( $this->reviews as $key){
  echo "Name:". $this->reviews['name'] . "Email:" . $this->reviews['email'] . "Comment:" .  $this->reviews['comment'];
}

这不是正确的方法，因为现在你正在使用$ key所以写 -

   foreach( $this->reviews as $key){
      echo "Name:". $key['name'] . "Email:" . $key['email'] . "Comment:" .  $key['comment'];
    }

Answer 5

你可以这样做：

$reviews = array();
while($row = $sth->fetch()){    
   $reviews[] = array($row['name'], $row['comment'], $row['email'], $row['star']);
}

然后你可以做一个heredoc：

$str = '';
foreach( $this->reviews as $review ){
   $str .=<<<html
       name: {$review['name']}
       email: {$review['email']}
       comment: {$review['comment']}
       start: {$review['star']}
   html;
}

最后我回应了一切：

echo $str;

我认为这更清晰，你可以添加任何HTML。

如何使用foreach（）显示数组的结果

5 个答案: