Question

我的问题是我无法从数据库中将数据插入到数组中，然后使用in_array函数回显出特定的字符串或文本。我究竟做错了什么？
这是我尝试过的代码。

<?php
try {
    $conn = new PDO('mysql:host=localhost; dbname=driving','root','');
    $sel = "SELECT first_name, civ_licenses FROM users";
    $stmt = $conn->prepare($sel);
    $stmt->execute();
    while($row = $stmt->fetch()) {
        $arrayResult = $row['civ_licenses'];
        $civArray = array($arrayResult);
        if(in_array('`license_civ_driving`,1', $civArray)){
            echo $row['first_name'], 'has got the driving license';
        }
    }
    die;
} catch (PDOException $e) {
  echo "There was an error with your code!" . $e->getMessage();
  exit;
}

 ?>

Answer 1

这就是我要做的事情

$sel = "SELECT first_name, civ_licenses FROM users";
$stmt = $conn->prepare($sel);
$stmt->execute();
$data = $stmt->fetchAll(PDO::FETCH_GROUP);

它会给你这样的东西

 [
     'bob' => [
           ['civ_licenses1'],
           ['civ_licenses2'],
     ], 'alice' => [
       ....
     ]
 ]

它将它们分组在第一列，在本例中为first_name。这与在SQL中使用GROUP BY不同。

然后你可以循环它们

foreach($data as $first_name => $civ_array){
   ...
}

因此，在第一次迭代之上使用我的数据会给你这个

$first_name = 'bob'
$civ_array = [
       ['civ_licenses1'],
       ['civ_licenses2'],
 ];

Answer 2

如果我理解正确，你的代码应该是这样的：

<?php
try {
    $conn = new PDO('mysql:host=localhost; dbname=driving','root','');
    $sel = "SELECT first_name, civ_licenses FROM users";
    $stmt = $conn->prepare($sel);
    $stmt->execute();
    $civArray = array();
    while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {

        $civArray[] = $row['civ_licenses'];
        if(in_array('`license_civ_driving`,1', $civArray)){
            echo $row['first_name'], 'has got the driving license';
        }

    }
    die;
} catch (PDOException $e) {
  echo "There was an error with your code!" . $e->getMessage();
  exit;
}

首先需要声明空数组

$ civArray = array（）;
您可以使用fetch_style，如PDO :: FETCH_ASSOC http://php.net/manual/en/pdostatement.fetch.php

$ stmt-＆GT;取（PDO :: FETCH_ASSOC）
在每次迭代中向数组
添加值
$ civArray [] = $ row [＆＃39; civ_licenses＆＃39;];

并检查此数组中的许可证值

if(in_array('`license_civ_driving`,1', $civArray)){
    echo $row['first_name'], 'has got the driving license';
}

（PDO）将数据库数据插入数组并使用in_array来回显数据

2 个答案: