动态绑定参数 php/mysqli

Question

嗨，我在合并数组和绑定参数时遇到了一些问题。

错误消息 = 警告：mysqli_stmt：：bind_param（）：元素数 IN 类型定义字符串与绑定变量的数量不匹配 在。。。。。。。

    $headline = $_GET['hl'];
    $county = $_GET['ca'];
    $categories = $_GET['co'];
    $query = 'SELECT COUNT(id) FROM main_table';        
    $queryCond = array(); 
    $stringtype = array();
    $variable = array();

if (!empty($headline)) {
    $queryCond[] = "headline LIKE CONCAT ('%', ? , '%')";
   array_push($stringtype, 's');
   array_push($variable, $headline);
}
if (!empty($county)) {
    $queryCond[] = "county_id = ?";
    array_push($stringtype, 'i');
    array_push($variable, $county);
}
 if (!empty($categories)) {
    $queryCond[] = "categories_id = ?";
    array_push($stringtype, 'i');
    array_push($variable, $categories);
}
if (count($queryCond)) {
    $query .= ' WHERE  ' . implode(' AND ', $queryCond);
}

//var_dump($query);
$stmt = $mysqli->prepare($query);
$variable = array_merge($stringtype, $variable);
print_r($variable);

//var_dump($refs);
    $refs = array();
foreach($variable as $key => $value)

    $refs[$key] = &$variable[$key];

    call_user_func_array(array($stmt, 'bind_param'), $refs);

Answer 1

你需要改变这个：

$variable = array_merge($stringtype, $variable);
$refs = array();
foreach($variable as $key => $value)
    $refs[$key] = &$variable[$key];

对此：

$variable = array_combine($stringtype, $variable);

因为array_combine()通过使用一个数组作为键，另一个数组作为其值来创建数组。

阅读更多：

http://php.net/manual/en/function.array-combine.php

Answer 2

回答有点

晚了，但我在动态添加值时遇到了问题。如果你有 php v +5.6，你可以省略这部分

$variable = array_merge($stringtype, $variable);
// and $refs
call_user_func_array(array($stmt, 'bind_param'), $refs);

并使用...在 +5.6V 中引入的令牌。这是我的情况的完整工作示例：

// establish mysqli connection
$conn = new mysqli(.....); 
$tableName = 'users';
// Types to bind
$type = 'isss';
$fields = ['id','name', 'email', 'created'];
$values = [1, 'name', '[e-mail]', '2018-1-12'];
$sql = "INSERT INTO " . $tableName . " (" . join(',', $fields) . ") VALUES (?,?,?,?)";
$stmt = $conn->prepare($sql);
// Using ...token introduced in php v.5.6 instead of call_user_func_array
// This way references can be omitted, like for each value in array
$stmt->bind_param($type, ...$values);
$stmt->execute();
$stmt->close();