使用PHP将可变数量的字段添加到数据库表

function generateSQLStatement($_POST) {

    $fieldNames = "";
    $values = "";

    foreach ($_POST as $field => $value) {
        if (!empty($value)) {
            if (!empty($fieldNames)) {
                $fieldNames .= ',';
                $values .= ',';
            }
            $fieldNames .= SANITIZE_ME($field);
            $values .= "'" . SANITIZE_ME($value) . "'";

        }
    }

    return "($fieldNames) VALUES ($values)";
}

这种方法只使用一个循环,因此速度更快.但是,您可能希望根据预定义的可接受字段数组验证字段名称,以防有人编辑发布到您脚本的表单并放入无效的字段名称.

编辑

可以使用更通用的方法来创建一个实用程序函数,您可以在整个应用程序中轻松地重用其他表：

这个批次可以进入一些通用的包含文件：

// An array whose keys are valid table names and
// whose values are arrays of valid field names
// within the table named in the key
$acceptableFields = array(
    'contacts' => array(
        // valid fields in the 'contacts' table
        'name','address' //...
    )
    // ... other mappings,if desired
);

function isValidField($table,$field) {
    if (!isset($acceptableFields[$table]))
        return false;

    return in_array($field,$acceptableFields[$table]); 
    // Note that in_array is case-sensitive,so you may want 
    // to just manually loop through $acceptableFields[$table]
    // and compare strings yourself.
}

function insertData($table,array $fieldValuesMap,mysqli $mysqli) {
    // First,some self-explanatory validation:
    if ($table === null)
        throw new InvalidArgumentException('$table cannot be null');

    if (!is_string($table))
        throw new InvalidArgumentException('$table must be a String');

    if (empty($table))
        throw new InvalidArgumentException('$table cannot be an empty String');

    if (!isset($acceptableFields[$table]))
        throw new InvalidArgumentException(""$table" is an invalid table name");

    $fieldNames = "";
    $values = "";

    foreach ($fieldValuesMap as $field => $value) {
        // check the field name is valid for the given table
        // and that the value is not empty.  You may want to
        // add a logging mechanism for invalid field names to
        // help track bugs or even malicious use
        if (isValidField($table,$field) && !empty($value)) {
            // check to see whether there are any items in 
            // the lists already
            if (!empty($fieldNames)) {
                // yes,so add commas:
                $fieldNames .= ',';
            }

            // no need to escape the field name as we have already
            // checked that it is valid
            $fieldNames .= $field;
            // but we do need to escape the value
            $values .= "'" . $mysqli->real_escape_string($value) . "'";

        }
    }

    // check whether we've actually got anything to insert:
    if (empty($fieldNames))
        return NULL;

    return $mysqli->query("INSERT INTO $table ($fieldNames) VALUES ($values)");
}

用于添加联系人的页面上的示例用法：

require_once "above.file"; // whatever it's called

if ($_POST) {

    $mysqli = new MySQLi(/*...*/);
    if (mysqli_connect_errno()) {
        // handle connection error
    } else {
        // set your charset
        $mysqli->set_charset("utf8"); // or whatever you use

        $result = insertData('contacts',$_POST,$mysqli);

        if ($result === NULL) {
            // There was nothing to insert
        } elseif ($result === FALSE) {
            // An error occurred,handle it here
        } else {
            // Success!  Use $mysqli->insert_id to get your new 
            // record's ID (if appropriate).
        }
    }

}
//
//==============================================

一点额外的工作,你最终得到灵活和可重复使用的东西.但就个人而言,我更喜欢更面向对象(主动记录)的方法.