php 检查用户是否已经存在于drupal中
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Checking whether a user already exists in drupal
提问by simonr
When a user enters his login information and hits submit, i want to check if the user already exists or not. So, i have the following two questions 1. Which hook is needed to be implemented , for the case when user hits the submit button on the login form. I need the username entered by the user. 2. How to check if a user already exists in drupal or not programmatically ?
当用户输入他的登录信息并点击提交时，我想检查用户是否已经存在。所以，我有以下两个问题 1. 需要实现哪个钩子，对于用户点击登录表单上的提交按钮的情况。我需要用户输入的用户名。2.如何以编程方式检查用户是否已存在于drupal中？
Some sample code would be really appreciated. Please help.
一些示例代码将不胜感激。请帮忙。
Thank You.
谢谢你。
回答by Mika Andrianarijaona
Drupal 7 provides a function to get a user object by name :
Drupal 7 提供了一个通过名称获取用户对象的函数：
$user = user_load_by_name($name);
if(!$user){
// User doesn't exist
}
else {
// User exists
}
http://api.drupal.org/api/drupal/modules%21user%21user.module/function/user_load_by_name/7
http://api.drupal.org/api/drupal/modules%21user%21user.module/function/user_load_by_name/7
回答by googletorp
This can be done with hook_form_alter:
这可以通过以下方式完成hook_form_alter：
function module_(&$form, &$form_state, $form_id) {
$user_login_forms = array('user_login', 'user_login_block');
if (in_array($form_id, $user_login_forms)) {
$form['#validate'][] = 'my_validate_function';
}
}
function my_validate_function(&$form, &$form_state) {
$name = $form_state['values']['name'];
// Drupal 6:
if (!db_result(db_query("SELECT COUNT(*) FROM {users} WHERE name = '%s';", $name))) {
// User doesn't exist
}
// Drupal 7:
if (!db_query("SELECT COUNT(*) FROM {users} WHERE name = :name;", array(':name' => $name))->fetchField()) {
// User doesn't exist
}
}
It's better to query the DB directly in this case than than using user_loadas it hooks into other modules as well.
在这种情况下直接查询数据库比使用它更好，user_load因为它也挂钩到其他模块。
回答by Arla
In Drupal 7, substitute for this in the validation function:
在 Drupal 7 中，在验证函数中替换它：
if (!db_query("SELECT COUNT(*) FROM {users} WHERE name = :name", array(':name' => $name))->fetchField()) {
// User doesn't exist
}
回答by Jasom Dotnet
You can try to look on these 2 modules for inspiration: friendly_registerand username_check.
您可以尝试查看以下 2 个模块以获取灵感：friendly_register和username_check。
回答by dawoodman71
I realize this is almost 2 years old, but user_authenticate does this nicely.
我意识到这已经快 2 年了，但是 user_authenticate 做得很好。
$existing_user = user_authenticate($name,$password);
if($existing_user)
// user exists
else
// user doesn't exist
Hope this helps someone else.
希望这对其他人有帮助。
