无需输入密码的WordPress登录表单

实现不需要输入密码，仅输入用户名或电子邮件即可登录的表单
```php
<form autocomplete="off" method="post">
	<div class="form-group">
		<input id="userlog" name="userlog" type="text" placeholder="<?php echo esc_attr__('Username/email', 'theme-domain'); ?>" class="form-control" required="required">
	</div>
	<input type="hidden" name="action" value="my_login_action" />
	<button type="submit"><?php echo esc_html__('Login', 'theme-domain'); ?></button>  
</form>
```
functions.php:
```php
add_action('init', function(){
	// Return if not the login request
	if( !isset( $_POST['action'] ) || $_POST['action'] !== 'my_login_action' )
		return;
	$result;
	$username = $_POST['userlog'];
	if ( ! $result ) {
		$result = get_user_by( 'email', $username ); // user email
	}
	if ( ! $result ) {
		$result = get_user_by('login', $username ); // user name
	}
 
	if ( !is_wp_error($result) ){
		wp_clear_auth_cookie();
		wp_set_current_user($result->ID);
		wp_set_auth_cookie($result->ID);
		wp_redirect( home_url( '/' ) );
		exit;
	}
	die();
});
```

本文链接： https://blog.miomoe.cn/WordPress/wordpress-login-form-without-password.html