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Question

如果我把echo "h";放在if語句中，我什麼也沒有返回。另外，如果我在SQL代碼中放置一個WHERE子句並使用該方法，那麼在foreach循環中我也不會返回任何內容。任何想法爲什麼發生這種情況？我只需要一個登錄的當前用戶相匹配的用戶。什麼腳本的做的是通過在用戶表

public function dcr() { 
    // pass all dashboard accesses through this function 
    $username = $this->session->userdata("username"); 
    $query = $this->db->query("SELECT * FROM users"); 
    foreach ($query->result() as $row) { 
        echo "h"; 
     if ($username == $row->username) { 
       $data = array('firstname' => $row->firstname); 
       $this->load->view('dashboard', $data); 
      } 
    } 
} 

Answer 1

這應該做的伎倆（沒有測試）的所有行循環，你不需要if語句，只需使用函數get_where，因爲代碼將變得更清晰和可讀。

public function dcr() { 
    // pass all dashboard accesses through this function 
    $username = $this->session->userdata("username"); 
    $query = $this->db->get_where('users', array('username' => $username)); 
    foreach ($query->result() as $row) { 
     $data = array('firstname' => $row->firstname); 
     $this->load->view('dashboard', $data); 
    } 
}