PHP類返回回聲但不是布爾

我的班級：

if(!class_exists('my_connections')) { 
    class my_connections { 

     /* --------------- CHECKS IF CONNECTION EXISTS */ 
     public function is_connection($member_id, $connection_id) { 

     global $db; 

     $sql = "SELECT * FROM `my_connections` WHERE `member_id` = '".$member_id."' AND `connection_id` = '".$connection_id."'"; 
     $result = @mysql_query($sql,$db); check_sql(mysql_error(), $sql, 0); 

     //echo '<pre>'. $sql .'</pre>'; 

     if(mysql_num_rows($result) > 0) { 

      echo "YES THEY ARE FRIENDS"; 
      //$return = true; 

     } else { 

      echo "NO THEY ARE NOT FRIENDS"; 
      //$return = false; 
     } 

     //return $return; 

     //echo $return; 
     } // EO method - is_connection 


    } // EO class 

} //EO if !class_exists

實例化在這裏：

$mc = new my_connections; 

$test = $mc->is_connection('2154', '139'); 

echo $test;

它返回的回聲聲明只是罰款，但沒有返回布爾，

爲如：不是

echo $test;

我想在其上運行的方法進行檢查：

像這樣：

if ($test) { 
    //do something 
}

在方法內部回聲語句將回歸真正的替代/假

來源

2014-01-10 Angad Dubey

作爲參考，有沒有這樣的事情「返回」的'echo'語句（只是返回一個閉包或函數名稱來完成輸出）。 – cHao

你有回聲：「他們是朋友」;在函數中。我應該是$ return = true;這在代碼 –

@cHao指出。謝謝。 –

試試這個：

if(!class_exists('my_connections')) { 
    class my_connections { 

     public function is_connection($member_id, $connection_id) { 

     global $db;  
     $sql = "SELECT * FROM `my_connections` WHERE `member_id` = '".$member_id."' AND `connection_id` = '".$connection_id."'"; 
     $result = @mysql_query($sql,$db); check_sql(mysql_error(), $sql, 0); 

     return mysql_num_rows($result) > 0 ; 
    }  
}

，檢查後：

if(is_connection($member_id, $connection_id)){ 
// do something 
}

來源

2014-01-10 17:52:02 sergio

工作謝謝你。 –

這個三元沒有任何用處：'return mysql_num_rows（$ result）> 0？ true：false;'。它和'return mysql_num_rows（$ result）> 0;' – MrLore

???完全一樣。不，測試簡單的例子回聲4> 2？真假; – sergio

修改代碼如下

if(!class_exists('my_connections')) { 
    class my_connections { 

     /* --------------- CHECKS IF CONNECTION EXISTS */ 
     public function is_connection($member_id, $connection_id) { 

     global $db; 

     $sql = "SELECT * FROM `my_connections` WHERE `member_id` = '".$member_id."' AND `connection_id` = '".$connection_id."'"; 
     $result = @mysql_query($sql,$db); check_sql(mysql_error(), $sql, 0); 

     //echo '<pre>'. $sql .'</pre>'; 

     if(mysql_num_rows($result) > 0) { 

      // echo "YES THEY ARE FRIENDS"; 
      return true; 

     } else { 

      //echo "NO THEY ARE NOT FRIENDS"; 
      return false; 
     } 

     //return $return; 

     //echo $return; 
     } // EO method - is_connection 


    } // EO class 

} //EO if !class_exists

來源

2014-01-10 17:50:03 dev

'return = true;'？ –

瞭解它，謝謝:) – dev

修改你的類：

if(!class_exists('my_connections')) { 
    class my_connections { 

     /* --------------- CHECKS IF CONNECTION EXISTS */ 
     public function is_connection($member_id, $connection_id) { 

      global $db; 

      $sql = "SELECT * FROM `my_connections` WHERE `member_id` = '".$member_id."' AND `connection_id` = '".$connection_id."'"; 
      $result = @mysql_query($sql,$db); check_sql(mysql_error(), $sql, 0); 

      if(mysql_num_rows($result) > 0) { 
       echo "YES THEY ARE FRIENDS"; // message is echoed when you call this method 
       return true; // your variable is set 
      } 
      else { 
       echo "NO THEY ARE NOT FRIENDS"; 
       return false; 
      } 
     } 
    } // EO class 
} //EO if !class_exists

並且代碼：

$mc = new my_connections; 

$test = $mc->is_connection('2154', '139'); // will automatically echo something from the class and set $test to true or false

來源

2014-01-10 17:51:25

這一個作品。謝謝。 –

很酷你修好了:) –

PHP類返回回聲但不是布爾

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