Question

当循环遍历下面的foreach循环时，每次执行循环时都会得到echo输出。如何将这些消息减少到只有一条最终消息？

即。如果仅"success messages"，则回显"Success"，如果发生错误("fail" or "nothing saved" message)，则回显"Fail"。一旦发生错误，循环不应停止，但应完全继续。最后，我只想知道是否发生了错误或结果是否未保存。

if(!isset($_POST["submitbutton"])) {
  echo "Click this button to save your input.";
} else {
  foreach($_POST['tipp_id'] as $key => $tipp_id) {
    if($tipp_id > 0) {
      $result="
      //SQL query
      ";
      $query=mysqli_query($conn,$result);
      if($query) {
        echo "Success.<br>";
      } else {
        echo "Fail.<br>";
      }
    } else {
      echo "Nothing saved.";
    }
  }
}

Answer 1

每个人都建议你一个答案。我的建议如下： -

<?php
$failed_query = array(); // create an empty array to get which query fails
$failed_count = 0; // count to come to know how many query failed
$success_count = 0; // count to come to know how many query succeed
if(!isset($_POST["submitbutton"])) {
  echo "Click this button to save your input.";
}else {
  foreach($_POST['tipp_id'] as $key => $tipp_id) {
    if($tipp_id > 0) {
      $result="//SQL query";
      $query=mysqli_query($conn,$result);
      if($query) { // if query runs
        $success_count++; // increase success counter
      } else {
        $failed_count++; // increase failed counter
        $failed_query[] = $result; // insert failed query to the array
      }
    }
  }
}
if($success_count > $failed_count){
    echo "final output is success";
 }else{
   echo "final output is failed";
 }
echo "query executed successfully(Number)".$success_count;
echo "query execution failed(Number)".$failed_count;
echo "Failed queries are <br/>";
echo "<pre/>";print_r($failed_query);
?>

注意： -

1.你想要的最终状态，你将获得成功或失败。

2.它会让您清楚地了解已成功执行的查询次数以及失败次数。

3.此外，您还可以检查哪些查询失败以及原因（通过检查失败的数组）

Answer 2

在循环之前设置变量，并在失败时更改它。然后在之后回复它。

$msg = '';

if(!isset($_POST["submitbutton"])) {
    echo "Click this button to save your input.";
} else {
    foreach($_POST['tipp_id'] as $key => $tipp_id) {
        if($tipp_id > 0) {
            $result = "//SQL query";
            $query = mysqli_query($conn, $result);
            if(!$query) {
                $msg = 'Fail';
            }
        } else {
            $msg = 'Nothing saved.';
        }
    }
}
if(!empty($msg)) {
    echo $msg;
}

Answer 3

您可以使用错误计数器：

<?php

if(!isset($_POST["submitbutton"])) {
  echo "Click this button to save your input.";
} else {
  $errors = 0;                   //<========== ERROR COUNTER.
  foreach($_POST['tipp_id'] as $key => $tipp_id) {
    if($tipp_id > 0) {
      $result="
      //SQL query
      ";
      $query=mysqli_query($conn,$result);
      if($query) {
        //echo "Success.<br>";
      } else {
        //echo "Fail.<br>";
        $errors++;             //<===========
      }
    } else {
      //echo "Nothing saved.";
      $errors++;               //<============
    }
  }
  if ( $errors == 0 )
       echo "Success";
  else echo "Fail";
}

?>

Answer 4

if(!isset($_POST["submitbutton"])) {
  echo "Click this button to save your input.";
} else {
  $output = "";
  foreach($_POST['tipp_id'] as $key => $tipp_id) {
    if($tipp_id > 0) {
      $result="
      //SQL query
      ";
      $query=mysqli_query($conn,$result);
      if($query) {
        $output .= "Success.<br>";
      } else {
        $output .= "Fail.<br>";
      }
    } else {
      $output .= "Nothing saved.";
    }
  }
  echo $output;
}

Answer 5

您可以通过添加标记来实现此目的。

if(!isset($_POST["submitbutton"])) {
  echo "Click this button to save your input.";
} else {
  $flag_success = True;
  foreach($_POST['tipp_id'] as $key => $tipp_id) {
    if($tipp_id > 0) {
      $result="
      //SQL query
      ";
      $query=mysqli_query($conn,$result);
      if($query) {
      } else {
        $flag_success = False;
      }
    } else {
      echo "Nothing saved.";
    }
  }
  if($flag_success)
    echo "success";
  else
    echo "error";
}

基本思想是我们假设所有交易在启动时都是成功的。现在如果有错误，我们将布尔标志设置为false。然后最后检查foreach循环外的状态标志并相应地打印输出

Answer 6

如果你想继续遍历数组（即在遇到错误时不是break），一般来说，你可以这样做：

$failureHappened = false;

foreach($arr as $elem) {
    // do whatever with $elem to check "success" or "failure"
    if (conditional_check($elem) == true) {
        // success
    } else {
        // failure
        $failureHappened = true;
    }
}

if ($failureHappened) {
    // error handling
} else {
    // success case, if you need to do anything here
}

如果循环结束时$failureHappened仍为false，则表示没有错误。如果是true，则发生一个或多个错误/失败。如果您不特别关心导致错误的原因，只是发生了这样的错误，这很有用。

Answer 7

if(!isset($_POST["submitbutton"])) {
  echo "Click this button to save your input.";
} else {
  $failsCount = 0;
  foreach($_POST['tipp_id'] as $key => $tipp_id) {
    if($tipp_id > 0) {
      $result="
      //SQL query
      ";
      $query=mysqli_query($conn,$result);
      if(!$query) {
        $failsCount++;
      }
    } else {
      $failsCount++;
    }
  }
  echo ($failsCount == 0) ? "Success.<br>" : "Fail.<br>";
}

Answer 8

如果我理解正确，如果所有查询都运行正常，您希望打印“成功”，如果查询失败，则打印“失败”。

为此，请使用临时变量来跟踪某个查询是否失败并使用该变量进行打印。更新的代码：

    if(!isset($_POST["submitbutton"])) {
     echo "Click this button to save your input.";
    } else {
      $temp = 0
      foreach($_POST['tipp_id'] as $key => $tipp_id) {
      if($tipp_id > 0) {
       $result="
       //SQL query
       ";
       $query=mysqli_query($conn,$result);
       if($query) {
         $temp = 1  // set the temporary variable accordingly
         //echo "Success.<br>";
       } else {
         $temp = 2
         //echo "Fail.<br>";
       }
      } else {
        echo "Nothing saved.";
     }
   }
    if($temp == 1) {
      echo "Success.<br>";
    } elseif($temp == 2) {
      echo "Fail.<br>";
    }
  }

仅为foreach循环显示一条消息

8 个答案: