Question

class Foo{
  private $xml;

  public function get_bar_xml($data){
    $this->xml = $this->init_xml();

    foreach($data as $key => $value){
      $this->xml->addChild(key, $value);
    }

    return $this->prepare_xml();
  }

  //... set of similar methods following with different
  // child node creation

  private function init_xml(){
    //$this->xml header generation
  }

  private function prepare_xml(){
    //add footer nodes to $this->xml
    //format output if neccesary 

    return $this->xml;
  }
}

下面是打印的代码，但是如果我不提供用户名或密码，即如果我将其保留为空，如$ username ='';;

，则会在控制台上引发sql错误

如果用户名或密码不正确或为空，我现在没有前端，该怎么办才能在控制台上打印错误

Answer 1

为避免出现此错误“ 警告：mysqli_fetch_assoc（）期望参数1为mysqli_result，请检查$ _POST是否不为空，并在其他情况下打印错误，仅用于测试。

要检查输入字段是否为空，请应用JavaScript验证以避免提交空白。

if(!empty($_POST["login"])) {
    $result = mysqli_query($conn,"SELECT * FROM users WHERE user_name='" . $_POST["user_name"] . "' and password = '". $_POST["password"]."'");
    $row  = mysqli_fetch_array($result);
    if(is_array($row)) {
    $_SESSION["user_id"] = $row['user_id'];
    } else {
    $message = "Invalid Username or Password!";
    }
}

这里是一个示例，为简化代码，如果您有任何问题，请尝试打印变量，例如var_dump和print_r

<?php
session_start();
$conn = mysqli_connect("localhost","root","","database_ex");

$message="";
if(!empty($_POST["login"])) {
    $result = mysqli_query($conn,"SELECT * FROM users WHERE user_name='" . $_POST["user_name"] . "' and password = '". $_POST["password"]."'");
    $row  = mysqli_fetch_array($result);
    if(is_array($row)) {
    $_SESSION["user_id"] = $row['user_id'];
    } else {
    $message = "Invalid Username or Password!";
    }
}else{
  //Print error message here if no username or password provided;
  echo "Invalid credentials"; 
  print_r($_POST);
  var_dump($_POST);
}
?>

Answer 2

showErrsInConsole(['err1', 'error2', 'error3']);

function showErrsInConsole(array $errors)
{
    array_walk($errors, function (&$err) {
        $err = 'echo ' . $err;
    });
    $errors = implode(';', $errors);
    $exec = "gnome-terminal -x bash -c '$errors; sleep 1; read -n 1 -p \"press any key to close\"';";
    `$exec`;
}

如何在控制台上打印错误？

2 个答案: