Question

您好我是php新手并测试了一些代码我得到了一个未定义函数的错误

<!DOCTYPE html>
<html>
<head>
</head>
<body>

<form method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
	<input type="text" placeholder="type your full name" name="fullname">
	<input type="submit" name="submit" value="submit">
</form>

<?php
	$getName = "" ;
	if ($_SERVER["REQUEST_METHOD"] == "POST") {
		$getName = "hello ".test_input($_POST['fullname']);  //Fatal error: Call to undefined function test_input() in C:\xampp\htdocs\ctPHP.php on line 15
	  
	 function test_input($data) {
		  $data = trim($data);
		  $data = stripslashes($data);
		  $data = htmlspecialchars($data);
		  return $data;
	 }
	} 
	echo $getName;
?>

</body>
</html>

我想知道如何解决这个问题，我想在文本字段中回显出键入的名称，如何解决这个问题

Answer 1

只需要在创建函数后回显。

首先创建函数test_input()然后在声明/定义后使用它。

<!DOCTYPE html>
<html>
<head>
</head>
<body>

<form method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
    <input type="text" placeholder="type your full name" name="fullname">
    <input type="submit" name="submit" value="submit">
</form>

<?php
    $getName = "" ;
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
         function test_input($data) {
          $data = trim($data);
          $data = stripslashes($data);
          $data = htmlspecialchars($data);
          return $data;
     }
        $getName = "hello ".test_input($_POST['fullname']);  //Fatal error: Call to undefined function test_input() in C:\xampp\htdocs\ctPHP.php on line 15


    } 
    echo $getName;
?>

</body>
</html>

我收到错误调用未定义的函数

1 个答案: