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This topic created in 2649 days ago, the information mentioned may be changed or developed.
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>a small calculate</title>
</head>
<body>
<form>
<input type="text" name="num1" placeholder="number 1">
<input type="text" name="num2" placeholder="number 2">
<select name="operator">
<option>None</option>
<option>Add</option>
<option>Subtract</option>
<option>Multiply</option>
<option>Divide</option>
</select>
<br>
<button name="submit" value="good submit" type="submit" >Calculate</button>
</form>
<p>the answer is:</p>
<?php
if(isset($_GET['submit'])){
$result1 = $_GET('num1');
$result2 = $_GET('num2');
$operator = $_GET('operator');
switch($operator){
case "None":
echo "Error,you need select a method.";
break;
case "Add":
echo $result1 + $result2;
break;
case "Subtract":
echo $result1 - $result2;
break;
case "Multiply":
echo $result1 * $result2;
break;
case "Divide":
echo $result1 / $result2;
break;
}
}
?>
</body>
</html>
运行后测试：文本框输入值后，点击 calculate 按钮返回错误：
Fatal error: Function name must be a string in /Applications/XAMPP/xamppfiles/htdocs/calculate.php on line 29
请问如何解决呢？
代码片段：
28 行 if(isset($_GET['submit'])){
29 行 $result1 = $_GET('num1');
30 行 $result2 = $_GET('num2');
31 行 $operator = $_GET('operator');
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>a small calculate</title>
</head>
<body>
<form>
<input type="text" name="num1" placeholder="number 1">
<input type="text" name="num2" placeholder="number 2">
<select name="operator">
<option>None</option>
<option>Add</option>
<option>Subtract</option>
<option>Multiply</option>
<option>Divide</option>
</select>
<br>
<button name="submit" value="good submit" type="submit" >Calculate</button>
</form>
<p>the answer is:</p>
<?php
if(isset($_GET['submit'])){
$result1 = $_GET('num1');
$result2 = $_GET('num2');
$operator = $_GET('operator');
switch($operator){
case "None":
echo "Error,you need select a method.";
break;
case "Add":
echo $result1 + $result2;
break;
case "Subtract":
echo $result1 - $result2;
break;
case "Multiply":
echo $result1 * $result2;
break;
case "Divide":
echo $result1 / $result2;
break;
}
}
?>
</body>
</html>
运行后测试：文本框输入值后，点击 calculate 按钮返回错误：
Fatal error: Function name must be a string in /Applications/XAMPP/xamppfiles/htdocs/calculate.php on line 29
请问如何解决呢？
代码片段：
28 行 if(isset($_GET['submit'])){
29 行 $result1 = $_GET('num1');
30 行 $result2 = $_GET('num2');
31 行 $operator = $_GET('operator');
 | 1 898684526 Feb 6, 2019 获取 get 参数应该是 [] 而不是() |
 | 2 caola Feb 6, 2019 $_GET 获取的数据并不存在， 先判断是否存在： $result1 = $_GET('num1') ?? 0; |
| 3 898684526 Feb 6, 2019 你从 29 行 $_GET('num1') 应该是 $_GET['num1']; |
| 4 caola Feb 6, 2019 确实是方括号问题（上面我直接复制了） |
 | 5 clf Feb 6, 2019 $_GET['xxx'] 不是 $_GET('xxx') |
 | 7 Hardrain Feb 6, 2019 var_dump($_GET)可知其为数组，应使用$_GET['parameter'] $_POST $_SERVER $_COOKIE 等也是数组 |
 | 8 orqzsf1 Feb 6, 2019 <select> <option value ="volvo">Volvo</option> <option value ="saab">Saab</option> <option value="opel">Opel</option> <option value="audi">Audi</option> </select> |
 | 9 githere OP |
 | 10 bzj Feb 8, 2019 楼主把这里当百度知道了，基础不好不去学习，跑来这里问，习惯不好 |
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