在php中发现解析错误[重复]

Question

This question already has an answer here:

• Reference - What does this error mean in PHP? 34 answers
• PHP parse/syntax errors; and how to solve them? 17 answers

I am new to php. So I simply translated my java code to php.

It says

Parse error: syntax error, unexpected 'counter' (T_STRING) in D:\files\xampp\htdocs\try.php on line 15.

Here is my code:

<form action="" method = "POST">

Enter the first number: <input type="number" name="FirstNum" required><br><br>

<input type = "submit" value = "Enter"/>
</form>


<?php
int counter = 0;
while (counter < 1) {

switch($_POST['FirstNum'])
{
case "1":
echo "Addition";
counter++; break;
case "2":
echo "Subtraction";
counter++; break;
case "3":
echo "Multiplication";
counter++; break;
case "4":
echo "Division";
counter++; break;
default:
echo "Invalid Operation";
}
}
?>

</div>

Answer 1

PHP variables always start with a $ sign, so whenever you use a variable the $ sign is mandatory.

The corrected code looks like:

<?php
$counter = 0;
while ($counter < 1) {

switch($_POST['FirstNum'])
{
case "1":
echo "Addition";
$counter++; break;
case "2":
echo "Subtraction";
$counter++; break;
case "3":
echo "Multiplication";
$counter++; break;
case "4":
echo "Division";
$counter++; break;
default:
echo "Invalid Operation";
}
}
?>