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Segue o código ajustado conforme sugestão do @perdeu, mas usando método POST e botões.

Procurei manter a simplicidade do original, acrescentando alguns pequenos detalhes para ilustrar o uso do _value_ do _submit_, e mais alguma sutilezas.

<!DOCTYPE HTML>

<head>

<title>Exemplo</title>

</head>

<body>

Primeiro Numero: <input name="num1" type="text"><br>

Segundo numero: <input name="num2" type="text"><br>

</form>

<?php

</body>

</html>>

<?php

$a = $_POST['num1'];

$b = $_POST['num2'];

$op= $_POST['operacao'];

if( !empty($op) ) {

if($op == '+')

$c = $a + $b;

else if($op == '-')

$c = $a - $b;

else if($op == '*')

$c = $a*$b;

else

$c = $a/$b;

echo "O resultado da operação é: $c";

}

</body>

</html>

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Original text

Open file

Segue o código ajustado conforme sugestão do @perdeu, mas usando método POST e botões.
Procurei manter a simplicidade do original, acrescentando alguns pequenos detalhes para ilustrar o uso do _value_ do _submit_, e mais alguma sutilezas.

<!DOCTYPE HTML>
    <html lang = "pt-br">
    <head>
       <title>Exemplo</title>
       <meta charset = "UTF-8">
    </head>
    <body>
       <form action="" method="post" >
          Primeiro Numero: <input name="num1" type="text"><br>
          Segundo numero: <input name="num2" type="text"><br>
          <input type="submit" name="operacao" value="+">     
          <input type="submit" name="operacao" value="-">     
          <input type="submit" name="operacao" value="*">     
          <input type="submit" name="operacao" value="/">     
       </form> 
    <?php
    
       $a = $_POST['num1'];
       $b = $_POST['num2'];
       $op= $_POST['operacao'];
    
       if( !empty($op) ) {
          if($op == '+')
             $c = $a + $b;
          else if($op == '-')
             $c = $a - $b;
          else if($op == '*')
             $c = $a*$b;
          else
             $c = $a/$b;
       
          echo "O resultado da opera&ccedil;&atilde;o &eacute;: $c";
       }
    
    ?>       
    </body>
    </html>

Changed text

Open file

<!DOCTYPE HTML>
    <html lang = "pt-br">
    <head>
       <title>Exemplo</title>
       <meta charset = "UTF-8">
    </head>
    <body>
       <form action="calculadora.php" method="post" >
          Primeiro Numero: <input name="num1" type="text"><br>
          Segundo numero: <input name="num2" type="text"><br>
          <input type="submit" name="operacao" value="+">     
          <input type="submit" name="operacao" value="-">     
          <input type="submit" name="operacao" value="*">     
          <input type="submit" name="operacao" value="/">     
       </form> 
           
    </body>
    </html>>
    
    
    
     <?php
    
       $a = $_POST['num1'];
       $b = $_POST['num2'];
       $op= $_POST['operacao'];
    
       if( !empty($op) ) {
          if($op == '+')
             $c = $a + $b;
          else if($op == '-')
             $c = $a - $b;
          else if($op == '*')
             $c = $a*$b;
          else
             $c = $a/$b;
    
          echo "O resultado da opera&ccedil;&atilde;o &eacute;: $c";
       }
    
    ?>