call funcution when clicking submit

I’ve built a WordPress plugin, this plugin has a form in front-end using a shortcode
I need the submit button to do two things, first to send the entries to the database which I did it successfully. The second thing is to build a URL from entries and run it

this is the form code:

<form name="frm" action="#" method="post" enctype="multipart/form-data">
        <tr>
            <td><?php echo __( 'Your Name', 'msf')?></td>
            <td><input type="text" name="nm"></td>
        </tr>
        <tr>
            <td><?php echo __('Mobile no' , 'msf' )?></td>
            <td><input pattern="d*" maxlength="9" type="number" name="mob"></td>
        </tr>
        <tr>
            <td></td>
            <td><input class="button-primary" type="submit" value="<?php echo __('Send' , 'msf' )?>" name="ins" action=""></td>
           <!-- alert -->
            <div class="success_msg" style="display: none">Message
                Sent Successfully</div>

            <div class="error_msg" style="display: none">Message
                Not Sent, There is some error.</div>
        </tr>
    </form>

this is my function

function SMS_SEND($message,$numbers)
    {
    $text = urlencode($message);
    $to = $numbers;
    $user="";
    $pass="";
    $sender="";
    $ch = curl_init();
curl_setopt( $ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; U; Linux i686; pt-BR; rv:1.9.2.18) Gecko/20110628 Ubuntu/10.04 (lucid) Firefox/3.6.18' );
curl_setopt( $ch, CURLOPT_URL, 'http://www.*****.com/sms/api/sendsms.php?username='.$user.'&password='.$pass.'&numbers='.$to.'&sender='.$sender.'&message='.$text );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
$result = curl_exec ( $ch );
curl_close ( $ch );
    return nl2br($result); 
     }

Answers:

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Method 1

    <?php
        if(array_key_exists('button1', $_POST)) { 
            button1(); 
        } 
        function button1() { 
            echo "This is Button1 that is selected"; 
        } 
    ?> 

    <form method="post"> 
        <input type="submit" name="button1"
                class="button" value="Button1" /> 
        
    </form> 
</head> 

</html>

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