Check the submit button name to see if the form has been submitted in PHP

Description

The following code shows how to check the submit button name to see if the form has been submitted.

Example


<html>/*w  ww .j av  a 2  s. co m*/
<body>
<?php
$self = $_SERVER['PHP_SELF'];
$username = $_POST['username'];
$useraddr = $_POST['useraddr'];
$comments = $_POST['comments'];
$sent = $_POST['sent'];

$form ="<form action=\"$self\" method=\"post\">";
$form.="Name:<input type=\"text\" name=\"username\"";
$form.=" size=\"30\" value=\"$username\" >";
$form.="Email:<input type=\"text\" name=\"useraddr\"";
$form.=" size=\"30\" value=\"$useraddr\">";
$form.="Comments:<textarea name=\"comments\" >";
$form.="$comments</textarea><br/>";
$form.="<input type=\"submit\" name=\"sent\" value=\"Send Form\">";
$form.="</form>";

if($sent)
{
  $valid=true;

  if( !$username )
  { $errmsg.="Enter your name...<br />"; $valid = false; }

  if( !$useraddr )
  { $errmsg .="Enter your email address...<br />"; $valid = false; }

  if( !$comments )
  { $errmsg.="Enter your comments...<br />"; $valid = false; }

  $useraddr = trim($useraddr);
  $_name = "/^[-!#$%&\'*+\\.\/0-9=?A-Z^_'{|}~]+";
  $_host = "([-0-9A-Z]+\.)+";
  $_tlds = "([0-9A-Z]){2,4}$/i";
  if( !preg_match( $_name."@".$_host .$_tlds,$useraddr ) )
  { 
    $errmsg.="Email address has incorrect format!<br />";
    $valid=false;
  }
}

if($valid != true)
{
  echo( $errmsg.$form );
}
else
{
  $to = "php@h.com";

  $re = "Feedback from $username";

  $msg = $comments;

  $headers  = "MIME-Version: 1.0\r\n";
  $headers .= "Content-type: text/html;";   
  $headers .= "charset=\"iso-8859-1\"\r\n";

  $headers .= "From: $useraddr \r\n";

  if(mail($to,$re,$msg, $headers))
  { echo("Your comments have been sent - thanks $username");}

}
?>

</body></html>

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Check the submit button name to see if the form has been submitted in PHP

Description

Example

PHP Form

Form Demo