I am new to PHP. I am following this tutorial for creating an address book, I've copied the code exactly and yet I keep on getting these Notice's. I take it displays the message because I am using variable names that have not yet previously defined. Is there a way to resolve this? Is this showing because I have PHP set to show all errors and warnings?

Here is a list of messages I've been getting:

Notice: Use of undefined constant op - assumed 'op' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 2

Notice: Use of undefined constant op - assumed 'op' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 51

Notice: Use of undefined constant first_name - assumed 'first_name' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 54

Notice: Use of undefined constant last_name - assumed 'last_name' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 54

Notice: Use of undefined constant address - assumed 'address' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 75

Notice: Use of undefined constant telephone_number - assumed 'telephone_number' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 86

Notice: Use of undefined constant mobile_number - assumed 'mobile_number' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 94

Notice: Use of undefined constant email - assumed 'email' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 102

Notice: Use of undefined constant note - assumed 'note' in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 110

    wow, that fixed everything except for this one

    Notice: Undefined index: op in F:\WEBROOT\public\main\PHP\AddressBook\addentry.php on line 2

      That means you're specifying "op" as the index of an array somewhere, but that index doesn't exist. Let's see your code and we'll figure out the problem in a flash!

        4 years later

        Well, I've got the same problem with the same script..Here is the code:

        <?php
     if ($_POST[op] != "add") {
        //haven't seen the form, so show it
        $display_block = "<h1>Add an Entry</h1>
       <form method=\"post\" action=\"$_SERVER[PHP_SELF]\">
       <P><strong>First/Last Names:</strong><br>
       <input type=\"text\" name=\"f_name\" size=30 maxlength=75>
       <input type=\"text\" name=\"l_name\" size=30 maxlength=75>

  <P><strong>Address:</strong><br>
  <input type=\"text\" name=\"address\" size=30>

  <P><strong>City/State/Zip:</strong><br>
  <input type=\"text\" name=\"city\" size=30 maxlength=50>
  <input type=\"text\" name=\"state\" size=5 maxlength=2>
  <input type=\"text\" name=\"zipcode\" size=10 maxlength=10>

  <P><strong>Address Type:</strong><br>
  <input type=\"radio\" name=\"add_type\" value=\"home\" checked> home
  <input type=\"radio\" name=\"add_type\" value=\"work\"> work
 <input type=\"radio\" name=\"add_type\" value=\"other\"> other

 <P><strong>Telephone Number:</strong><br>
 <input type=\"text\" name=\"tel_number\" size=30 maxlength=25>
 <input type=\"radio\" name=\"tel_type\" value=\"home\" checked> home
 <input type=\"radio\" name=\"tel_type\" value=\"work\"> work
 <input type=\"radio\" name=\"tel_type\" value=\"other\"> other

 <P><strong>Fax Number:</strong><br>
 <input type=\"text\" name=\"fax_number\" size=30 maxlength=25>
 <input type=\"radio\" name=\"fax_type\" value=\"home\" checked> home
 <input type=\"radio\" name=\"fax_type\" value=\"work\"> work
 <input type=\"radio\" name=\"fax_type\" value=\"other\"> other

 <P><strong>Email Address:</strong><br>
 <input type=\"text\" name=\"email\" size=30 maxlength=150>
 <input type=\"radio\" name=\"email_type\" value=\"home\" checked> home
 <input type=\"radio\" name=\"email_type\" value=\"work\"> work
 <input type=\"radio\" name=\"email_type\" value=\"other\"> other

 <P><strong>Personal Note:</strong><br>
 <textarea name=\"note\" cols=35 rows=5 wrap=virtual></textarea>
  <input type=\"hidden\" name=\"op\" value=\"add\">

 <p><input type=\"submit\" name=\"submit\" value=\"Add Entry\"></p>
 </FORM>";

  } else if ($_POST[op] == "add") {
     //time to add to tables, so check for required fields
      if (($_POST[f_name] == "") || ($_POST[l_name] == "")) {
         header("Location: addentry.php");
        exit;
      }

  //connect to database
  $conn = mysql_connect("localhost", "hari", "hari")
      or die(mysql_error());
  mysql_select_db("hari",$conn) or die(mysql_error());

  //add to master_name table
  $add_master = "insert into master_name values ('0', now(), now(),
      '$_POST[f_name]', '$_POST[l_name]')";
  mysql_query($add_master) or die(mysql_error());

  //get master_id for use with other tables
  $master_id = mysql_insert_id();

  if (($_POST[address]) || ($_POST[city]) || ($_POST[state]) ||
       ($_POST[zipcode])) {
      //something relevant, so add to address table
      $add_address = "insert into address values ('0', $master_id,
           now(), now(), '$_POST[address]', '$_POST[city]',
           '$_POST[state]', '$_POST[zipcode]', '$_POST[add_type]')";
      mysql_query($add_address) or die(mysql_error());
  }

  if ($_POST[tel_number]) {
      //something relevant, so add to telephone table
      $add_tel = "insert into telephone values ('0', $master_id,
       now(), now(), '$_POST[tel_number]', '$_POST[tel_type]')";
      mysql_query($add_tel) or die(mysql_error());
  }

  if ($_POST[fax_number]) {
      //something relevant, so add to fax table
      $add_fax = "insert into fax values ('0', $master_id, now(),
       now(), '$_POST[fax_number]', '$_POST[fax_type]')";
      mysql_query($add_fax) or die(mysql_error());
 }

  if ($_POST[email]) {
      //something relevant, so add to email table
      $add_email = "insert into email values ('0', $master_id,
           now(), now(), '$_POST[email]', '$_POST[email_type]')";
    mysql_query($add_email) or die(mysql_error());
  }

  if ($_POST[note]) {
      //something relevant, so add to notes table
    $add_note = "insert into personal_notes values ('0', $master_id,
          now(), now(), '$_POST[note]')";
     mysql_query($add_note) or die(mysql_error());
 }

 $display_block = "<h1>Entry Added</h1>
 <P>Your entry has been added. Would you like to
 <a href=\"addentry.php\">add another</a>?</p>";
 }
 ?>
 <HTML>
 <HEAD>
 <TITLE>Add an Entry</TITLE>
 </HEAD>
 <BODY>
 <? print $display_block; ?>
 </BODY>
 </HTML>

          First off, I'd advise you not to bump this rather old (four years!) thread. Wow, it's been a while since I've been on here. You may get more help if you simply create a new thread in the Newbies section.

          That said, you didn't say exactly what error you're getting or on what line you're receiving it. I can only assume it's tripping up at the "if ($POST[op] != "add") {" line, which could be for one of two reasons:

          • You need to access string array indices within quotes, like $_POST['op']

          • You've not defined $_POST['op'] and you're not checking to see if the variable exists first. Try using isset()

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