How To Avoid the Undefined Index Error

Q

How To Avoid the Undefined Index Error? - PHP Script Tips - Processing Web Forms

✍: FYIcenter.com

A

If you don't want your PHP page to give out errors as shown in the previous exercise, you should consider checking all expected input fields in $_REQUEST with the isset() function as shown in the example script below:

<?php
  if (isset($_REQUEST['name'])) {
    $name = $_REQUEST['name'];
  } else {
    $name = "";
  }
  if (isset($_REQUEST['comment'])) {
    $comment = $_REQUEST['comment'];
  } else {
    $comment = "";
  }
  print("<html><pre>");
  print("You have submitted the following information:\n");
  print("  Name = $name\n");
  print("  Comments = $comment\n");
  print("Thank you!\n");
  print("</pre></html>\n");
?>

2007-04-23, 12281👍, 0💬

💬 2016-06-26 Donald: Thanks.

How To Avoid the Undefined Index Error
How To Avoid the Undefined Index Error? - PHP Script Tips - Processing Web Forms If you don't want your PHP page to give out errors as shown in the previous exercise, you should consider checking all expected input fields in $_REQUEST with the isset() function as shown in the example script below: &... 2007-04-23, 12282👍, 0💬

Where Is the Submitted Form Data Stored
Where Is the Submitted Form Data Stored? - PHP Script Tips - Processing Web Forms When a user submit a form on your Web server, user entered data will be transferred to the PHP engine, which will make the submitted data available to your PHP script for processing in pre-defined arrays: $_GET - An as... 2007-04-23, 7297👍, 0💬

How To List All Values of Submitted Fields
How To List All Values of Submitted Fields? - PHP Script Tips - Processing Web Forms If you want list all values of submitted fields, you can write a simple loop to retrieve all entries in the $_REQUEST array. Below is an improved version of processing_forms.php to list all submited input values: &a... 2007-04-23, 6963👍, 0💬

What Happens If an Expected Input Field Was Not Submitted
What Happens If an Expected Input Field Was Not Submitted? - PHP Script Tips - Processing Web Forms Obviously, if an expected input field was not submitted, there will no entry in the $_REQUEST array for that field. You may get an execution error, if you are not checking the existence of the expecte... 2007-04-23, 5470👍, 0💬

What Are Form Input HTML Tags
What Are Form Input HTML Tags? - PHP Script Tips - Processing Web Forms HTML tags that can be used in a form to collect input data are: <SUBMIT ...> - Displayed as a button allow users to submit the form. <INPUT TYPE=TEXT ...> - Displayed as an input field to take an input string. &... 2007-04-23, 5468👍, 0💬

How To Retrieve the Submitted Form Data
How To Retrieve the Submitted Form Data? - PHP Script Tips - Processing Web Forms The best way to retrieve the form data submitted by your visitor is to use the $_REQUEST array. The keys in this array will be the field names defined in form. The values in this array will be the values entered by you... 2007-04-23, 5417👍, 0💬

What Are the Input Values of SELECT Tags
What Are the Input Values of SELECT Tags? - PHP Script Tips - Processing Web Forms SELECT tags are used in forms to provide dropdown lists. Entris in a dropdown list are defined by OPTION tags, which can provide input values in two ways: Implicit value - Provided as <OPTION>input_value& ;lt... 2007-04-23, 5367👍, 0💬

How To Generate a Form
How To Generate a Form? - PHP Script Tips - Processing Web Forms Generating a form seems to be easy. You can use PHP output statements to generate the required <FORM> tag and other input tags. But you should consider to organized your input fields in a table to make your form looks good on th... 2007-04-23, 5284👍, 0💬

How To Specify Input Values for Radio Buttons
How To Specify Input Values for Radio Buttons? - PHP Script Tips - Processing Web Forms Radio buttons can be used in a form for two situations: As a single switch - One <INPUT TYPE=RADIO ...> tag, with no input value specified. When submitted with button pushed down, you will receive a value ... 2007-04-23, 5223👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.