Using isset($_REQUEST('name')) in PHP

Q

How To Avoid the Undefined Index Error in PHP?

✍: 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");
?>

⇒ Listing All Values of Submitted Fields in PHP

⇐ Expected Input Field Not Submitted in PHP

⇑ Processing Web Forms in PHP

⇑⇑ PHP Tutorials

2016-11-15, ∼5492🔥, 0💬

$_GET, $_POST and $_REQUEST in PHP
Where Is the Submitted Form Data Stored in PHP? 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 associate array that store form data... 2016-11-15, ∼4895🔥, 0💬

Retrieving Submitted Form Data in PHP
How To Retrieve the Submitted Form Data in PHP? 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 your visitor in the input fields. The... 2016-11-15, ∼2674🔥, 0💬

Form Input HTML Tags in PHP
What Are Form Input HTML Tags in PHP? 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. <INPUT TYPE=RADIO... 2016-11-17, ∼2335🔥, 0💬

Input Values of SELECT Tags in PHP
What Are Input Values of SELECT Tags in PHP? SELECT tags are used in forms to provide dropdown lists. Entries in a dropdown list are defined by OPTION tags, which can provide input values in two ways: Implicit value - Provided as <OPTION>input_va lue</OPTION>,where input_... 2016-11-13, ∼2329🔥, 0💬

Specifying Input Values for Checkboxes in PHP
How To Specify Input Values for Checkboxes in PHP? Checkboxes can be used in a form for two situations: As a single switch - One <INPUT TYPE=CHECKBOX ...> tag, with no input value specified. When submitted with button pushed down, you will receive a value of "on". When submitted with b... 2016-11-13, ∼2245🔥, 0💬

Expected Input Field Not Submitted in PHP
What Happens If an Expected Input Field Was Not Submitted in PHP? Obviously, if an expected input field was not submitted, there will be no entry in the $_REQUEST array for that field. You may get an execution error, if you are not checking the existence of the expected entries in $_REQUEST. For exa... 2016-11-15, ∼2212🔥, 0💬

Generating a Form in PHP
How To Generate a Form in PHP? 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 the screen. The PHP script be... 2016-11-17, ∼2195🔥, 0💬

Specifying Input Values for Radio Buttons in PHP
How To Specify Input Values for Radio Buttons in PHP? 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 of "on". When submitted wit... 2016-11-13, ∼2185🔥, 0💬

Retrieving Input Values from Checkboxes in PHP
How To Retrieve Input Values for Checkboxes Properly in PHP? If multiple input values are submitted with the same field name, like the case of a group of checkboxes, you should add ([]) to the end of the field name. This tells the PHP engine that multiple values are expected for this field. The engi... 2016-11-13, ∼2135🔥, 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.