Assumptions

You have an HTML form with a variety of inputs. The action attribute of the form points to a PHP file that contains the code below.

Notes about code

This code starts by creating an array that holds the name of various inputs being submitted via a POST. getFormData() is then called, where the required fields are passed in. Inside the function an array is created to hold various pieces of data related to the form. $formData['valid'] is a boolean referencing if all data was provided and valid, $formData['fields'] is an array keyed by the name of the input with their respective value from the POST data, $formData['notValidFields'] is an array that will contain the names of any inputs that were not passed or that had non-valid data.

This logic can be easily extended with regular expressions to check for stricter data, such as email addresses and urls.

<?php

$requiredFields = array('field1', 'field2', 'field3', 'field4');
$formData = getFormData($requiredFields);

function getFormData($requiredFields){
       $formData = array();
       $formData['valid'] = true;
       $formData['fields'] = array();
       $formData['notValidFields'] = array();

       for($a = 0; $a < count($requiredFields); $a++){
               $field = $requiredFields[$a];
               if(isset($_POST[$field])){
                       $value = $_POST[$field];
                       if(empty($value)){
                               $formData['valid'] = false;
                               $formData['notValidFields'][] = $field;
                       }else{
                               $formData['fields'][$field] = $value;
                       }
               }else{
                       $formData['valid'] = false;
                       $formData['notValidFields'][] = $field;
               }
       }
       return $formData;
}

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Table row in a loop:

<!-- Before loop -->
<?php $c = 0; ?>

<!-- Start loop -->
<tr class="<?=($c++%2==1) ? 'odd' : 'even' ?>">
<!-- End loop -->

CSS:

.even { background-color:#FFF; }
.odd { background-color:#666; }

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<?php
  header( 'Location: http://www.yoursite.com/new_page.html' ) ;
?>

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Can be used multiple times:

<?php include("navigation.php"); ?>

Once only:

<?php include_once("navigation.php"); ?>

Including from the root:

<?php
   $path = $_SERVER['DOCUMENT_ROOT'];
   $path .= "/common/header.php";
   include_once($path);
?>

Reference URL

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if ( eregi("MSIE", getenv( "HTTP_USER_AGENT" ) ) || eregi("Internet Explorer", getenv("HTTP_USER_AGENT" ) ) ) {
  // do something
}

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Check if value is in array and outputs Yes or No

<?php
$names = array( 'Bob', 'Jim', 'Mark' );
echo 'In Array? ';
if (in_array(‘foo’, $names))
   echo 'Yes';
else
   echo 'No';
?>

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