How to get array parameters from URL? - php

Question

I have a form with 4 required inputs. They are being passed into the url if they are missing.
If all 4 is missing it'll look like:
?required[0]=field_name&required[1]=field_email&required[2]=field_number&required[3]=field_desc
If the first one field_name is missing, the array will be pushed forward one, so field_email will be [0]. Which means that the array is always in the 0,1,2,3 order.
What I want to find out is how can I retrieve the information so I can put a red border around the input that is missing? What I need is something like:
while ($i=0,$i<=3,$i++) {
do ($requiredArray[i] == 'field_email') {
echo '<script type="text/javascript">$("#name)".css("border","1px solid #ff0000");</script>';
} while ();
endwhile;
}

Answer 1

You can also use array_search in php as follows :
array_search("field_name",$_GET['required']);
if the value is greater than or equal to zero then you can do the processing.
Like, you can have all the values in a array variable say $required_array and you can use foreach loop like as follows:
foreach($required_array as $val){
if(!(array_search($val,$_GET['required'])>=0)){
echo '<script type="text/javascript">$("#'.$val.')".css("border","1px solid #ff0000");</script>';
}
}

Answer 2

Look into form validation using Jquery it will be simpler and more extensible.
http://docs.jquery.com/Plugins/Validation

Answer 3

Here's an example for a form that preforms the validations on the server-side:
<?php
$first_name = $_GET['fname'];
$last_name = $_GET['lname'];
$email = $_GET['email'];
$submit = $_GET['submit'];
if(empty($first_name) && !empty($submit)){
$missing_fname = 1;
}
if(empty($last_name) && !empty($submit)){
$missing_lname = 1;
}
if(empty($email) && !empty($submit)){
$missing_email = 1;
}
?>
<table><form action="" method="get">
<tr><td>Enter First Name:</td><td><input type="text" id="fname" name="fname" value="<?php echo $first_name; ?>" ></td><td><?php if($missing_fname == 1) echo "<font color='red'>This field is Mandatory!</font>" ?></td></tr>
<tr><td>Enter Last Name:</td><td><input type="text" id="lname" name="lname" value="<?php echo $last_name; ?>" ></td><td><?php if($missing_lname == 1) echo "<font color='red'>This field is Mandatory!</font>" ?></td></tr>
<tr><td>Enter email:</td><td><input type="text" id="email" name="email" value="<?php echo $email; ?>"></td><td><?php if($missing_email == 1) echo "<font color='red'>This field is Mandatory!</font>" ?></td></tr>
<tr><td></td><td><input type="submit" value="submit" name="submit" id="submit"></td></tr>
</form>
</table>