Form posting does not work - php

Question

I am having trouble to post a html form. I am posting one form and getting the post value to my variable and then I am post this form but this form is not posting.
HTML code:
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST" autocomplete="off">
<div class="widget-box">
<div class="widget-title"> <span class="icon"> <i class="icon-user"></i> </span>
<h5>Amc details</h5>
</div>
<div class="widget-content">
<div class="controls controls-row">
<div class="control-group span3">
<label for="normal" class="control-label">Installation Date<span style="color:red">*</span></label>
<div class="controls">
<input type="text" id="amc-ins-date" data-date="01-02-2016" name="amc-ins-date" data-date-format="dd-mm-yyyy" class="datepicker span12" placeholder="Enter installation date">
</div>
</div>
<div class="control-group span3">
<label for="normal" class="control-label">Start Date<span style="color:red">*</span></label>
<div class="controls">
<input type="text" id="amc-start-date" data-date="01-02-2016" name="amc-start-date" data-date-format="dd-mm-yyyy" placeholder="Enter amc start date" class="datepicker span12 ins-date">
</div>
</div>
<div class="control-group span3">
<label class="control-label">End Date<span style="color:red">*</span></label>
<div class="controls">
<input type="text" id="amc-end-date" data-date="01-02-2016" name="amc-end-date" data-date-format="dd-mm-yyyy" placeholder="Enter amc end date" class="datepicker span12 ins-date">
</div>
</div>
<div class="control-group span3">
<label class="control-label">Amount<span style="color:red">*</span></label>
<div class="controls">
<input type="text" id="amc-amount" name="amc-amount" class="span12" placeholder="Enter amc amount">
</div>
</div>
</div>
</div>
<div class="form-actions">
<input style="float:right" type="submit" name="amc-installation" class="btn btn-success" value="Save">
</div>
</form>
PHP code:
// i have submitted a form here and its posted
// installation details
$mc_serial = $_POST['mc-serial'];
$mc_model = $_POST['mc-model'];
$contract_type = $_POST['contract_type'];
$no_of_copies = $_POST['no-of-copies'];
$spare_part = join(",",$_POST['spare-part']);
$eng_name = $_POST['eng-name'];
$review = $_POST['review'];
// check if the machine already exits
if(IsMachine($mc_serial,$con)){
echo msgIsMachine();
exit();
}
if($contract_type == 'AMC'){
require './forms/amc.php'; // this is the html i have shown above
} elseif ($contract_type == 'ASC') {
require './forms/asc.php';
} elseif ($contract_type == '4C') {
require './forms/4c.php';
} elseif ($contract_type == 'RENTAL') {
require './forms/rental.php';
} elseif ($contract_type == 'WARRANTY') {
require './forms/warranty.php';
}
if(isset($_POST['amc-installation']) && !empty($_POST['amc-installation'])){
echo "posted";
var_dump($_POST);($_POST);
}
The output of var_dump is NULL. I don't get any problem.

Answer 1

You echo the second form (during the script which responds to the submission of the first one), but then immediately check for values returned from it within the same script execution. You have to wait for the user to post the form back before you can check the submitted values. This would be a separate postback, and therefore a separate execution context for the PHP.
So the code to check the values from the second form needs to be in a separate section (or file) which is triggered by the submission of the second form.

Answer 2

There's no $POST in PHP you should use $_POST instead :
if(isset($_POST['amc-installation']) && !empty($_POST['amc-installation'])){
echo "posted";
var_dump($_POST);
}
NOTE : You should place the var_dump($_POST); inside the if statement, so it will be trrigered just after the submit.
Hope this helps.

Answer 3

if(isset($_POST['amc-installation']) && !empty($_POST['amc-installation'])){
echo "posted";
var_dump($_POST);
}
You should use $_POST not $POST.
Hope this will helps you :)