create a shortcode of html form - php

Question

I am trying to create a short code for html form. because I want to use this multiple time in my word-press page.
I have no idea how to do this . if any help please let help me
<form action="<?php echo get_page_link(2599) ?>" method="POST" >
<input type='hidden' name='page_id' value='2599'>
<div class="row">
<div class="form-group col-sm-3 col-md-2" id="bgform_text2">
<h4>SEARCH</h4>
<p>For Your Favourite Place</p>
</div>
<div class="form-group col-sm-5 col-md-2">
<label>Where to ? </label>
<input type="text" name="names" class="input-text full-width" placeholder="start typing here....">
</div>
<div class="form-group col-sm-5 col-md-4">
<div class="row">
<div class="col-xs-6">
<label>Arrive </label>
<div class="controls">
<input type="text" name="arive_time" id="departing">
</div>
</div>
<div class="col-xs-6">
<label>Departs </label>
<div class="controls">
<input type="text" name="depart_time" id="returning">
</div>
</div>
</div>
</div>
<div class="form-group col-sm-9 col-md-2">
<label>Sleeps </label>
<div class="controls">
<i class="fa fa-sort"></i>
<select name="sleeps">
<option value="" disabled="" selected=""></option>
<option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option></option>
</select>
</div>
</div>
<div class="form-group col-sm-3 col-md-2">
<input type="submit" value="submit" name="submit_btn" class="button">
</div>
</div>
</form>

Answer 1

Try this.
<?php
function my_shortcode(){
$pagelink = get_page_link(2599);
return '<form action="'.$pagelink.'" method="POST" >
<input type="hidden" name="page_id" value="2599">
<div class="row">
<div class="form-group col-sm-3 col-md-2" id="bgform_text2">
<h4>SEARCH</h4>
<p>For Your Favourite Place</p>
</div>
<div class="form-group col-sm-5 col-md-2">
<label>Where to ? </label>
<input type="text" name="names" class="input-text full-width" placeholder="start typing here....">
</div>
<div class="form-group col-sm-5 col-md-4">
<div class="row">
<div class="col-xs-6">
<label>Arrive </label>
<div class="controls">
<input type="text" name="arive_time" id="departing">
</div>
</div>
<div class="col-xs-6">
<label>Departs </label>
<div class="controls">
<input type="text" name="depart_time" id="returning">
</div>
</div>
</div>
</div>
<div class="form-group col-sm-9 col-md-2">
<label>Sleeps </label>
<div class="controls">
<i class="fa fa-sort"></i>
<select name="sleeps">
<option value="" disabled="" selected=""></option>
<option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option></option>
</select>
</div>
</div>
<div class="form-group col-sm-3 col-md-2">
<input type="submit" value="submit" name="submit_btn" class="button">
</div>
</div>
</form>';
}
add_shortcode('my_shortcode_name','my_shortcode');
?>
you can use this shortcode in your page
<?php echo do_shortcode('[my_shortcode_name]');?>

Answer 2

I think you are saying that you do not want to copy-paste the exact same code on multiple places inside your project, PHP has an include control structure method to take any file and use the contents on run-time.
Your code could eventually look something like this:
# form definition inside the main page that needs the form
<form action="<?php echo get_page_link(2599) ?>" method="POST" >
# include the template
<?php include('template.php') ?>
</form>
# template.php contains the html form
<input type='hidden' name='page_id' value='2599'>