jQuery-Php for selecting all checkbox by clicking one checkbox

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<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
$(document).ready(function () 
{
$('#d').click(function()
{
if (this.checked==true)
{
$('input[name="vehicle[]"]').prop('checked', true);
}
if (this.checked==false)
{
$('input[name="vehicle[]"]').prop('checked', false);
}
});
});
</script>
<form action="" method="post">
<input type="checkbox" name="df" value="Bike" id="d">click to select all<br>
<input type="checkbox" name="vehicle[]" value="scooter">scooter<br>
<input type="checkbox" name="vehicle[]" value="suzuki">suzuki<br>
<input type="checkbox" name="vehicle[]" value="yamaha">yamaha<br>
<input type="checkbox" name="vehicle[]" value="honda">honda<br>
<input type="checkbox" name="vehicle[]" value="Car">car
<input type="submit" value="submit" name="sub"/>
</form>
<?php
if(isset($_POST['sub']))
{
$a=$_POST['vehicle'];
print_r($a);
}
?>

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