Datepicker Initializer (PHP) (jQuery) (jQuery UI) (Datepicker)

Datepicker Initializer (PHP) (jQuery) (jQuery UI) (Datepicker).php

<?php
function createDateRangeArray($strDateFrom,$strDateTo)
{
    // takes two dates formatted as YYYY-MM-DD and creates an
    // inclusive array of the dates between the from and to dates.

    // could test validity of dates here but I'm already doing
    // that in the main script

    $aryRange=array();

    $iDateFrom=mktime(1,0,0,substr($strDateFrom,5,2),     substr($strDateFrom,8,2),substr($strDateFrom,0,4));
    $iDateTo=mktime(1,0,0,substr($strDateTo,5,2),     substr($strDateTo,8,2),substr($strDateTo,0,4));

    if ($iDateTo>=$iDateFrom)
    {
        array_push($aryRange,date('Y-m-d',$iDateFrom)); // first entry
        while ($iDateFrom<$iDateTo)
        {
            $iDateFrom+=86400; // add 24 hours
            array_push($aryRange,date('Y-m-d',$iDateFrom));
        }
    }
    return $aryRange;
}

// Create a daterange array

$all_availability_date = $wpdb->get_results('SELECT DISTINCT(from_date), to_date FROM '.$table_name, ARRAY_A);

$dateSet = array();
foreach ($all_availability_date as $key => $dateRange) {  
  $dateSet = array_merge($dateSet, createDateRangeArray($dateRange['from_date'],$dateRange['to_date']));
}

gistfile1.phtml

<input type="hidden" name="date_ranges" value="<?php echo htmlentities(json_encode($dateSet)) ?>">

gistfile2.js

// Disable a certain date range. Minimum Date today. Constrain Input. 'From' and 'to' datepicker set.

$(function() {

	disabledDays = jQuery.parseJSON($('input:hidden[name=date_ranges]').val());

	$( "#from" ).datepicker({
		dateFormat: "yy-mm-dd",
		defaultDate: "+1w",
		changeMonth: true,
		minDate: 0,
		constrainInput: true,
		beforeShowDay: function(date){
	        var string = jQuery.datepicker.formatDate('yy-mm-dd', date);
	        return [$.inArray(string, disabledDays) == -1];
	    },
	   	onClose: function( selectedDate ) {
			$( "#to" ).datepicker( "option", "minDate", selectedDate );
		}
	});



	 $( "#to" ).datepicker({
		dateFormat: "yy-mm-dd",
		defaultDate: "+1w",
		changeMonth: true,
	   	minDate: 0,
	   	constrainInput: true,
		beforeShowDay: function(date){
	        var string = jQuery.datepicker.formatDate('yy-mm-dd', date);
	        return [$.inArray(string, disabledDays) == -1];
	    },
	   	onClose: function( selectedDate ) {
			$( "#from" ).datepicker( "option", "maxDate", selectedDate );
		}
	});

});