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/**
 * Remove the directory and its content (all files and subdirectories).
 * @param string $dir the directory name
 */
function rmrf($dir) {
    foreach (glob($dir) as $file) {
        if (is_dir($file)) { 
            rmrf("$file/*");
            rmdir($file);
        } else {

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//Datatable Refresh
$('.dataTables').DataTable().ajax.reload();
// or
$('#example-select').on('change', function(){
    $('#example').DataTable().ajax.reload(); 
});


//Destroy the old datatable
$('.dataTables').dataTable().fnDestroy();

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What is sequence?
To generate sequential integers/numbers in database.

all sequences are maintain in system table called user_sequences;

desc user_sequences;

To check all sequences in the table as follows:

select sequence_name from user_sequences;

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//Datatable
++++++++++++Datatable JS+++++++++++
$('#dataTable').DataTable(
    {
         "processing": true,  // Show processing
         "serverSide": true,  // Server side processing

        "ajax":{
              url :  '<?= route("dataProcessing")?>',
              type : "POST",

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    //Simple Application
    <div id="myReactApp1"></div>
    <div id="myReactApp2"></div>   
    <div id="myReactApp3"></div>   
    <script type="text/babel">

      class Man extends React.Component { 
        render() { 
          return <h1>{"Name: "+this.props.name+", Age: "+this.props.age}</h1>
        } 

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The top 3 JavaScript templating engines:
https://www.npmjs.com/package/underscore
https://www.npmjs.com/package/handlebars
https://www.npmjs.com/package/ejs

//v.01
//var express = require('express');
//var app = express();
var app = require('express')(); //server creation

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Runtime vs Compile time:
-> In computer programming, event-driven programming is a programming paradigm in which the flow of the program is determined by events such as user actions (mouse clicks, key presses), sensor outputs, or messages from other programs/threads.
-> The source code must be compiled into machine code in order to become and executable program. This compilation process is referred to as compile time.(think of a compiler as a translator) A compiled program can be opened and run by a user. When an application is running, it is called runtime
-> In computer science, asynchronous I/O, or "Non-sequential I/O" is a form of input/output processing that permits other processing to continue before the transmission has finished. Input and output (I/O) operations on a computer can be extremely slow compared to the processing of data.

What is a CGI Script?
A CGI script is any program that runs on a web server.


//There is no window object like browser console. We can use like this as global.

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-> A multidimensional array is an array containing one or more arrays. A two-dimensional array is an array of arrays (a three-dimensional array is an array of arrays of arrays).
//Array Functions:
array_pop() ->pops an element off end of the array.
array_push() ->pushes an element into the end of the array.
array_shift() ->pops an element off the beginning of the array.
array_unshift() ->pushes an element into the beginning of the array.
array_key_exists($key, $array2)
array_diff(array1,array2,array3...);
array_intersect($array1, $array2);
array_search("red",$a);

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//Refresh particular element with jQuery
1. $("#printablediv").load(location.href + " #printablediv"); // Add space between URL and selector.
   Or
   $("#MainForm").load(location.href+" #MainForm", function() {
                            $(".select2").select2();
                        });
2. $('#showDetaildModalBody').load("<?php echo base_url('setup/OrganizationSetup/create')?>");
3. $("#find_gen_sdl").trigger("click");
4. Another Ajax Request inside Success Method
5. location.reload();

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//JSON is a light-weight, language independent, data interchange format.
-> JSON Encode and Decode
-> JSON Encode: 
->PHP json_encode() function is used for encoding JSON in PHP. Objects in PHP can be converted into JSON by using the PHP function json_encode().
i.e, 
$myObj->name = "John";
$myObj->age = 30;
$myObj->city = "New York";
$myJSON = json_encode($myObj);
echo $myJSON;