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<select name="nationality">
  <option value="">-- select one --</option>
  <option value="afghan">Afghan</option>
  <option value="albanian">Albanian</option>
  <option value="algerian">Algerian</option>
  <option value="american">American</option>
  <option value="andorran">Andorran</option>
  <option value="angolan">Angolan</option>
  <option value="antiguans">Antiguans</option>
  <option value="argentinean">Argentinean</option>

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<?php
$challenge = $_REQUEST['hub_challenge'];
$verify_token = $_REQUEST['hub_verify_token'];

// Set this Verify Token Value on your Facebook App 
if ($verify_token === 'testtoken') {
  echo $challenge;
}

$input = json_decode(file_get_contents('php://input'), true);

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<?php
namespace Mauris\Utility;

class NricUtility
{
    public static function validate($nric)
    {
        $nric = strtoupper($nric);
        if (strlen($nric) == 9) {
            $hash = self::checksum(substr($nric, 0, 8));

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Receiving Facebook Leads on a Webhook

1 - Create an App

Head over to developer.facebook.com and create an App

2 - Setup the webhook

On your server, create a facebook webhook that will handle facebook calls. Then create a "leadgen" webhook on you App: https://developers.facebook.com/docs/graph-api/webhooks/v2.5

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<span>
     <select name="month">
        <option value="January">January</option>
        <option value="February">February</option>
        <option value="March">March</option>
        <option value="April">April</option>
        <option value="May">May</option>
        <option value="June">June</option>
        <option value="July">July</option>
        <option value="August">August</option>

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<select name="year">
  <option value="">Year</option>
  <?php for ($year = date('Y'); $year > date('Y')-100; $year--) { ?>
	<option value="<?php echo $year; ?>"><?php echo $year; ?></option>
	<?php } ?>
</select>
<select name="month">
	<option value="">Month</option>
	<?php for ($month = 1; $month <= 12; $month++) { ?>
	<option value="<?php echo strlen($month)==1 ? '0'.$month : $month; ?>"><?php echo strlen($month)==1 ? '0'.$month : $month; ?></option>

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D3.js Tree Layout chart

A basic tree layout with nodes that are aware of the sizes of other nodes. Also supports zoom functionality. I originally created this to answer my own Stackoverflow question on jsFiddle and am simply moving it over to Codepen.

A Pen by Augustus Yuan on CodePen.

License.

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<meta charset="UTF-8">
<style>

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

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D3 Hierarchy Layouts

Set of D3 hierarchy layouts including: tree, cluster, treemap, pack, partition and sunburst. More info about layouts: http://d3indepth.com/layouts/

A Pen by Karol Stopyra on CodePen.

License.

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Collapsible hierarchy tree d3js

A Pen by Rémi TRAN on CodePen.

License.