====== PHP example codes ======
===== Basic Examples for reading and understanding code(testing) =====
==== func_get_args ====
<code php>
<?php

function myfunction() {
	list($string) = func_get_args();
	print $string;
}

myfunction("Hello, World!");

?>
</code>output:<code>
Hello, World!
</code>
==== reference variable ====
  * Simple reference:<code php>
<?php
$a = 10;
$b = &$a;
$b++;
print $a
?>
</code> output:<code>
11
</code>
  * Custom reference<code php>
<?php

function &find_variable(&$one, &$two, &$three) {
	
	if($one > 10 && $one < 20) return $one;
	if($two > 10 && $two < 20) return $two;
	if($three > 10 && $three < 20) return $three;
}

$one = 2;
$two = 20;
$three = 15;

$var = &find_variable($one, $two, $three);

$var++;

print "1: $one, 2: $two, 3: $three";

?>
</code> output:<code>
1: 2, 2: 20, 3: 16
</code>
==== compare 2 values in the same type and value ====
<code php>
<?php
$a = 2;
$b = '2';
if ($a == $b)
	print "$a == '$b'";
else
	print "not $a == '$b'";
if ($a === $b)
	print "\n$a === '$b'";
else
	print "\nnot $a === '$b'";
?>
</code>
==== global variable ====
<code php>
<?php

$a = 20;

function myfunction($b) {
	$a = 30;
	
	global $a, $c;
	return $c = ($b + $a);
}

print myfunction(40) + $c;

?>
</code>output:<code>
120
</code>
==== Class and Object ====
<code php>
<?php

class ClassOne {
  protected $a = 10;

  public function changeValue($b) {
    $this->a = $b;
  }
}

class ClassTwo extends ClassOne {

  protected $b = 10;

  public function changeValue($b) {
    $this->b = 10;
    parent::changeValue($this->a + $this->b);
  }

  public function displayValues() {
    print "a: {$this->a}, b: {$this->b}\n";
  }
}

$obj = new ClassTwo();

$obj->changeValue(20);
$obj->changeValue(10);

$obj->displayValues();

?>
</code>output:<code>
a: 30, b: 10
</code>
===== Send mail with PHP =====
==== php code ====
<code php>
<?php
$subject = 'We Have Received Your Article';
$fromEmail = 'sale@babies.vn';
$fromName = 'shop babies.vn';
$toEmail = 'anh.vochi@gmail.com';
$toName = 'Anh Vo';
$message= <<<EMAIL
Hi $toName!
 
I just wanted to notify you and let you know that I received your article and it will be reviewed shortly.
 
 
 
Regards,
Douglas Brown
EMAIL;
mail($toEmail,$subject,$message,"From: $fromEmail\n");
?>
</code>
==== understand php email ====
=== email log: /var/log/maillog ===
[/var/log/maillog]
<code>
May 23 09:03:59 mail postfix/pickup[3000]: 12F4E40A83: uid=48 from=<apache>
May 23 09:03:59 mail postfix/cleanup[3188]: 12F4E40A83: message-id=<20140523020359.12F4E40A83@mail.babies.vn>
May 23 09:03:59 mail postfix/qmgr[1174]: 12F4E40A83: from=<apache@babies.vn>, size=569, nrcpt=1 (queue active)
May 23 09:03:59 mail postfix/smtp[3190]: connect to gmail-smtp-in.l.google.com[2607:f8b0:400e:c03::1a]:25: Network is unreachable
May 23 09:04:01 mail postfix/smtp[3190]: 12F4E40A83: to=<anh.vochi@gmail.com>, relay=gmail-smtp-in.l.google.com[74.125.25.26]:25, delay=2.2, delays=0.07/0/0.67/1.5, dsn=2.0.0, status=sent (250 2.0.0 OK 1400810645 xp1si1843220pab.44 - gsmtp)
May 23 09:04:01 mail postfix/qmgr[1174]: 12F4E40A83: removed
</code>
=> webserver apache use local account apache to send email
  May 23 09:03:59 mail postfix/qmgr[1174]: 12F4E40A83: from=<apache@babies.vn>, size=569, nrcpt=1 (queue active)

=== Solve problem: error log in sendmail ===
Sometime occur error below:
<code>
[Fri May 23 09:44:40 2014] [error] [client 115.73.56.43] PHP Warning:  mail(): Could not execute mail delivery program '/usr/sbin/sendmail -t -i' in testemail.php on line 17
</code>
=> Not enough memory for sending email



===== connect database with php_mysql =====
  * Simple Connect<code php>
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>
</code>
  * Connect and query drupal database<code php>
<?php
$link = mysql_connect('localhost', 'admin', 'admin12!@');
if (!$link) {
  die('Could not connect: ' . mysql_error());
}
if (!mysql_select_db('drupal')) {
  die('Could not select database: ' . mysql_error());
}
$result = mysql_query('SELECT * FROM drupal.users');
if (!$result) {
    die('Could not query:' . mysql_error());
}
echo "first";
if(mysql_num_rows($result)>0)
{
  mysql_data_seek($result,0);
}
while($row = mysql_fetch_array($result))
{
  var_dump($row);
}
mysql_close($link);
?></code>
===== check connect database with pdo_mysql =====
<code php>
<?php
$hostname = "localhost";
$username = "root";
$dbname = "tendatabase";
$password = "opLHghz9CkQ8FM";

try {
    $dbh = new PDO("mysql:host=$hostname;dbname=$dbname", $username, $password);
    echo "Connected to database"; // check for connection
    }
catch(PDOException $e)
    {
    echo $e->getMessage();
    }
?>
</code>
===== Create seo link with php =====
<code php>
<?php
function vietnamese_permalink ($title, $replacement = '-')
{
		/* 	Replace with "-"
		*/
		//$replacement = '-';
		$map = array ();
		$quotedReplacement = preg_quote( $replacement, '/' );
		$default = array (
						'/à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ|À|Á|Ạ|Ả|Ã|Â|Ầ|Ấ|Ậ|Ẩ|Ẫ|Ă|Ằ|Ắ|Ặ|Ẳ|Ẵ|å/' => 'a',
						'/è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ|È|É|Ẹ|Ẻ|Ẽ|Ê|Ề|Ế|Ệ|Ể|Ễ|ë/' => 'e',
						'/ì|í|ị|ỉ|ĩ|Ì|Í|Ị|Ỉ|Ĩ|î/' => 'i',						'/ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ|Ò|Ó|Ọ|Ỏ|Õ|Ô|Ồ|Ố|Ộ|Ổ|Ỗ|Ơ|Ờ|Ớ|Ợ|Ở|Ỡ|ø/' => 'o',
						'/ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ|Ù|Ú|Ụ|Ủ|Ũ|Ư|Ừ|Ứ|Ự|Ử|Ữ|ů|û/' => 'u',
						'/ỳ|ý|ỵ|ỷ|ỹ|Ỳ|Ý|Ỵ|Ỷ|Ỹ/' => 'y',
						'/đ|Đ/' => 'd',
						'/ç/' => 'c',
						'/ñ/' => 'n',
						'/ä|æ/' => 'ae',
						'/ö/' => 'oe',
						'/ü/' => 'ue',
						'/Ä/' => 'Ae',
						'/Ü/' => 'Ue',
						'/Ö/' => 'Oe',
						'/ß/' => 'ss',
						'/[^\s\p{Ll}\p{Lm}\p{Lo}\p{Lt}\p{Lu}\p{Nd}]/mu' => ' ',
						'/\\s+/' => $replacement,
						sprintf( '/^[%s]+|[%s]+$/', $quotedReplacement, $quotedReplacement ) => ''
		);
		//Some URL was encode, decode first
		$title = urldecode( $title );
		$map = array_merge( $map, $default );
		return strtolower( preg_replace( array_keys( $map ), array_values( $map ), $title ) );
}
$str = 'Rượu bàu đá';
$seolink = vietnamese_permalink($str);
echo $seolink;
?>
</code> => output:<code>
ruou-bau-da
</code>
===== Read XML with PHP =====
refer: http://php.net/manual/en/book.xml.php
==== SimpleXMLElement ====
refer: 
  * http://php.net/manual/en/class.simplexmlelement.php
  * http://sg2.php.net/manual/en/simplexml.examples-basic.php
=== Read xml file to object SimpleXMLElement ===
refer: http://php.net/manual/en/function.simplexml-load-file.php
<code php>
<?php
// The file test.xml contains an XML document with a root element
// and at least an element /[root]/title.

if (file_exists('test.xml')) {
    $xml = simplexml_load_file('test.xml');
 
    print_r($xml);
} else {
    exit('Failed to open test.xml.');
}
?>
</code>
=== Read xml string to SimpleXMLElement ===
SimpleXMLElement is JSON Object

  * First We create **example.php** file with the xml content:<code php>
<?php
$xmlstr = <<<XML
<?xml version='1.0' standalone='yes'?>
<movies>
 <movie>
  <title>PHP: Behind the Parser</title>
  <characters>
   <character>
    <name>Ms. Coder</name>
    <actor>Onlivia Actora</actor>
   </character>
   <character>
    <name>Mr. Coder</name>
    <actor>El Act&#211;r</actor>
   </character>
  </characters>
  <plot>
   So, this language. It's like, a programming language. Or is it a
   scripting language? All is revealed in this thrilling horror spoof
   of a documentary.
  </plot>
  <great-lines>
   <line>PHP solves all my web problems</line>
  </great-lines>
  <rating type="thumbs">7</rating>
  <rating type="stars">5</rating>
 </movie>
</movies>
XML;
?>
</code>
  * Next we convert the xml content to SimpleXMLElement and access content of it:<code php>
<?php
include 'example.php';

$movies = new SimpleXMLElement($xmlstr);

echo $movies->movie[0]->plot;
?>
</code>
=== Modify SimpleXMLElement Object and save xml content to file ===
<code php>
<?php
include 'example.php';
 
$movies = new SimpleXMLElement($xmlstr);
 
echo $movies->movie[0]->plot;
$movies->asXML('test.xml');
?>
</code>
==== DOM ====
===== Create Google Analytics Code for website =====
refer: https://support.google.com/analytics/?hl=en&rd=1#topic=1726911

==== Add an account to your Analytics Account ====

You need to have edit permission to add accounts to an existing Google Analytics Account.

To create a new account level in an existing Google Analytics Account:

  - Sign in to [[https://www.google.com/analytics/web/|your Google Analytics Account]]. 
  - Click **Admin** in the menu bar at the top of any page.
  - From the dropdown in Account column, click **Create new account**.

==== Add a property ====

Properties are where you send data and set up reporting views
Only users with edit permission can add a property to a Google Analytics account.

To set up a property:

  - Sign in to [[https://www.google.com/analytics/web/|your Google Analytics Account]]. 
  - Click **Admin** in the menu bar at the top of any page.
  - In the Account column, select the account from the dropdown that you want to add the property to.//If you have a lot of accounts, use the search box to help you find the right one//.
  - In the dropdown in the Property column, click **Create new property**.
===== Facebook Integration =====
==== Basic Steps To Integrate Facebook ====
refer: 
  * Docs: https://developers.facebook.com/docs/plugins?locale=vi_VN
  * Facebook comments: https://developers.facebook.com/tools/comments
Steps to integrate with facebook:
  - Step1: Before Integrate with facebook, we need to signin facebook, then go to link https://developers.facebook.com/ and create the Your Application. Facebook will create **AppID and AppSecret** to identify the your application. We will use these informations to integrate login, like, share, comments...and manage theme
  - Step2: Go to link https://developers.facebook.com/docs/plugins?locale=vi_VN to get code for each  features integrated. Below are basic template code for integrate like, share and comment:
    * Load Facebook javascript base on AppID<code javascript>
<script>
  window.fbAsyncInit = function() {
    FB.init({
      appId      : '1471852209797861',
      xfbml      : true,
      version    : 'v2.4'
    });
  };

  (function(d, s, id){
     var js, fjs = d.getElementsByTagName(s)[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement(s); js.id = id;
     js.src = "//connect.facebook.net/vi_VN/sdk.js";
     fjs.parentNode.insertBefore(js, fjs);
   }(document, 'script', 'facebook-jssdk'));
</script>
</code>
    * Update template to display button like <code html>
<div
  class="fb-like"
  data-share="false"
  data-width="450"
  data-show-faces="true">
</div>
</code>
    * update template to display button share simple:<code html>
<div class="fb-share-button" data-href="<?php echo $_product->getProductUrl(); ?>" data-layout="button_count"></div>
</code>
    * update template to display comment box:<code html>
<div class="fb-comments" data-href="<?php echo $_product->getProductUrl(); ?>" data-numposts="5"></div>
</code>
  - Step3: Update layout display of buttons follow link https://developers.facebook.com/docs/plugins/like-button?locale=vi_VN#faqlayout
==== Facebook Fanpage Box ====
Go to link https://developers.facebook.com/docs/plugins/page-plugin to config and create HTML code:<code html>
<div class="fb-page" data-href="https://www.facebook.com/ShopBabiesVn/" data-small-header="false" data-adapt-container-width="true" data-hide-cover="false" data-show-facepile="true"><blockquote cite="https://www.facebook.com/ShopBabiesVn/" class="fb-xfbml-parse-ignore"><a href="https://www.facebook.com/ShopBabiesVn/">Shop Babies VN</a></blockquote></div>
</code> => In case you have created other facebook integration, you **don't need to add javascript code** which generated by generate tool above
==== Facebook share Custom ====
refer: https://developers.facebook.com/docs/sharing/web
  - Step1: Create [[https://developers.facebook.com/docs/sharing/webmasters#markup|Open Graph Tag]] => **Facebook Crawler** will use internal heuristics to make a **best guess about the title, description, and preview image** for your content. So we need to check the **share on real website** for facebook crawl the data exactly
  - Step2: Go to link https://developers.facebook.com/tools/debug/ and enter the link  of your website to check Open Graph Tag -> we need fix all errors when debug with this tool. With old pages,facebook has cached informations on this page, so the facebook will not recognize the Open Graph Tag update with new image. Therefore, we must use debug tools to refresh these caches -> Fix error can't comment and share missing the image(Click **Fetch New Scrape Information** 3 times to get new information). Or  wait patiently for **every 30 days to ensure the properties are up to date** as it says in documentation https://developers.facebook.com/docs/plugins/like-button
==== Manage Facebook Comments(moderation tool) ====
refer: 
  * new API v3.1: https://developers.facebook.com/docs/graph-api/reference/v3.1/comment
  * Docs: https://developers.facebook.com/docs/plugins/comments#moderation-setup
  * Moderation tool:https://developers.facebook.com/tools/comments