Category Archives: PHP

Public interfaces

A public interface is a set of code that third-party developers can call, implement, or build as a plug-in. Magento guarantees that this code will not change in subsequent releases without a major version change.

Public interfaces for a module are marked with @api annotation.

Install PHP 7 Centos 7

Run the following command s in the given order

yum -y update

yum -y install epel-release

yum install -y

yum -y update

yum -y install php71u php71u-pdo php71u-mysqlnd php71u-opcache php71u-xml php71u-mcrypt php71u-gd php71u-devel php71u-mysql php71u-intl php71u-mbstring php71u-bcmath php71u-json php71u-iconv php71u-soap php71u-fpm  php71u-cli 

service httpd restart

php -v

Serializing Objects

o Functions: serialize() / unserialize()

o Magic method __sleep() is executed with serialization, if available o allows you to specify which properties should be stored (serialized) and which should not be stored

o Can also create/change properties for serialization

o Magic method __wakeup() is executed with deserialization, if available ex: to open a database connection unique to the object


Object cloning is creating a copy of an object. An object copy is created by using the clone keyword and the __clone() method cannot be called directly. In PHP, cloning an object is doing a shallow copy and not a deep copy. Meaning, the contained objects of the copied objects are not copied. If you wish for a deep copy, then you need to define the __clone() method.

When an object is cloned, PHP 5 will perform a shallow copy of all of the object’s properties. Any properties that are references to other variables will remain references.

Once the cloning is complete, if a __clone() method is defined, then the newly created object’s __clone() method will be called, to allow any necessary properties that need to be changed.

 class Customer {
 private $name;
 public function setName($name) {
 $this->name = $name;
 public function getName() {
 return $this->name;
 public function __clone() {
 $c = new Customer();
 return $c;
 $c1 = new Customer();
 $c2 = clone $c1;

 echo $c1->getName()."\n";
 echo $c2->getName()."\n";


Way of storing data in a browser to id / track a user . Create (set) cookies with the setcookie() or setrawcookie() function and It must be called before sending any output to browser .

It can delay script output using output buffering, to allow time to decide to set cookies or send headers

Setcookie() params are defined according to specifications:

  • $name=value string
  • $value=value string
  • $expire=date optional; default is session end
  • $path=path specifies urls in a domain for which cookie is valid
  • $domain=domain_name check on domain attributes of cookies against host internet domain name
  • $secure cookie only transmitted via secure channels (https); boolean
  • $httponly cookie only made accessible via http protocol, not javascript; boolean

Access with $_cookie or $_request superglobals . Cookie data from the client is automatically sent to $_cookie, if params of variables_order() include “c” (environment/get/post/cookie/server) . It will overwrite itself if name, path, domain, secure, and http_only are identical .

Cookies are part of the http header o as with sessions, multiple values can be assigned to an array and To assign all values to only one cookie, can use serialize() or implode() with first value


Way of collecting data online from user accessing a web site.

Form data automatically available to php scripts. Dots and spaces in variable names converted to underscores.

Form data can be made into an array using the following syntax <input name=”FormArray[]”> .

Group elements by assigning the same array name to different elements; can specify keys.

$_POST superglobal contains all POST data; paired with post method

$_GET superglobal contains all GET data and $_REQUEST is independent of data source, and merges information from sources like GET, POST, and COOKIES; usage is not recommended