Whereas type hints ensure input consistency, return type declarations ensure output consistency.
We use a colon before the opening curly brace of a function to hint the return type.
The same strictness rules apply as with the type hints: if “strict mode” is disabled, return values that can be converted to the preferred type are allowed. If you enable “strict mode” this code will throw a type error.
Type hints have been available in PHP for while now. Unfortunately they were restricted to classes, arrays and callables.
As of PHP 7, the scalar types (integers, floating point numbers, booleans and strings) can also be used as type hints.
it allows developers to ensure a better input consistency of a function/method interface. By default “coercive mode” is enabled. This restricts PHP from throwing a type error when the types don’t exactly match, but when a conversion is still possible.
If you enable “strict mode” , a type error is thrown when the signatures don’t match.
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.
Run the following command to see if php-fpm is running
netstat -pl | grep php-fpm.sock
Run the following command s in the given order
yum -y update yum -y install epel-release yum install -y http://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release-1.0-14.ius.centos7.noarch.rpm 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
Issue the following command
php -me[mail function]
SMTP = mymailserver.example.como 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.
<?php
class Customer {
private $name;
public function setName($name) {
$this->name = $name;
}
public function getName() {
return $this->name;
}
public function __clone() {
$c = new Customer();
$c->setName($this->name);
return $c;
}
}
$c1 = new Customer();
$c1->setName("phpcode");
$c2 = clone $c1;
$c2->setName("phpcodez");
echo $c1->getName()."\n";
echo $c2->getName()."\n";
?>