Tag Archives: PHP

PHP

Anonymous Functions

Leave a comment

An anonymous function is simply a function with no name.

Anonymous functions, also known as closures, allow the creation of functions which have no specified name. They are most useful as the value of callback parameters, but they have many other uses.

Anonymous functions are implemented using the Closure class.

  • Anonymous functions can be bound to objects
  • Methods bind() and bindTo() of the Closure object provide means to create closures with different binding and scope
  • Binding defines the value of $this and the scope for a closure

An anonymous function has no name so you would define it like this

// Anonymous function
 function () {
 return "PHP Codez";
 }

Anonymous function variable assignment

<?php
$greet = function($name)
{
 printf("Hello %s\r\n", $name);
};

$greet('Codez');
$greet('PHP');
?>
PHP

Lambda

Leave a comment

A Lambda is an anonymous function that can be assigned to a variable or passed to another function as an argument. If you are familiar with other programming languages like Javascript or Ruby, you will be very familiar with anonymous functions.

Because the function has no name, you can’t call it like a regular function. Instead you must either assign it to a variable or pass it to another function as an argument.

Lambdas are useful because they are throw away functions that you can use once. Often, you will need a function to do a job, but it doesn’t make sense to have it within the global scope or to even make it available as part of your code. Instead of having a function used once and then left lying around, you can use a Lambda instead.

Of course, you have been able to use the create_function function in PHP for a while now. This basically does the same job.

Magento

Magento 2 Create Yes No Attribute Programmatically

1 Comment

Here i am creating upgradeData script that will add custom product attribute with yes and no options.

<?php
 namespace PHPCodez\Subscription\Setup;

use Magento\Eav\Setup\EavSetup;
 use Magento\Eav\Setup\EavSetupFactory;
 use Magento\Framework\Setup\UpgradeDataInterface;
 use Magento\Framework\Setup\ModuleContextInterface;
 use Magento\Framework\Setup\ModuleDataSetupInterface;

class upgradeData implements UpgradeDataInterface {
 private $eavSetupFactory;
 protected $logger;

public function __construct(EavSetupFactory $eavSetupFactory,\Psr\Log\LoggerInterface $logger) {
 $this->eavSetupFactory = $eavSetupFactory;
 $this->logger = $logger;
 }

public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context) {
 if (version_compare($context->getVersion(), '0.0.8', '<=')) {
 
  $this->logger->info("System - upgrading module - removing product attribute - subscripion_product");
 $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
 $eavSetup->addAttribute(
 \Magento\Catalog\Model\Product::ENTITY,
 'subscripion_product',[
 'type' => 'text',
 'backend' => '',
 'frontend' => '',
 'label' => 'Enable Subscription',
 'input' => 'select',
 'class' => '',
 'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Boolean',
 'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
 'visible' => true,
 'required' => true,
 'user_defined' => false,
 'default' => '',
 'searchable' => false,
 'filterable' => false,
 'comparable' => false,
 'visible_on_front' => false,
 'used_in_product_listing' => true,
 'unique' => false,
 'apply_to' => ''
 ]
 );
 
 
 }
 }
 }