what's new in php 7

null-coalesce-operator.php

<?php
  if(isset($_GET['name'])) {
    $name = $_GET{'name'];
  }
  else {
    $name = '(unknown)';
  }
   
  //Other option to get name
   $name = $_GET['name'] ?: '(unknown)';
   
   //there is a trouble if name is not set in the url
   echo htmlspecialchars($name);
    
   //Coalesce it's kind of like a ternary operator, but it checks for isset
   $name = $_GET['name'] ?? '(unknown)';
   

spaceship_or_combinedComparisonOperator

<?php
//if the first operant is less than the second one, we get -1,
//if the first operant is larger than the second one, we get 1,
//if both operant are the same, we get 0

  $orderNumbers = [1, 4, 7, 34 ];
  usort($orderNumber, function($p1, $p2) {
   return $p1 <=> $p2;
  });
  
  var_dump($orderNumbers);

splat_or_rest_ operator

<?php
  //all args pass to AddItems will be in the array $items
  function AddItemsToBasket(...$items) {
    var_dump($items);
  }

  AddItemsToBasket('A', 'B', 'C');

type-declarations.php

<?php
  declare(strict_types=1);

  function calcTotal (float $price, float $shipping) :float {
    return $price + $shipping;
  }

  //Type error because first param is a string 
  $calcTotal = calcTotal('1.23', 4.56);

  var_dump($calcTotal);