{"id":262340,"date":"2020-08-05T15:08:48","date_gmt":"2020-08-05T15:08:48","guid":{"rendered":"https:\/\/webkul.com\/blog\/?p=262340"},"modified":"2020-08-06T05:50:13","modified_gmt":"2020-08-06T05:50:13","slug":"php-scalar-and-return-declarations","status":"publish","type":"post","link":"https:\/\/webkul.com\/blog\/php-scalar-and-return-declarations\/","title":{"rendered":"PHP Scalar and Return type Declarations"},"content":{"rendered":"\n

Hey, if you are looking into PHP scalar or return type declarations then you must read this post. These are the features that were introduced in PHP 7<\/p>\n\n\n\n

Now let’s look closely with examples.<\/p>\n\n\n\n

Scalar Type Declarations<\/strong><\/h2>\n\n\n\n

This type of declaration has two options coercive (default mode) and strict<\/p>\n\n\n\n

Coercive mode:<\/strong> it’s a default mode<\/p>\n\n\n\n

<?php\nclass Customer {\n  private $balance = 0;\n\n  public function setWalletBalance(int ...$values) {\n    $this->balance = array_sum($values);\n  }\n\n  public function getWalletBalance() {\n    return $this->balance;\n  }\n}\n$customer = new Customer();\n$registration_reward = "1000";\n$newsletter_reward = 100;\n\n$customer->setWalletBalance($registration_reward, $newsletter_reward);\n\necho "My total balance is " . $customer->getWalletBalance();<\/pre>\n\n\n\n
In the above example, it’s just a simple customer class and method setWalletBalance()<\/strong> uses scalar type declaration which will accept any number of values then make a sum and then set to property balance.<\/p>\n\n\n\n
If you just look into variables $registration_reward<\/strong> and $newsletter_reward<\/strong> have different data types so in coercive \/ default mode the program will output “My total balance is 1100” <\/strong>without any error.<\/p>\n\n\n\n
strict mode<\/strong><\/p><\/amp-fit-text>\n\n\n\n
<?php\ndeclare(strict_types=1);\nclass Customer {\n  private $balance = 0;\n\n  public function setWalletBalance(int ...$values) {\n    $this->balance = array_sum($values);\n  }\n\n  public function getWalletBalance() {\n    return $this->balance;\n  }\n}\n$customer = new Customer();\n$registration_reward = "1000";\n$newsletter_reward = 100;\n\n$customer->setWalletBalance($registration_reward, $newsletter_reward);\n\necho "My total balance is " . $customer->getWalletBalance();<\/pre>\n\n\n\n
In the above example, I just enabled strict mode on the very first line of my program so now you will get a fatal<\/p>\n\n\n\n
Return Type Declarations<\/strong><\/h2>\n\n\n\n
It specifies the type of value which will be returned from a function<\/p>\n\n\n\n
Default behavior: <\/strong><\/p>\n\n\n\n
<?php\nclass Customer {\n  private $address = '';\n\n  public function setAddress(string ...$values) {\n    $this->address = implode("\\n", $values);\n  }\n\n  public function hasAddress() : bool {\n    return $this->address;\n  }\n\n  public function getAddress() : string {\n    return $this->address;\n  }\n}\n$customer = new Customer();\n$name = "John Doe";\n$address = "Webkul arv park";\n$city = "Noida";\n$zone = "Uttar Pradesh";\n$country = "India";\n$customer->setAddress($name, $address, $city, $zone, $country);\n\nif($customer->hasAddress()) {\n  echo "My address is " . "<pre>" . $customer->getAddress() . "<\/pre>";\n} else {\n  echo "No address found";\n}<\/pre>\n\n\n\n
In the above example, I am just adding multiple values for an address using the scalar declaration<\/a> as we looked into the previous example. <\/p>\n\n\n\n
For method hasAddress()<\/strong>, it will return boolean value because the return type is bool but without any error then program output:<\/p>\n\n\n\n
\"output\"<\/figure>\n\n\n\n
 <\/p>\n\n\n\n
Strict mode: <\/strong><\/p>\n\n\n\n
<?php\ndeclare(strict_types=1);\nclass Customer {\n  private $address = '';\n\n  public function setAddress(string ...$values) {\n    $this->address = implode("\\n", $values);\n  }\n\n  public function hasAddress() : bool {\n    return $this->address;\n  }\n\n  public function getAddress() : string {\n    return $this->address;\n  }\n}\n$customer = new Customer();\n$name = "John Doe";\n$address = "Webkul arv park";\n$city = "Noida";\n$zone = "Uttar Pradesh";\n$country = "India";\n$customer->setAddress($name, $address, $city, $zone, $country);\n\nif($customer->hasAddress()) {\n  echo "My address is " . "<pre>" . $customer->getAddress() . "<\/pre>";\n} else {\n  echo "No address found";\n}<\/pre>\n\n\n\n
If you enable the strict mode as I did in the above example at the very first line of my program then it will give a fatal because hasAddress<\/strong>() method is set to return only boolean value and address property has the string value<\/p>\n\n\n\n
That’s it for this post, I hope it was helpful for you. visit more blogs here<\/a> and check other PHP 7 features on the official site here<\/a>. <\/p>\n\n\n\n
If you have any query then ask in the comment section. Thanks<\/p>\n","protected":false},"excerpt":{"rendered":"
Hey, if you are looking into PHP scalar or return type declarations then you must read this post. These are the features that were introduced in PHP 7 Now let’s look closely with examples. Scalar Type Declarations This type of declaration has two options coercive (default mode) and strict Coercive mode: it’s a default mode […]<\/a><\/p>\n","protected":false},"author":224,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[305,13,1],"tags":[2057],"class_list":["post-262340","post","type-post","status-publish","format-standard","hentry","category-opencart","category-php","category-uncategorized","tag-php"],"yoast_head":"\nPHP Scalar and Return type Declarations - Webkul Blog<\/title>\n<meta name=\"description\" content=\"PHP 7 features Scalar and Return type declarations which includes very simple examples to understand quickly\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/webkul.com\/blog\/php-scalar-and-return-declarations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PHP Scalar and Return type Declarations - 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