{"id":27463,"date":"2017-03-27T13:58:01","date_gmt":"2017-03-27T11:58:01","guid":{"rendered":"https:\/\/mamchenkov.net\/wordpress\/?p=27463"},"modified":"2017-03-27T13:58:01","modified_gmt":"2017-03-27T11:58:01","slug":"creating-strictly-typed-arrays-collections-php","status":"publish","type":"post","link":"https:\/\/mamchenkov.net\/wordpress\/2017\/03\/27\/creating-strictly-typed-arrays-collections-php\/","title":{"rendered":"Creating Strictly Typed Arrays and Collections in PHP"},"content":{"rendered":"\n

This SitePoint PHP blog post<\/a>\u00a0(read at Planet PHP<\/a> if the site is unavailable) brings to light a very useful feature available since PHP 5.6 – ellipses in functional arguments<\/a>, which allows to define a variable number of arguments to a function.<\/p>\n

I’ve seen the mentions of ellipses a few times now, but I assumed that it was a PHP 7 feature. \u00a0Turns out PHP 5.6 users can enjoy it as well:<\/p>\n

\r\n<?php\r\nfunction sum(...$numbers) {\r\n    $acc = 0;\r\n    foreach ($numbers as $n) {\r\n        $acc += $n; \r\n    }   \r\n    return $acc;\r\n}\r\necho sum(1, 2, 3, 4); \/\/ prints out 10\r\n<\/pre>\n
This is very useful, but, as SitePoint PHP blog most mentions, it can be made even more useful with type hinting of the arguments. \u00a0For example:<\/p>\n
\r\n<?php \r\nclass Movie { private $dates = [];\r\n    public function setAirDates(\\DateTimeImmutable ...$dates) { \r\n        $this->dates = $dates;\r\n    }   \r\n\r\n    public function getAirDates() {\r\n        return $this->dates;\r\n    }   \r\n}\r\n<\/pre>\n
The limitation is that you can only hint a single type for all the arguments. The workaround this is to use collection classes, which basically work as strictly typed arrays.<\/p>\n\n","protected":false},"excerpt":{"rendered":"\n
This SitePoint PHP blog post\u00a0(read at Planet PHP if the site is unavailable) brings to light a very useful feature available since PHP 5.6 – ellipses in functional arguments, which allows to define a variable number of arguments to a function. I’ve seen the mentions of ellipses a few times now, but I assumed that … Continue reading Creating Strictly Typed Arrays and Collections in PHP<\/span><\/a><\/p>\n\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Creating Strictly Typed Arrays and Collections in PHP #WebDev #PHP","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false,"_links_to":"","_links_to_target":""},"categories":[1,18,62,1334],"tags":[38,1330],"keyring_services":[],"class_list":["post-27463","post","type-post","status-publish","format-standard","hentry","category-general","category-programming","category-technology","category-web-work","tag-php","tag-web-development"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":27105,"url":"https:\/\/mamchenkov.net\/wordpress\/2016\/12\/11\/php-static-analysis-tool-discover-bugs-in-your-code-without-running-it\/","url_meta":{"origin":27463,"position":0},"title":"PHP Static Analysis Tool – discover bugs in your code without running it!","author":"Leonid Mamchenkov","date":"December 11, 2016","format":false,"excerpt":"Ond\u0159ej Mirtes shares the idea behind the creation of\u00a0PHPStan - a static analysis tool for PHP: Compiled languages need to know about the type of every variable, return type of every method etc. before the program runs. 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