{"id":2060,"date":"2016-03-20T18:00:00","date_gmt":"2016-03-21T01:00:00","guid":{"rendered":"https:\/\/www.virendrachandak.com\/techtalk\/?p=2060"},"modified":"2016-03-26T15:00:10","modified_gmt":"2016-03-26T22:00:10","slug":"php-7-combined-comparison-spaceship-operator","status":"publish","type":"post","link":"https:\/\/www.virendrachandak.com\/techtalk\/php-7-combined-comparison-spaceship-operator\/","title":{"rendered":"PHP 7 – Combined Comparison (Spaceship) Operator"},"content":{"rendered":"

In this post we will take a look and another new operator in PHP 7. This operator is the Combined Comparison or Spaceship operator (<=><\/code>). This operator is a three way comparison operator. It will do greater-than, less-than and equal comparisons between two operands. <\/p>\n

The spaceship operator (<=><\/code>) returns -1 if the left side is smaller, 0 if the values are equal and 1 if the left side is larger. It can be used on all generic PHP values with the same semantics as < , <=, ==, >=, >. This operator is similar in behavior to strcmp() or version_compare(). This operator can be used with integers, floats, strings, arrays, objects, etc.
\n
\nExample usage:<\/p>\n

\r\n$c = $a <=> $b;\r\n\/\/ This is equivalent to\r\n$c = ($a < $b) ? -1 : (($a > $b) ? 1 : 0);\r\n<\/pre>\n
Here are a few more examples from PHP RFP for Combined Comparison (Spaceship) Operator<\/a><\/p>\n
\r\n\/\/ Integers\r\necho 1 <=> 1; \/\/ 0\r\necho 1 <=> 2; \/\/ -1\r\necho 2 <=> 1; \/\/ 1\r\n \r\n\/\/ Floats\r\necho 1.5 <=> 1.5; \/\/ 0\r\necho 1.5 <=> 2.5; \/\/ -1\r\necho 2.5 <=> 1.5; \/\/ 1\r\n \r\n\/\/ Strings\r\necho "a" <=> "a"; \/\/ 0\r\necho "a" <=> "b"; \/\/ -1\r\necho "b" <=> "a"; \/\/ 1\r\n \r\necho "a" <=> "aa"; \/\/ -1\r\necho "zz" <=> "aa"; \/\/ 1\r\n \r\n\/\/ Arrays\r\necho [] <=> []; \/\/ 0\r\necho [1, 2, 3] <=> [1, 2, 3]; \/\/ 0\r\necho [1, 2, 3] <=> []; \/\/ 1\r\necho [1, 2, 3] <=> [1, 2, 1]; \/\/ 1\r\necho [1, 2, 3] <=> [1, 2, 4]; \/\/ -1\r\n \r\n\/\/ Objects\r\n$a = (object) ["a" => "<span class="hiddenGrammarError" pre=""><span class="hiddenGrammarError" pre="">b"]; \r\n$b<\/span><\/span> = (object) ["a" => "b"]; \r\necho $a <=> $b; \/\/ 0\r\n \r\n$a = (object) ["a" => "b"]; \r\n$b = (object) ["a" => "c"]; \r\necho $a <=> $b; \/\/ -1\r\n \r\n$a = (object) ["a" => "c"]; \r\n$b = (object) ["a" => "b"]; \r\necho $a <=> $b; \/\/ 1\r\n \r\n\/\/ only values are compared\r\n$a = (object) ["a" => "b"]; \r\n$b = (object) ["b" => "b"]; \r\necho $a <=> $b; \/\/ 0\r\n<\/pre>\n
More reading:
\nPHP RFP for Combined Comparison (Spaceship) Operator<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
In this post we will take a look and another new operator in PHP 7. This operator is the Combined Comparison or Spaceship operator (<=>). This operator is a three way comparison operator. It will do greater-than, less-than and equal comparisons between two operands. The spaceship operator (<=>) returns -1 if the left side is […]<\/p>\n","protected":false},"author":1,"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,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_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":"","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},"categories":[143],"tags":[149],"class_list":["post-2060","post","type-post","status-publish","format-standard","hentry","category-php","tag-php-7"],"yoast_head":"\nPHP 7 - 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