{"id":27340,"date":"2017-02-12T18:27:43","date_gmt":"2017-02-12T16:27:43","guid":{"rendered":"https:\/\/mamchenkov.net\/wordpress\/?p=27340"},"modified":"2017-02-12T18:27:43","modified_gmt":"2017-02-12T16:27:43","slug":"php-overwrite-of-built-in-constants-true-is-false","status":"publish","type":"post","link":"https:\/\/mamchenkov.net\/wordpress\/2017\/02\/12\/php-overwrite-of-built-in-constants-true-is-false\/","title":{"rendered":"PHP overwrite of built-in constants (true is false)"},"content":{"rendered":"\n

Here is a scary thing<\/a> I picked up on Reddit PHP<\/a>:<\/p>\n

\r\n<?php\r\nuse const true as false;\r\nif (false) {\r\n    echo "uh-oh";\r\n}\r\n<\/pre>\n
Until PHP 5.6 this was throwing a parse error, but from then on – it’s just fine. \u00a0Scary, right?<\/p>\n
The comments on the Reddit thread are quite helpful. \u00a0Technically, this is not overwriting (shadowing?) since the original constant is still available:<\/p>\n
\r\n<?php\r\nuse const true as false;\r\nif (\\false) {\r\n    echo "uh-oh";\r\n}\r\n<\/pre>\n
If you are a fan of nightmares, there is also this link<\/a>, which will shake your religious beliefs …<\/p>\n\n","protected":false},"excerpt":{"rendered":"\n
Here is a scary thing I picked up on Reddit PHP: <?php use const true as false; if (false) { echo "uh-oh"; } Until PHP 5.6 this was throwing a parse error, but from then on – it’s just fine. \u00a0Scary, right? The comments on the Reddit thread are quite helpful. \u00a0Technically, this is not … Continue reading PHP overwrite of built-in constants (true is false)<\/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":"PHP overwrite of built-in constants (true is false) #PHP #WebDev","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-27340","post","type-post","status-publish","format-standard","hentry","category-general","category-programming","category-technology","category-web-work","tag-php","tag-web-development"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t