{"id":8639,"date":"2022-09-14T18:03:30","date_gmt":"2022-09-14T12:33:30","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-what-is-the-difference-between-include-and-include_once-with-and-without-round-brackets\/"},"modified":"2022-09-14T18:03:30","modified_gmt":"2022-09-14T12:33:30","slug":"solved-what-is-the-difference-between-include-and-include_once-with-and-without-round-brackets","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-what-is-the-difference-between-include-and-include_once-with-and-without-round-brackets\/","title":{"rendered":"[Solved] What is the difference between include and include_once with and without round brackets"},"content":{"rendered":"

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The parentheses around the filename make no difference. include<\/code> is a language construct, not a function, so it doesn’t require parenthese around its arguments. So they’re equivalent, just like:<\/p>\n

echo \"foo\";\necho (\"foo\");\n<\/code><\/pre>\n
So there are just two forms: include<\/code> and include_once<\/code>. The difference between them is what happens if you try to include the same file multiple times in the same script. include<\/code> will include it each time, include_once<\/code> will only do it the first time, and ignore all the repeats.<\/p>\n
You generally use include<\/code> if the file performs some action, such as echoing HTML or setting variables. include_once<\/code> is used for files that define functions and classes, because these will get an error if you try to redefine them.<\/p>\n
If the file doesn’t exist, you’ll get warnings like this:<\/p>\n
\n
Warning: include(file.txt): failed to open stream: No such file or directory in \/path\/to\/your\/script.php on line 4
\n      Warning: include(): Failed opening ‘file.txt’ for inclusion (include_path=”.:”) in \/path\/to\/your\/script.php on line 4<\/p>\n<\/blockquote>\n
The warning is the same for include<\/code> and include_once<\/code>.<\/p>\n
There’s also require<\/code> and require_once<\/code>. They’re just like include<\/code> and include_once<\/code>, but instead of printing a warning if the file doesn’t exist, it prints an error and stops the script.<\/p>\n<\/p><\/div>\n
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            3<\/span> <\/p><\/div>\n<\/div>\n
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solved What is the difference between include and include_once with and without round brackets <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] The parentheses around the filename make no difference. include is a language construct, not a function, so it doesn’t require parenthese around its arguments. So they’re equivalent, just like: echo “foo”; echo (“foo”); So there are just two forms: include and include_once. The difference between them is what happens if you try to include … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[339],"class_list":["post-8639","post","type-post","status-publish","format-standard","hentry","category-solved","tag-php"],"yoast_head":"\n[Solved] What is the difference between include and include_once with and without round brackets - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-what-is-the-difference-between-include-and-include_once-with-and-without-round-brackets\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] What is the difference between include and include_once with and without round brackets - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The parentheses around the filename make no difference. include is a language construct, not a function, so it doesn’t require parenthese around its arguments. 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