php 7.0 require_once

(PHP 4, PHP 5, PHP 7). The require_once statement is identical to require except PHP will check if the file has already ...

php 7.0 require_once

(PHP 4, PHP 5, PHP 7). The require_once statement is identical to require except PHP will check if the file has already been included, and if so, not include ... , I think you have different include paths set in PHP5 and PHP7. Run get_include_path() and compare result for both PHP versions.

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php 7.0 require_once 相關參考資料
PHP require_once, include_once() statement - w3resource

PHP require_once() , include_once() statement can be used to include a php file in another one, whenyou may need to include the called file ...

https://www.w3resource.com

PHP: require_once - Manual

(PHP 4, PHP 5, PHP 7). The require_once statement is identical to require except PHP will check if the file has already been included, and if so, not include ...

http://php.net

require_once works in PHP 5.6 but not in PHP 7 - Stack Overflow

I think you have different include paths set in PHP5 and PHP7. Run get_include_path() and compare result for both PHP versions.

https://stackoverflow.com