Require_once

Description: The require_once statement in PHP is an instruction that allows including a file in a script, ensuring that the file is loaded only once during the program’s execution. This is particularly useful to avoid issues of redeclaration of functions, classes, or variables that may arise if a file is included multiple times. When using require_once, the PHP interpreter checks if the file has already been included; if so, it does not reload it, optimizing performance and preventing errors. This feature is fundamental in web application development, where modularity and code reuse are common practices. The statement is part of PHP’s inclusion instructions, which also include require, include, and include_once, each with its own particularities and uses. In summary, require_once is an essential tool for developers looking to keep their code clean, efficient, and conflict-free.

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