Difference Between Include Include Once - Latest Information & Updates 2026

Web Reference: Jul 23, 2025 · The include_once () function in PHP is mainly used to include one PHP file into another PHP file. It provides us with a feature that if a code from a PHP file is already included in a specified file then it will not include that code again. Use include_once() or require_once() when you want to include a file only once to avoid any issues with duplicate functions or variables. Note: In general, it is recommended to use require_once() over include_once() to ensure that the required file is included and not missing. Jan 25, 2026 · If you remember nothing else, remember this: include () is repeatable by design; include once () is defensive by design. When a file is included multiple times and it defines functions or classes, you will hit fatal errors like “Cannot redeclare class” or “Cannot redeclare function.”

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