What is the main difference between require() and require_once()?

  • The require() function includes a file and re-executes its content every time it is called, while the require_once() function includes a file only once, regardless of how many times it is called.
  • The require() function includes a file only once, regardless of how many times it is called, while the require_once() function includes a file and re-executes its content every time it is called.
  • The require() function and the require_once() function are the same and can be used interchangeably.
  • The require() function and the require_once() function both include a file and re-execute its content every time they are called.
The main difference between require() and require_once() functions is in how they include and execute a file. - The require() function includes a file and re-executes its content every time it is called. If the same file is included multiple times, it will be re-executed each time. - The require_once() function includes a file only once, regardless of how many times it is called. It ensures that the file is included and its content is executed only once, even if it is referenced multiple times in the code. This is useful when including files that define functions or classes to prevent redeclaration errors. By using require_once(), you can ensure that the included file is executed only once, avoiding potential conflicts or duplicate declarations.
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