Are PHP Function Names Case Sensitive?

PHP Function Case Sensitivity

While exploring code, you may encounter instances where functions like "mySQL_fetch_array" are invoked. It's imperative to ascertain whether PHP functions are case sensitive, as understanding this concept can significantly impact code functionality.

Case Sensitivity of Function Names

According to PHP documentation, function names are not case sensitive. This implies that you can call a function using any combination of uppercase and lowercase letters without affecting its behavior. For example, "mySQL_fetch_array" and "mysql_fetch_array" are both valid ways of invoking the same function.

Coding Conventions

Although function names are not case sensitive, it's considered good practice to adhere to naming conventions. This helps maintain a consistent and readable coding style. Typically, PHP functions and objects are written in lowercase, with individual words connected by underscores. By following this convention, code readability is enhanced, and potential confusion due to conflicting case usage is minimized.

Historical Perspective

In earlier versions of PHP, functions were case-insensitive by default. However, there was a proposal to introduce case sensitivity for functions and objects in PHP5. This proposal was eventually rejected, and function name case insensitivity remains a cornerstone of PHP functionality.

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