Does PHP Treat Function Names Case-Sensitively?

Are PHP Function Names Case Sensitive?

In PHP, the case sensitivity of function names has been a subject of debate. While some may recall hearing that PHP function names are case-insensitive, let's delve into the official documentation for clarification.

According to the PHP manual:

"Function names are case-insensitive, though it is usually good form to call functions as they appear in their declaration."

Therefore, it can be concluded that PHP function names are indeed case-insensitive. This means that calling a function like my_function and MY_FUNCTION will yield the same result.

However, it's considered good programming practice to follow the case of the function name as it appears in its declaration. This enhances code readability and maintains consistency throughout the codebase.

Regarding the history of PHP function case sensitivity, there was a proposal during the development of PHP5 to make function and object names case-sensitive. However, this proposal did not gain enough support and was ultimately not implemented. As a result, PHP function names remain case-insensitive to this day.

The above is the detailed content of Does PHP Treat Function Names Case-Sensitively?. For more information, please follow other related articles on the PHP Chinese website!