standardize php builtin functions

Hello Internals, PHP has built in functions for string, array and math etc. But some string and array functions start with Str_* and array_* but not all. If we standardize php builtin functions so all string functions start with str_*, and all array functions start with array_* and all math functions start with math_*, it will provide a lot of help to PHP developers. If we are using VS Code, Sublime text, PHPStorm etc, developers will simply write str_ or array_ or math_ and IntelliSensewill popup all string, array and math functions. There will be no BC break, because math_floor() will be an alias of floor() and array_asort() will be an alias of asort(), file_basename will be an alias of basename(). - Prefix reaming string functions with str_* - Prefix reaming array functions with array_* - Prefix math functions with math_* - Prefix file functions with file_*