PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8
pcntl_exec - Executes specified program in current process space
pcntl_exec( string$path, [array$args = ], [array$env_vars = ] ): bool
Executes the program with the given arguments.
path must be the path to a binary executable or a script with a valid path pointing to an executable in the shebang ( #!/usr/local/bin/perl for example) as the first line. See your system's man execve(2) page for additional information.
args is an array of argument strings passed to the program.
env_vars is an array of strings which are passed as environment to the program. The array is in the format of name => value, the key being the name of the environmental variable and the value being the value of that variable.