pcntl_exec

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

pcntl_exec — Executes specified program in current process space

pcntl_exec ( string $path [, array $args [, array $envs ]] ) : void

Executes the program with the given arguments.

path: 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: args is an array of argument strings passed to the program.
envs: envs 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.

Returns NULL on success or FALSE on failure.

Php/docs/function.pcntl-exec