pcntl_exec

(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 = []): false

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.
env_vars: 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.

Returns false.