Popisvoid pcntl_exec ( string path [, array args [, array envs]] )
Executes the program with the given arguments.
pathmust 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.
argsis an array of argument strings passed to the program.
envsis 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.