[Process] PhpProcess constructor arguments

[Guikingone]

Symfony version(s) affected: master

Description
Using the PhpProcess::fromShellCommandline() method and passing a simple string echo Symfony, it seems that PhpProcess constructor requires a string, by default, the fromShellCommandline implementation depends on the Process one which requires an array as the first argument.

How to reproduce
Just try to instantiante PhpProcess::fromShellCommandline() with a string echo Symfony.

Possible Solution

#35641

Additional context
As far as I can see, it seems that the error occurs here:

$process = new static([], $cwd, $env, $input, $timeout);
$process->commandline = $command;

return $process;

PhpProcess receive an array as the first argument 🤔