获取命令的返回值

Question

I've found many ways to run a command, like exec,system,shell_exec, but they all seem to return the command output.

I want only the return value (integer).

How can I do that?

<?php
$retval = something("script.sh");

Answer 1

You can use exec()

exec("command", $output, $retval);
echo "output: $output
";
echo "return value: $retval
";

exec() consumes $output and $retval by reference and their values will be set inside of exec(). Check the manual of exec() again.

Btw, $output and $retval will get implicitly initialized, they don't need to exist before the exec() call.