问使php可以访问shell zip

EN

  if(function_exists('shell_exec')) {
        echo "exec is enabled";
    }

if(shell_exec('echo foobar') == 'foobar'){
    echo 'shell_exec works';
}

 // Exec function exists.
    // Exec is not disabled.
    // Safe Mode is not on.
    $exec_enabled =
       function_exists('exec') &&
       !in_array('exec', array_map('trim', explode(', ', ini_get('disable_functions')))) &&
       strtolower(ini_get('safe_mode')) != 1
    ;


    if($exec_enabled) { exec('blah'); }

// helper function
function checkShellCommand($command) {
    $returnValue = shell_exec("$command");
    if(empty($returnValue)) {
        return false;
    } else {
        return true;
    }
}

// test the shell command you'd like to use
if (!checkShellCommand('uname -a')) {
    print 'This command cannot be executed.';
} else {
    echo shell_exec('uname -a');
}