Pasted

<?php
 
    echo "passthru()" . PHP_EOL;
    passthru("ls");
 
    echo PHP_EOL;
    echo "exec()" . PHP_EOL;
    $output = '';
    $last_line = exec("ls", $output);
    echo implode(PHP_EOL, $output) . PHP_EOL;
 
    echo PHP_EOL;
    echo "shell_exec()" . PHP_EOL;
    echo shell_exec("ls");
 
    echo PHP_EOL;
    echo "system()" . PHP_EOL;
    $last_line = system("ls");
 
    echo PHP_EOL;
    echo "popen()" . PHP_EOL;
    $p = popen("ls", "r");
    while(!feof($p))
    {
        echo fread($p, 1024);
    }
    pclose($p);
 
    echo PHP_EOL;
    echo "proc_open()" . PHP_EOL;
    $pipe_descriptions = array(array("pipe", "r"), array("pipe", "w"), array("pipe", "r"));
    $p = proc_open("ls", $pipe_descriptions, $pipes);
    fclose($pipes[0]);
    while(!feof($pipes[1]))
    {
        echo fread($pipes[1], 1024);
    }
    fclose($pipes[1]);
    fclose($pipes[2]);
    proc_close($p);