Run "cowsay -f" command randomly on PHP.

rand_cowsay.php

<?php

if (count($argv) < 2)
{
    echo 'parameter not enough.'."\n";
    return false;
}

exec('which cowsay 2>&1', $cmd_t);
if (!isset($cmd_t[0]) || $cmd_t[0] == '')
{
    echo 'cowsay not found.'."\n";
    return false;
}

$argv = array_reverse($argv);
$txt = $argv[0];
$cmd = $cmd_t[0];
if (in_array('-t', $argv))
{
    $cmd = str_replace('cowsay', 'cowthink', $cmd);
}

$c = [];
exec(sprintf('%s -l 2>&1', $cmd), $cl);
foreach ($cl as $k => $l)
{
    if ($k === 0)
    {
      continue;
    }
    $c = array_merge($c, explode(' ', $l));
}

$idx = rand(1,count($c)) - 1;
exec(sprintf('%s -f %s "%s"', $cmd, $c[$idx], $txt), $res);
foreach ($res as $r)
{
    echo $r."\n";
}
echo "\n\nby {$c[$idx]}\n";