Composer without PHP-CLI

putenv("HOME=".getcwd());

copy('https://getcomposer.org/installer', 'composer-setup.php');
exec("/usr/local/php7.3/bin/php composer-setup.php 2>&1",$x);

if (is_file("composer-setup.php"))
{
$m=exec("/usr/local/php7.3/bin/php -d memory_limit=384M composer.phar require monolog/monolog 2>&1",$x);
}
else
{
echo "Download error";
}
print_r($m);
print_r($x);