// Displays the trace to the function call location
debug();
// Displays the contents of a single variable
debug($_POST);
// Displays the contents of multiple variables
debug($_GET, $_POST, ...);
fastcgi_param PHP_VALUE "auto_prepend_file=/path_to/debug.php";
php_value auto_prepend_file "/path_to/debug.php"
mkdir -p ~/.php.d
echo 'auto_prepend_file=/path_to/debug.php' >> ~/.php.d/php.ini
echo 'export PHP_INI_SCAN_DIR=:~/.php.d' >> ~/.bashrc