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// show php errors
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);

// var dump
print '<pre>';
var_dump(get_defined_vars()); 
print '</pre>';

// devel vars
dpm(get_defined_vars());

// devel form data
dpm($form_id);
dpm($form);
dpm($form_state);