push generates error

<?php
$arrFirst = array("liquor_type","varietal","bottle_region","distributor");
$arrLast = array("smith","jones","parker");

$arrFirst_text = array("wine_quantity","wine_price");
$arrLast_text = array("smith","jones","parker");

//$arr_mysql=array_push($arrFirst,$arrFirst_text);
$arr_mysql=array("liquor_type","varietal","bottle_region","distributor","wine_quantity","wine_price");

foreach ($arr_mysql as &$tablename) {
  echo '<br>'.$tablename;
}  

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works

but when I use push
$arr_mysql=array_push($arrFirst,$arrFirst_text);

no output and warning
Warning: Invalid argument supplied for foreach() in C:\Users\Acer\Documents\NuSphere PhpED\Projects\noname162.php on line 11