$str = "ほげ";
$int = 1;

$array[] = "hoge";
$array[] = "fuga";
$array[] = "piyo";
 
print $array[0];    // hoge
print $array[1];    // fuga
print $array[2];    // piyo

$array = array("hoge","fuga","piyo");

$array = explode(",", "hoge,fuga,piyo");    // exploder("区切り文字","文字列);