if we have 5 different array how to merge them in single array in php -

i have 5 different array structure :-

array ( [0] => http://www.php.net/200 ) array ( [0] => http://www.php.net/?setbeta=1&beta=1302 )  array ( [0] => http://www.php.net/downloads.php200 )  array ( [0] => http://www.php.net/docs.php200 ) array ( [0] => http://www.php.net/faq.php302 ) 

i need merge these in single array structure like:-

array ( [0] => http://www.php.net/200          [1] => http://www.php.net/?setbeta=1&beta=1302          [2] => http://www.php.net/downloads.php200          [3] => http://www.php.net/docs.php200          [4] => http://www.php.net/faq.php302     ) 

one thing want confirm these arrays forming inside loop function , of number , have single name i.e $array

use array_merge.

$arr = array_merge($arr1,$arr2,$arr3,$arr4,$arr5); 

edit after seeing comment, having multidimensional array.

$arr = array(); for($i = 0; $i < $old_arr; $i++) {     $arr[] = $old_arr[$i][0]; }