这么获取数组值？

array(100) {
  [0] => string(3) "1_1"
  [1] => string(3) "2_1"
  [2] => string(3) "2_2"
  [3] => string(3) "3_1"
  [4] => string(3) "3_2"
  [5] => string(3) "3_3"
  .....
}


输入"3_"就得
array(3) {
  ["0"] => string(1) "1"
  ["1"] => string(1) "2"
  ["2"] => string(1) "3"
请问这么取？

回复讨论(解决方案)

$data =array("1_1","2_1","2_2","3_1","3_2","3_3");$need="3_";$ret = array_filter($data,function($item) use($need){	return strpos($item,$need) === 0;});var_dump($ret);

$d = array(  "1_1",  "2_1",  "2_2",  "3_1",  "3_2",  "3_3",);$in = '3_';$out = array_values(  array_map(function($s) use (&$in) {    return substr($s, strlen($in));  }, preg_grep("/$in/", $d)));print_r($out);

Array(    [0] => 1    [1] => 2    [2] => 3)

$data =array("1_1","2_1","2_2","3_1","3_2","3_3");$need="3_";$ret = array_filter($data,function($item) use($need){	return strpos($item,$need) === 0;});var_dump($ret);