php如何把数据库数据转成json格式，例如"phone":"123456"改为"name":"phone","value":"123456"

$s = '{"phone":"1234567"}';$a = json_decode($s, 1);foreach($a as $k=>$v) $r[] = array('name' => $k, 'value' => $v);echo json_encode($r);

$a = '{"phone":"1234567"}';$ret = array();$arr = json_decode($a, true); foreach($arr as $key=>$val){    array_push($ret, array('name'=>$key,'value'=>$val));}echo json_encode($ret);

$s="'phone':'1234567'";$arr=explode(':',$s);for($i=0;$i<sizeof($arr);$i++){    $item=array('name'=>current($arr),'value'=>next($arr));    break;}echo json_encode($item);

{"name":"'phone'","value":"'1234567'"}

$s = '{"phone":"1234567"}';$a = json_decode($s, 1);foreach($a as $k=>$v) $r[] = array('name' => $k, 'value' => $v);echo json_encode($r);

$sql ="select * from e_user where phone='18511337033'";$result = get_js_array($sql);$a = json_decode($result);foreach($a as $k=>$v) $r[] = array('name' => $k, 'value' => $v); echo json_encode($r);echo $r;

function get_js_array($sql){	$result = mysql_query($sql);	$arr = array();	while($row = mysql_fetch_array($result, MYSQL_ASSOC)){		$arr[] = $row;  	}	$js = json_encode($arr);	mysql_free_result($result);	mysql_close($conn);	return $js;}

$s = '[{"phone":"18511337033","name":"ggg","id_card":"123321123321"}]';$a = json_decode($s, 1);foreach($a as $t) {  $r = array();  foreach($t as $k=>$v) $r[] = array('name' => $k, 'value' => $v);  $res[] = $r;}echo json_encode($res);

$s = '[{"phone":"18511337033","name":"ggg","id_card":"123321123321"}]';$a = json_decode($s, 1);foreach($a as $t) {  $r = array();  foreach($t as $k=>$v) $r[] = array('name' => $k, 'value' => $v);  $res[] = $r;}echo json_encode($res);

$s = '[{"phone":"18511337033","name":"ggg","id_card":"123321123321"}]';$a = json_decode($s, 1);foreach($a as $t) {  $r = array();  foreach($t as $k=>$v) $r[] = array('name' => $k, 'value' => $v);  $res[] = $r;}echo json_encode($res);

$s = '[{"phone":"18511337033","name":"ggg","id_card":"123321123321"}]';$a = json_decode($s, 1); foreach($a as $t) {  $r = array();  foreach($t as $k=>$v) $r[] = array('name' => $k, 'value' => $v);  $res[] = $r;} echo json_encode(array_pop($res));