$arr1 = array(1,2,3,4,5,6,7,8);
$arr2 = array(3,4,5,7,9,10);
//方法1
function mergeOrderly1($arr1,$arr2){
 $i=0;$j=0;
 $int = array();
 while($i<count($arr1) && $j<count($arr2)){
  $int[] = $arr1[$i]<$arr2[$j]?$arr1[$i++]:$arr2[$j++];
 }
 while($i<count($arr1)){
  $int[] = $arr1[$i++];
 }
 while($j<count($arr2)){
  $int[] = $arr2[$j++];
 }
 //$int = array_merge($int,array_slice($arr1,$i));
 //$int = array_merge($int,array_slice($arr2,$j));
 return $int;
}
//方法2
function mergeOrderly2($arr1,$arr2){
 $arr = array();//定义最终数组容器
 $arr2Num = count($arr2);//统计数组长度
 $arr1Num = count($arr1);
 $i1 = 0;//数组1 的循环标记
 $i2 = 0;//数组2 的循环标记
 while($i1 < $arr1Num || $i2 < $arr2Num){//是否还需要合并
  if($i1 < $arr1Num && $i2 < $arr2Num){//当两个数组都没有到达末尾，情况一
   if($arr1[$i1] > $arr2[$i2]){//需要比较数组1和数组2，小的放入目标数组，并且标记+1
    $arr[] = $arr2[$i2];
    $i2++;
   }else{
    $arr[] = $arr1[$i1];
    $i1++;
   }
  }elseif($i1 < $arr1Num && $i2 >= $arr2Num){//数组2 已经到达末尾，而数组1还为到达，情况二
   $arr[] = $arr1[$i1];//直接把数组1的内容插入到目标数组中
   $i1++;
  }elseif($i2 < $arr2Num && $i1 >= $arr1Num){//数组1已经到达末尾，而数组2还未到达，情况三
   $arr[] = $arr2[$i2];//直接把数组2的内容插入到目标数组中
   $i2++;
  }
 }
 return $arr;
}
print_r(mergeOrderly1($arr1,$arr2));
print_r(mergeOrderly2($arr1,$arr2));

Array
(
 [0] => 1
 [1] => 2
 [2] => 3
 [3] => 3
 [4] => 4
 [5] => 4
 [6] => 5
 [7] => 5
 [8] => 6
 [9] => 7
 [10] => 7
 [11] => 8
 [12] => 9
 [13] => 10
)
Array
(
 [0] => 1
 [1] => 2
 [2] => 3
 [3] => 3
 [4] => 4
 [5] => 4
 [6] => 5
 [7] => 5
 [8] => 6
 [9] => 7
 [10] => 7
 [11] => 8
 [12] => 9
 [13] => 10
)

$arr1 = array(1,2,3,4,5);
$arr2 = array(1,2,3,6,7);
$arr3 = array('0'=>1,'1'=>2,'2'=>3,'3'=>4,'4'=>5);
$arr4 = array('0'=>1,'1'=>2,'2'=>3,'3'=>6,'4'=>7);
$arr5 = array('0'=>1,'a'=>2,'b'=>3,'c'=>4,'4'=>5);
$arr6 = array('0'=>1,'a'=>2,'c'=>3,'d'=>6,'4'=>7);
var_dump(array_merge($arr1, $arr2));
var_dump($arr1+$arr2);
var_dump(array_keys(array_flip($arr1)+array_flip($arr2)));
echo '<br>';
var_dump(array_merge($arr3, $arr4));
var_dump($arr3+$arr4);
var_dump(array_keys(array_flip($arr3)+array_flip($arr4)));
echo '<br>';
var_dump(array_merge($arr5, $arr6));
var_dump($arr5+$arr6);

array(10) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(1) [6]=> int(2) [7]=> int(3) [8]=> int(6) [9]=> int(7) } array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) } array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) } 
array(10) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(1) [6]=> int(2) [7]=> int(3) [8]=> int(6) [9]=> int(7) } array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) } array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) } 
array(8) { [0]=> int(1) ["a"]=> int(2) ["b"]=> int(3) ["c"]=> int(3) [1]=> int(5) [2]=> int(1) ["d"]=> int(6) [3]=> int(7) } array(6) { [0]=> int(1) ["a"]=> int(2) ["b"]=> int(3) ["c"]=> int(4) [4]=> int(5) ["d"]=> int(6) }