PHP合并两个数组的两种方式

3. echo "\r\n第一种情况\r\n";

4. $a=array(1,2,3,4,5,6);
5. $b=array(7,8,9);
7. $c=array_merge ($a,$b);
8. print_r($c);
9. $c=$a+$b;
10. print_r($c);
11. $c=$b+$a;
12. print_r($c);

13. echo "\r\n第二种情况\r\n";

14. $a=array('a','b','c','d','e','f');
15. $b=array('a','x','y');
17. $c=array_merge ($a,$b);
18. print_r($c);
19. $c=$a+$b;
20. print_r($c);
21. $c=$b+$a;
22. print_r($c);
24. echo "\r\n第三种情况\r\n";
26. $a=array(
27. 1=>'a',
28. 2=>'b',
29. 3=>'c',
30. 4=>'d',
31. 5=>'e',
32. 6=>'f');
33. $b=array(
34. 1=>'a',
35. 7=>'x',
36. 8=>'y');
38. $c=array_merge ($a,$b);
39. print_r($c);
40. $c=$a+$b;
41. print_r($c);
42. $c=$b+$a;
43. print_r($c);
44. ?>

输出结果： 第一种情况 Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 [8] => 9 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) Array ( [0] => 7 [1] => 8 [2] => 9 [3] => 4 [4] => 5 [5] => 6 ) 第二种情况 Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f [6] => a [7] => x [8] => y ) Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f ) Array ( [0] => a [1] => x [2] => y [3] => d [4] => e [5] => f ) 第三种情况 Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f [6] => a [7] => x [8] => y ) Array ( [1] => a [2] => b [3] => c [4] => d [5] => e [6] => f [7] => x [8] => y ) Array ( [1] => a [7] => x [8] => y [2] => b [3] => c [4] => d [5] => e [6] => f )