PHP幾種合併陣列的不同效果

array_merge_recursive — 遞迴地合併乙個或多個陣列

<?php

$first=[
'key'
=>
'no1'];
$second=[
'key'
=>
'no2'];
print_r
(array_merge_recursive
($first
,$second))
;

array

([key]
=>
array([
0]=> no1
[1]=> no2
))

<?php

$first=[
'key'
=>
'no1'
,'key1'
=>
'key1'
,'key2'
=>
'key2'];
$second=[
'key'
=>
'no2'
,'key1'
=>
'key2'];
print_r
(array_merge_recursive
($first
,$second))
;

array

([key]
=>
array([
0]=> no1
[1]=> no2
)[key1]
=>
array([
0]=> key1
[1]=> key2
)[key2]
=> key2
)

array_merge:後面的陣列的value會覆蓋前面陣列的value值

<?php

$first=[
'key'
=>
'no1'
,'key1'
=>
'key1'
,'key2'
=>
'key2'];
$second=[
'key'
=>
'no2'
,'key1'
=>
'key2'];
print_r
(array_merge
($first
,$second))
;array
([key]
=> no2
[key1]
=> key2
[key2]
=> key2
)

array+array兩個陣列合併保留前面的陣列，同時新增後面陣列中新的索引和值

<?php

$first=[
'a',
'b',
'c'=
>2]
;$second=[
'c'=
>1,
'd'=
>3,
'4']
;print_r
($first
+$second
);

array([

0]=> a
[1]=> b
[c]=>
2[d]
=>
3)

′，而first的數字索引是0=>』a』,1=>』b』，列印如下：

$first=[

0=>
'a',1=
>
'b',];
$second=[
0=>
'4',
];

<?php

$first=[
'a',
'b',
'c'=
>2]
;$second=[
'c'=
>1,
'd'=
>3,
'4',5,
6];print_r
($first
+$second
);

array([

0]=> a
[1]=> b
[c]=>
2[d]
=>3[
2]=>
6)

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