php merge arrays

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Merge arrays Method

1. array_merge：
   数字键，直接往后添加，key重置
   字符串键，后面的数组的值会替代前面的值
   +：
   数字键，后面的数组的值不会替代前面的值
   字符串键，后面的数组的值会替代前面的值

Merge arrays and remove duplicates

//1.单数组去重复
    array_unique($arrTest)//2.多数组去重复
    array_keys(array_flip($arr1)+array_flip($arr2))

php array_merge合并方法
例子1，数组使用字符串键名，相同的键名会被后面的覆盖

<?php $arr1 = array(&#39;name&#39;=>'fdipzone');
$arr2 = array('name'=>'terry');
$result = array_merge($arr1, $arr2);
print_r($result);
?>

Output:

Array
(
    [name] => terry
)

Example 2, the array uses numeric key names. The same key names will not be overwritten, and the key names will be re-indexed

<?php $arr1 = array(0=>'fdipzone',1=>'terry');
$arr2 = array(0=>'php',1=>'python');
$result = array_merge($arr1, $arr2);
print_r($result);
?>

Output:

Array
(
    [0] => fdipzone
    [1] => terry
    [2] => php
    [3] => python
)

Use array_merge to merge two parts of the answer

<?php $form_data1 = array(11=>'A',12=>'B',13=>'C',14=>'D');
$form_data2 = array(25=>'B',26=>'A',27=>'D',28=>'C');

$result = array_merge($form_data1, $form_data2);

print_r($result);
?>

Output

Array
(
    [0] => A
    [1] => B
    [2] => C
    [3] => D
    [4] => B
    [5] => A
    [6] => D
    [7] => C
)

Merge arrays and keep keys Value method:

<?php $form_data1 = array(11=>'A',12=>'B',13=>'C',14=>'D');
$form_data2 = array(25=>'B',26=>'A',27=>'D',28=>'C');

$result = $form_data1 + $form_data2;

print_r($result);
?>

Output:

Array
(
    [11] => A
    [12] => B
    [13] => C
    [14] => D
    [25] => B
    [26] => A
    [27] => D
    [28] => C
)

$arr = ['a'=>12,'b'=>13];$arr1 = ['a'=>14,'b'=>15,0=>1,1=>2];$fild = $arr + $arr1;

print_r($fild); Array ( [a] => 12 [b] => 13 [0] => 1 [1] => 2 )

Use the " " operator to merge arrays, you can retain the key values ​​of the array, if merged If the array contains the same key value, the later key value will not overwrite the previous key value (the previous value is retained and the later one is discarded).
Related recommendations:

Two methods of merging arrays in PHP

PHP merging two one-dimensional arrays

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