How to combine arrays in PHP_PHP tutorial

How to combine arrays in PHP

1. array array_merge(array $array1[, array $...])

Merge the elements of one or more arrays, append the following elements to the previous elements, and return the resulting array.

Code:

$arr1 = array(
    'astr1' => 'astr1',
    3 => 'anum1'
);

$arr2 = array(
    1 => 'bnum1',
    2 => 'bnum2',
    'bstr1' => 'bstr1',
    3 => 'bnum3',
    'astr1' => 'bstr2',
    '0' => 'bstr3',
    '1' => 'bstr4'
);

print_r(array_merge($arr1, $arr2));

Result:

Array
(
    [astr1] => bstr2
    [0] => anum1
    [1] => bstr4
    [2] => bnum2
    [bstr1] => bstr1
    [3] => bnum3
    [4] => bstr3
)

Conclusion:

Elements whose key is a numeric value are reordered according to increasing rules starting from key=0. If there are duplicate key values, they are still sorted in increasing order;

Key is the element of the string, arranged in the original order. If there is a duplicate key, the subsequent value will overwrite the previous value;

When the key is ‘0’, it is processed as numbers; when the key is ‘1’, ‘2’ and other numeric strings, the previous values ​​of key 1 and 2 will be overwritten

http://www.bkjia.com/PHPjc/934464.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/934464.htmlTechArticleMethod of array merging in PHP 1. array array_merge(array $array1[, array $...]) Merge One or more array elements, append the following elements to the previous elements, and return the result...