如何在PHP中将两个数组的其他元素放在相似元素的旁边

Question

I have two arrays like this:

$a1 = array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c1' => 10),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c1' => 20),
    ...
);

$a2 =  = array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c2' => 40),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c2' => 50),
    ...
);

I need to combine these two like this:

$a3 =  = array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c1' => 10, 'c2' => 40),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c1' => 20, 'c2' => 50),
    ...
);

How can I do it using PHP and less code?

Answer 1

The function you're looking for is probably just a single function call: array_replace_recursive()

$a1 = array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c1' => 10),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c1' => 20),
);

$a2 =  array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c2' => 40),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c2' => 50),
);

$result = array_replace_recursive($a1, $a2);
var_dump($result);

which gives:

array(2) {
  [0]=>
  array(4) {
    ["fisrtname"]=>
    string(4) "john"
    ["lastname"]=>
    string(5) "smith"
    ["c1"]=>
    int(10)
    ["c2"]=>
    int(40)
  }
  [1]=>
  array(4) {
    ["fisrtname"]=>
    string(4) "jane"
    ["lastname"]=>
    string(5) "smith"
    ["c1"]=>
    int(20)
    ["c2"]=>
    int(50)
  }
}

Answer 2

您可以使用array_map和array_merge函数来完成此操作。

$a3 = array_map("array_merge",$a1, $a2);

Answer 3

If the array a1 and a2 length is same, You can use code below:

<?php

$a1 = array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c1' => 10),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c1' => 20)
);

$a2 = array(
    array('fisrtname' => 'john', 'lastname' => 'smith', 'c2' => 40),
    array('fisrtname' => 'jane', 'lastname' => 'smith', 'c2' => 50)
);

for ($i=0; $i < count($a1); $i++) { 
    $a3[$i] = array_merge($a1[$i],$a2[$i]);
    $a3[$i] = array_unique($a3[$i]);
}

var_dump($a3);

?>