PHP-使用另一个数组从多维数组获取值

Question

I have two arrays:

$mainArray = array(
        ['id' => 1, 'name' => 'test'],
        ['id' => 2, 'name' => 'news'],
        ['id' => 3, 'name' => 'foo'],
        ['id' => 4, 'name' => 'bar']...
        );

$array = array(1,2,5,6,7);

I need to check if the id from the $mainArray is contained in the $array , and if it is contained it needs to print the name. How can I do this?

Answer 1

simple!

foreach($mainArray as $arr) {
    if(in_array($arr['id'], $array)) {
        echo $arr['id'];
    }
}

Answer 2

This should work for you:

(With this solution you have an array with the id as key and the name as value )

<?php

    $mainArray = array(
                    ['id' => 1, 'name' => 'test'],
                    ['id' => 2, 'name' => 'news'],
                    ['id' => 3, 'name' => 'foo'],
                    ['id' => 4, 'name' => 'bar']
                );

    $array = array(1,2,5,6,7);
    $result = array();

    foreach($mainArray as $k => $v)
        $result[$v["id"]] = (array_intersect($mainArray[$k], $array) ? $mainArray[$k]["name"] : "");

    $result = array_filter($result);
    print_r($result);

?>

Output:

Array ( [1] => test [2] => news )

And you can easy go through the array an print every thing like this:

array_walk($result, function($value, $key) { 
    echo "Key: $key Value: $value <br />";
});

//OR

foreach($result as $key => $value)
    echo "Key: $key Value: $value <br />";

Output:

Key: 1 Value: test 
Key: 2 Value: news