php从数组元素中获取字符串并连接成新的数组元素

Question

I am trying to return array strings based on position, concatenate and append into a new array.

$matches = ([0] => 20170623 004129 982 a [4] => 20170623 004130 982 b [8] => 
            20170623 004130 982 b)
foreach ($matches as $match){
    $arr2 = explode(" ", $match);
    echo $arr2[0] . $arr2[1] . $arr2[2];

The for loop works for explode and can see each element(strings) of the array being separated into a new array $arr2, but each pass through the loop overwrites $arr2. My echo is returning the same result (the result of the last pass) multiple times. Looks like once for each pass.

Expected output, maybe something like:

$arr3 = ([0] => 20170623004129982 [1] => 20170623004130982 [3] => 
            20170623004130982)

Answer 1

You need array_push()

In your case

<?php
    $arr2 = [];
    foreach ($matches as $match) {
        $values = explode(" ", $match);
        array_push($arr2, $values[0], $values[1], $values[2]);   
    }

    var_dump($arr2); // now $arr2 should contain all values
?>