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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$tree = [[1, [3, 2]], 2, [3, 5], 2, [130, [1, [550, 10]]]];
$result = [];
$merge = array_merge($result, $tree);
var_dump(json_encode($merge));
foreach ($tree as $item) {
if (is_array($item)) {
$result = array_merge($result, $item);
}
}
var_dump(json_encode($result));