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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$datas = array("id" => [], "content" => 2);
$data = array("id" => 3, "content" => 4);
// filter the data
//$data = array_filter($data, fn ($value) => $value['content'] === 'World');
// map the data
//$data = array_map(fn ($value) => ['content' => $value['content']], $data);
// reset indexes
//$data = array_values($data);
$datal = array_sum($data);
$datala = array_filter($datas, fn($e) => empty($e));
print_r($datala);