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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr[0] = [
'id' => 1,
'source' => 'sourceText',
'leadMagnetConfirmation' => [
'phone' => 546984659,
'isSend' => 1
]
];
echo '<pre>';
var_dump(array_merge_recursive($arr[0], array_values($arr[0]['leadMagnetConfirmation'])));
echo '</pre>';