<?php
$musica = [
["file" => "musica1"],
["file" => "musica2"],
["file" => "musica3"],
["file" => "musica4"],
];
$aviso = [
["file" => "aviso1"],
["file" => "aviso2"],
];
foreach ($musica as $mIndex => $mValue) {
$resultado[] = $mValue;
$resultado[] = $aviso[$mIndex % count($aviso)]; }
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[
{
"file": "musica1"
},
{
"file": "aviso1"
},
{
"file": "musica2"
},
{
"file": "aviso2"
},
{
"file": "musica3"
},
{
"file": "aviso1"
},
{
"file": "musica4"
},
{
"file": "aviso2"
}
]