POST request with file_get_contents()

_.php

<?php

file_get_contents(
    'https://blah.com/toto.php?something=whatever',
    false,
    stream_context_create(['http' => [
        'method' => 'POST',
        'header' => 'Content-type: application/x-www-form-urlencoded',
        'content' => http_build_query(['hello' => 'goodbye']),
    ]
]));