How to send a post request through header() with php?

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<?php
$url = 'http://example.com/api'; // Replace with your target URL

// Set POST data
$data = array(
    'param1' => 'value1',
    'param2' => 'value2'
);

// Convert data array to a query string
$data = http_build_query($data);

// Set headers
$headers = array(
    'Content-Type: application/x-www-form-urlencoded',
    'Content-Length: ' . strlen($data)
);

// Create a context
$context = array(
    'http' => array(
        'method'  => 'POST',
        'header'  => implode("
", $headers),
        'content' => $data
    )
);

// Send the HTTP request
$result = file_get_contents($url, false, stream_context_create($context));

// Handle the response
echo $result;
?>