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Here's an updated PHP script that will act as a proxy, accepting query parameters from the client, making an API call with those parameters, and returning the same result:

<?php

function buildUrl($base, $params) {
    $queryString = http_build_query($params);
    return $base . '?' . $queryString;
}

function fetchUrl($url) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    $content = curl_exec($ch);
    $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
    curl_close($ch);

    return [$content, $contentType];
}

$baseUrl = 'THE_API_END_POINT';
$params = $_GET;
$url = buildUrl($baseUrl, $params);
list($content, $contentType) = fetchUrl($url);

header("Content-Type: $contentType");
echo $content;

Replace THE_API_END_POINT by the API end point you want to wrap.