curl header parsing functions

curl_header_parsers.php

<?php
/**
 * Extract response headers from curl result as array keyed by header name
 *
 * @param string $result Return from curl_exec()
 * @param CurlHandle $ch  Return from curl_init()
 * @return array<string,string>
 */
function getCurlResponseHeaders(string $result, CurlHandle $ch): array {
    $headersString = substr($result, 0, curl_getinfo($ch, CURLINFO_HEADER_SIZE));
    $headersLines = array_values(array_filter(explode(PHP_EOL, $headersString), fn($l) => preg_match('/^[A-Za-z0-9\-]+:/', $l)));
    return array_combine(array_map(fn($h) => substr($h, 0, strpos($h, ":")), $headersLines),
        array_map(fn($h) => trim(substr($h, strpos($h, ":") + 1)), $headersLines));
}
     
/**
 * Extract response headers from curl as associated array keyed by header name of arrays of header values
 *
 * @param  string $result The return from curl_exec
 * @param  CurlHandle $ch The return from curl_init
 * @return array<string, <array string>>
 */
function getCurlResponseHeadersArrays(string $result, CurlHandle $ch): array {
    $headersString = substr($result, 0, curl_getinfo($ch, CURLINFO_HEADER_SIZE));
    $headersLines = array_values(array_filter(explode(PHP_EOL, $headersString), fn($l) => preg_match('/^[A-Za-z0-9\-]+:/', $l)));
    $headerKeys = array_unique(array_map(fn($h) => substr($h, 0, strpos($h, ":")), $headersLines));

    $headersArray = [];
    foreach($headersLines as $h) {
        $headersArray[substr($h, 0, strpos($h, ":"))][] = trim(substr($h, strpos($h, ":") + 1));
    }

    return $headersArray;
}