mbstring iconv script

<?php

function getPropertyFromPhpInfo($pattern)
{
    ob_start();
    phpinfo();
    $phpinfo = ob_get_clean();

    $result = preg_match($pattern, $phpinfo, $matches);

    if ($result !== 1) {
        return null;
    }

    return $matches[0];
}

function getIconvEncodings()
{
    $encodings = shell_exec('/usr/bin/iconv --list');
    $encodings = strtolower(trim($encodings));
    $encodings = str_replace('//', '', $encodings);
    $encodings = preg_split('/\s+/', $encodings);

    return $encodings;
}

function getMbstringEncodings()
{
    $encodings = mb_list_encodings();
    $encodings = array_map('strtolower', $encodings);

    return $encodings;
}

function makeTableRow($encoding, $iconv, $mbstring)
{
    $output  = sprintf('%20s', $encoding) . '    ';
    $output .= sprintf('%-5s', $iconv   ) . '    ';
    $output .= sprintf('%-5s', $mbstring) . PHP_EOL;

    return $output;
}


error_reporting(E_ALL & ~E_NOTICE);
date_default_timezone_set('UTC');

echo getPropertyFromPhpInfo('/PHP Version => [0-9.]+/'           ) . PHP_EOL;
echo getPropertyFromPhpInfo('/Multibyte string engine => [a-z]+/') . PHP_EOL;
echo getPropertyFromPhpInfo('/libmbfl version => [0-9.]+/'       ) . PHP_EOL;
echo getPropertyFromPhpInfo('/iconv implementation => [a-z]+/'   ) . PHP_EOL;
echo getPropertyFromPhpInfo('/iconv library version => [0-9.]+/' ) . PHP_EOL . PHP_EOL;

$encodings = [
    'iconv'    => getIconvEncodings(),
    'mbstring' => getMbstringEncodings()
];

foreach ($encodings as $lib => $encs) {
    echo $lib . ' encodings:' . PHP_EOL;
    print_r($encs);
    echo PHP_EOL;
}

$commonEncodings = array_intersect($encodings['iconv'], $encodings['mbstring']);

sort($commonEncodings);

define('TOTAL_BYTES', 1000);

$data = openssl_random_pseudo_bytes(TOTAL_BYTES);

echo 'Common encodings, with calculated lengths for ' . TOTAL_BYTES . ' bytes:' . PHP_EOL;
echo makeTableRow('ENCODING', 'ICONV', 'MBSTRING');

foreach ($commonEncodings as $encoding) {

    echo makeTableRow(
        $encoding,
        iconv_strlen($data, $encoding . '//IGNORE'),  // From Patchwork\PHP\Shim\Mbstring
        mb_strlen($data, $encoding)
    );

}