SuiteCRM 7.6.1 Upgrade - PHP Version Requirement

What is the official PHP version required for 7.6.1?

I have read that is is PHP 5.5.0 but the following code in the pre-installation script requires something higher than 5.5.0:

SuiteCRM-Upgrade-7.4.x-to-7.6.1/pre_install.php

function checkPHP($minVersion = '5.5.0', $operator = '<=') {

    if (version_compare(PHP_VERSION, $minVersion, $operator)) {
        $errMessage = 'Invalid PHP version, acceptable PHP version is ' . $minVersion . '+. ';
        echo $errMessage . '<br>
            <form method="post" action="">

                <input type="hidden" name="module" value="UpgradeWizard">
                <input type="hidden" name="action" value="index">
                <input type="hidden" name="step" value="-1">
                <input type="submit" class="button" value="Cancel">
            </form>';
        throw new Exception($errMessage);
        //exit;
    }

}

This version check will not allow the upgrade to complete if the PHP Version is 5.5.0. It throws an error for anything 5.5.0 and below (<=), including 5.5.0. Is this correct?

If so, it suggests a requirement of 5.5.

This matrix
https://suitecrm.com/wiki/index.php/Compatibility_Matrix
says PHP 5.5 was already a requirement for versions 7.5.x, which is strange, because I upgraded up to 7.5.3 and my PHP is still 5.4.

The matrix is still pending being updated for versions 7.6.x, there’s nothing there about that (yet).