SuiteCRM-Core/public/legacy/php_version.php

<?php
if (!defined('sugarEntry') || !sugarEntry) {
    die('Not A Valid Entry Point');
}

// The absolute minimum version on which to install SuiteCRM
if (!defined('SUITECRM_PHP_MIN_VERSION')){
    define('SUITECRM_PHP_MIN_VERSION', '7.3.0');
}

// The minimum recommended version on which to install SuiteCRM
if (!defined('SUITECRM_PHP_REC_VERSION')){
    define('SUITECRM_PHP_REC_VERSION', '7.3.0');
}