PHP obtains some values in the string according to the specified characters, and reorganizes the remaining strings into a new array

Original string

SystemStatus_View_1.00

Results show ：

 /*
    array(2) {
    ["version"]=>
    string(4) "1.00"
    ["code"]=>
    string(17) "SystemStatus_+_View"
    }
     */

<?php
/** 
 *  function ： Split string SystemStatus_View_1.00, according to _ Take out the last part 1.00;
 *        And the remaining parts are spliced into SystemStatus_+_View
*/
    define('SYSTEMSTATUS_VIEW', 'SystemStatus_View_1.00'); 

    function strFun($str)
    {
        $ret = array();
        if($str){
            $tmp = explode('_', $str);
            var_dump($tmp);
            /*
            array(3) {
                [0]=>
                string(12) "SystemStatus"
                [1]=>
                string(4) "View"
                [2]=>
                string(4) "1.00"
            }
            */
            echo count($tmp); //3

            if(preg_match('/\d+.\d+/', $tmp[count($tmp)-1]))
            {
                $ret['version'] = array_pop($tmp);  //array_pop() Function to delete the last element in the array 
                $ret['code'] = implode('_+_', $tmp);  //implode() Function returns a string composed of array elements . Group elements into a string 
            }
        }

        return $ret;
    }

    var_dump(strFun(SYSTEMSTATUS_VIEW));
   
?>