decorator.php

<?php

/**
 * @desc decorator
 */

function save_db($str){
    $wrap_func = function() use ($str) {
        echo "run wrap_func".PHP_EOL;
        echo "string = $str".PHP_EOL;
    };
    db_trans($wrap_func);
}

function save_table($str){
    $wrap_func = function() use ($str) {
        echo "run wrap".PHP_EOL;
        echo $str.PHP_EOL;
    };
    db_trans($wrap_func);
}

function db_trans($method){
    try{
        echo "run db_trans".PHP_EOL;
        $method();
    }catch(Exception $e){
        echo $e->getMessage();
    }
}

$str = "John,Mary,David";

save_db($str);
save_table($str);