memoization.php

memoization.php

<?php
  
if (! function_exists('memoization')) {
    /**
     * 记忆录
     *
     * @param  callable  $callback
     * @param ...$parameter
     *
     * @return mixed
     */
    function memoization(callable $callback, ...$parameter)
    {
        $parameters = array_merge((array)$callback, $parameter);

        $uniqueKey = md5(array_reduce($parameters, function ($carry, $parameter){
            return $carry.(is_object($parameter) ? spl_object_hash($parameter) : serialize($parameter));
        }, ''));

        global $memoize0411bbf538f3d60ccbdfa6c6b867b979;

        // isset($memoize0411bbf538f3d60ccbdfa6c6b867b979[$uniqueKey]) or $memoize0411bbf538f3d60ccbdfa6c6b867b979[$uniqueKey] = call_user_func_array($callback, $parameter);
        if (! isset($memoize0411bbf538f3d60ccbdfa6c6b867b979[$uniqueKey])) {
            $memoize0411bbf538f3d60ccbdfa6c6b867b979[$uniqueKey] = call_user_func_array($callback, $parameter);
        }

        return $memoize0411bbf538f3d60ccbdfa6c6b867b979[$uniqueKey];
    }
}

var_dump(memoization(function (){
    return rand(111111, 999999);
}));
var_dump(memoization(function (){
    return rand(111111, 999999);
}));
var_dump(memoization(function (){
    return rand(111111, 999999);
}));

// int(638411)
// int(638411)
// int(638411)