• 13Nov

    PHP Tutorial 031: Saving a game through Serialization

    PHP Tutorials

    Remember that Grid game back in tutorial 025? In this tutorial, I convert it to a Command Line Interface game instead of a web server game with a session. This tutorial has 3 parts and goes over the application of the past things I have gone over.
    You need flash to play this tutorial.
    This tutorial goes over the following goals:
    Convert the game from tutorial 25 to Command Line Interface mode
    Use Serialize to save the game
    Use Unserialize to load the game back.
    You can find this tutorial video on youtube here.

    Saving a game through serialization Part 2You need flash to play this tutorial.
    This tutorial goes over the following goals:
    Convert the game from tutorial 25 to Command Line Interface mode
    Use Serialize to save the game
    Use Unserialize to load the game back.
    You can find this tutorial video on youtube here.

    Saving a game through serialization Part 3You need flash to play this tutorial.
    This tutorial goes over the following goals:
    Convert the game from tutorial 25 to Command Line Interface mode
    Use Serialize to save the game
    Use Unserialize to load the game back.
    You can find this tutorial video on youtube here.

    Here are the sources used in this tutorial:
    tacos.txt
    a:2:{s:1:"x";i:0;s:1:"y";i:7;}
    tut031.php
    <?php

//PHP Tut 031 A game that saves through serialization
//get info from user in CLI http://www.php.net/manual/en/features.commandline.php
error_reporting(E_ERROR);
$grid = array();

$width = 20;
$height = 10;
function grid()

{
	global $grid, $height, $width;

	$grid = array();
    for ($x = 0; $x < $width; $x++) {

        for ($y = 0; $y < $height; $y++) {

            $grid[$x][] = "_";
        }

    }
}
grid();
if (!isset($player['x'])) {

    $player['x'] = (int)($width / 2);

}
if (!isset($player['y'])) {

    $player['y'] = (int)($height / 2);

}
//Determine new location based on relative location and given direction
function getdirection($getNew = 0)

{
    global $direction, $status;
    if ($getNew) {

        $line = trim(fgets(STDIN));
        if (strlen($line) > 0) {

            $direction = strtolower(substr($line, 0, 1));

        } else {
            return - 1;
        }

        if ($direction == "e") {
            $status = -1;

        }
        if ($direction == "s") {

            savegame();
        }
        if ($direction == "a") {

            loadgame();
        }
    }
    return $direction;

}
function savegame(){
	global $player;
	echo "\n what file name would you like to save under?\n";

	$line = trim(fgets(STDIN));
	file_put_contents($line, serialize($player));

}
function loadgame(){
	global $player;
	echo "\n what file name would you like to load?\n";

	$line = trim(fgets(STDIN));
	$player = unserialize(file_get_contents($line));

}
$status = 0;
while ($status != -1) {

    if ($status >= 1) {
    	for($t = 0; $t < 9; $t++){

    	echo "\n";
    }
    	echo "Hello, you can say l for left, r for right, u up, and d for down.\nIf you want to exit, say e.\nAlso, if you want to save say s, and for load, use a.";

        if (getdirection(1) != -1) {

        	grid();
            //they gave us a direction so now we will process it.
            if (getdirection() == "l" && $player['x'] > 0) {

                $player['x'] -= 1;
            }

            if (getdirection() == "r" && $player['x'] < $width - 1) {

                $player['x'] += 1;
            }

            if (getdirection() == "d" && $player['y'] < $height - 1) {

                $player['y'] += 1;
            }

            if (getdirection() == "u" && $player['y'] > 0) {

                $player['y'] -= 1;
            }

            //the opposite
            $error = "you bonked your head, therefore you are dead.(not really.)";
            if (getdirection() == "l" && $player['x'] <= 0) {

                echo $error;
            }
            if (getdirection() == "r" && $player['x'] >= $width - 1) {

                echo $error;
            }
            if (getdirection() == "d" && $player['y'] >= $height - 1) {

                echo $error;
            }
            if (getdirection() == "u" && $player['y'] <= 0) {

                echo $error;
            }

        }
    }

    echo "\n";
    echo "\n";
    echo "\n";

    echo "\n";

    $grid[$player['x']][$player['y']] = "X";

    for ($y = 0; $y < $height; $y++) {

        for ($x = 0; $x < $width; $x++) {

            echo $grid[$x][$y];
        }

        echo "\n";
    }

    if ($status == 0) {

        $status = 1;
    }
}
?>

    Here are all the php functions used in this tutorial:

    array echo error_reporting fgets file_get_contents file_put_contents int isset return serialize strlen strtolower substr trim unserialize

    Posted by Kloplop321 @ 7:45 am

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