Cfrtjryk

So, I made a tiny (~2 KB, <100 lines) library for simple flat-file data storage.

How it works is, you define a file to be used, and then you can add/read/modify/delete objects as "keys" to/from the file.

All the code is on github, but I'll put it here too:

varDx.php:

<?php

namespace varDX;



class cDX {

    private $dataFile;  



    public function def($filename){

        $this->dataFile = $filename;

    }



    public function write($varName, $varVal){

        if(file_exists($this->dataFile)){

            $foundLine = $this->check($varName);

        } else {

            $foundLine = false;

        }



        if(!$foundLine){

            $writeData = $varName.'__=__'.urlencode(serialize($varVal)).PHP_EOL;

            file_put_contents($this->dataFile, $writeData, FILE_APPEND);    

        } else {

            return "ERR_DX_KEY_ALREADY_EXISTS";

        }

    }



    public function read($varName){

        if(file_exists($this->dataFile)){

            foreach(file($this->dataFile) as $line) {

                if(strpos($line, $varName) !== false) {

                    list(, $new_str) = explode("__=__", $line);

                    $foundLine = true;

                }

            }

            if($foundLine){

                $val = rtrim($new_str); 

                return unserialize(urldecode($val));

            } else {

                return "ERR_DX_KEY_NOT_FOUND";

            }

        } else {

            return "ERR_DX_FILE_DOES_NOT_EXIST";

        }

    }





    public function del($varName){

        if(file_exists($this->dataFile)){

            $f = $this->dataFile;

            $term = $varName.'__=__';

            $arr = file($f);

            foreach ($arr as $key=> $line) {

                if(stristr($line,$term)!== false){unset($arr[$key]);break;}

            }

            //reindexing array

            $arr = array_values($arr);

            //writing to file

            file_put_contents($f, implode($arr));

        } else {

            return "ERR_DX_FILE_DOES_NOT_EXIST";

        }

    }



    public function modify($varName, $varVal){

        if(file_exists($this->dataFile)){   

            if($this->check($varName)){

                $this->del($varName);

            } 

        }

        $writeData = $varName.'__=__'.urlencode(serialize($varVal)).PHP_EOL;

        file_put_contents($this->dataFile, $writeData, FILE_APPEND);    



    }



    public function check($varName){

        if(file_exists($this->dataFile)){

            foreach(file($this->dataFile) as $line) {

                if(stripos($line, $varName.'__=__') === 0){

                    return true;

                } 

            }

            return false;

        } else {

            return "ERR_DX_FILE_DOES_NOT_EXIST";

        }

    }

}

Usage:

<?php

require 'varDx.php';

$dx = new varDxcDX; //create object

$dx->def('file1.txt'); //define data file



$a = "this is a string";

$dx->write('val1', $a); //write key to file



$dx->modify('val1', "this is another string"); //modify value of key

echo $dx->read('val1'); //read value of key



if($dx->check('val1')){ //check if key exists

    del('val1'); //delete key

}

File storage:

All keys are stored in this format:

keyname__=__urlencode(serialize(value_of_key))

There's more info on the functions in the README on the github page. I'm wondering if I can make this more efficient when dealing with files, and if there's anything else that I'm doing wrong?