PHP Classes

PHP Resource Type Extension: Extend PHP resource values to save and load values

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Version License PHP version Categories
e-resource 1.0.0Custom (specified...5PHP 5, Data types
Description 

Author

This class can extend PHP resource values to save and load values.

An object of this class take a resource values returned for instance from fopen or imagepng functions and provides functions to save the object values to a string using the regular PHP serialize or export functions.

Other PHP functions like unserialize can be use restore the object to its original state from a string returned from the serialized function.

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May 2018
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When PHP for instance opens a file or a database connection, it creates a resource number value that is used by PHP internally to determine what is the resource that was created.

PHP resources are just numbers, but PHP does not provide a means to save those resource numbers and be able to recreate the original resource and reload it later.

This package provides a solution that overcomes that PHP limitation. It can work with regular PHP functions like serialize, unserialize and var_export.

Manuel Lemos
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Example

<?php
require_once('Extended_resource.class.php');

echo
'<pre>';
$x=new resource('fopen("'.str_replace("\\","/",__FILE__).'","rb+")');
$x->dump();

echo
'<br>';
echo
'<br>';

$x->export();
echo
'<br>';
echo
'<br>';

print_r($x);
echo
'<br>';
echo
'<br>';

var_dump(
$x->type(),
ftell($x->use_resource())
);


fseek($x->use_resource(),98);

$u=$x->use_resource();
echo
'<br>';
echo
'<br>';
var_dump(ftell($u));
echo
'<br>';
echo
'<br>';

var_dump($y=serialize($x));
echo
'<br>';
echo
'<br>';

var_dump(unserialize($y));
echo
'<br>';
echo
'<br>';

try{
   
resource();
}catch (
Exception $e) {
    echo
'Exception : ', $e->getMessage(), "\n";
}
echo
'<br>';
echo
'<br>';

$u=var_export(unserialize($y),true);
echo
'<br>';
echo
'<br>';

eval(
'$t = '.$u.';');

var_dump($t);


var_dump(clone($t));

class
test{
    public
$property,$position=null;
   
    public function
__construct(){
       
$this->property=resource('fopen("'.str_replace("\\","/",__FILE__).'","rb+")');
       
    }
   
    public function
seek($position,$whence=false){
       
fseek($this->property->use_resource(),$position,$whence);
       
$this->position=$position;
    }
   
   
    public function
gets($length=null){
        if(
is_int($length)) $line=fgets($this->property->use_resource(),$length);
        else
$line=fgets($this->property->use_resource());
       
$this->position=ftell($this->property->use_resource());
        return
$line;
           
    }
   
    public function
tell(){
        return
$this->position;
    }
                       
    public function
__wakeup(){
       
$this->seek($this->position);
    }
                   
                   
}

$test= new test();

var_dump($test);
$content='';
while(
$line=$test->gets()){
   
$content.=$line;
   
var_dump($test->tell());
}

highlight_string($content);

$test2=serialize($test);
echo
'<br>';
echo
'<br>';

print_r($test2=unserialize($test2));
echo
'<br>';
echo
'<br>';
var_dump($test2->tell());


?>


  Files folder image Files  
File Role Description
Accessible without login Plain text file example.php Example example script
Accessible without login Plain text file example1.php Example example script
Plain text file Extended_resource.class.php Class class source
Accessible without login Plain text file license.txt Lic. license file
Accessible without login Plain text file readme.txt Doc. readme

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