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Reverse print_r result

Posted on 2014-02-14
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582 Views
Last Modified: 2016-10-13
Ive got a string contiaing the results from a print_r by using:-
     $myDump = print_r($_SERVER,true);

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However now I need to convert $myDump back into an Array, so something like:-
     $myArray = toArray($myDump);

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So in the end $myArray should be an exact replica of what $_Server was when I issues print_r ????

So my question is any ideas how I can convert the string

Array
(
    [radQ1] => Yes
    [radQ1_Comments] => Comments...
)
to an array?
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Question by:tonelm54
  • 2
4 Comments
 
LVL 43

Expert Comment

by:Chris Stanyon
ID: 39858672
Just use the $_SERVER array! You haven't changed it.

If you need to save the $_SERVER array for later, then just save that in a variable:

$myServerArray = $_SERVER;
$myDump = print_r($myServerArray, true);
0
 
LVL 109

Expert Comment

by:Ray Paseur
ID: 39858755
If you need to save the $_SERVER array for later,
... then you have a very funky code smell!  In fact, you have a code stench.

But I expect the question is not really about $_SERVER, but about any general print_r() output -- can it be un-munged and turned into the original data set?  I've wondered about this myself since many questions here at EE contain the output of print_r() as a representation of the test data, and I have often had to spend some time converting that back into a PHP variable.

I found this "script kiddie hack" example some time ago and put it into my untested library.  It looked interesting, but I have never tried to document or test it.  It might provide a germ of an idea.  I believe it is supposed to reverse var_dump() output which seems feasible.  It would be harder, I think, to reverse print_r() because you do not have all of the data type representations and would have to make some assumptions.

<?php // RAY_un_var_dump.php

// UNTESTED

function unvar_dump($str) {
    if (strpos($str, "\n") === false) {
        //Add new lines:
        $regex = array(
            '#(\\[.*?\\]=>)#',
            '#(string\\(|int\\(|float\\(|array\\(|NULL|object\\(|})#',
        );
        $str = preg_replace($regex, "\n\\1", $str);
        $str = trim($str);
    }
    $regex = array(
        '#^\\040*NULL\\040*$#m',
        '#^\\s*array\\((.*?)\\)\\s*{\\s*$#m',
        '#^\\s*string\\((.*?)\\)\\s*(.*?)$#m',
        '#^\\s*int\\((.*?)\\)\\s*$#m',
        '#^\\s*float\\((.*?)\\)\\s*$#m',
        '#^\\s*\[(\\d+)\\]\\s*=>\\s*$#m',
        '#\\s*?\\r?\\n\\s*#m',
    );
    $replace = array(
        'N',
        'a:\\1:{',
        's:\\1:\\2',
        'i:\\1',
        'd:\\1',
        'i:\\1',
        ';'
    );
    $serialized = preg_replace($regex, $replace, $str);
    $func = create_function(
        '$match',
        'return "s:".strlen($match[1]).":\\"".$match[1]."\\"";'
    );
    $serialized = preg_replace_callback(
        '#\\s*\\["(.*?)"\\]\\s*=>#',
        $func,
        $serialized
    );
    $func = create_function(
        '$match',
        'return "O:".strlen($match[1]).":\\"".$match[1]."\\":".$match[2].":{";'
    );
    $serialized = preg_replace_callback(
        '#object\\((.*?)\\).*?\\((\\d+)\\)\\s*{\\s*;#',
        $func,
        $serialized
    );
    $serialized = preg_replace(
        array('#};#', '#{;#'),
        array('}', '{'),
        $serialized
    );

    return unserialize($serialized);
}

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LVL 109

Accepted Solution

by:
Ray Paseur earned 500 total points
ID: 39858866
Please see http://www.laprbass.com/RAY_temp_tonelm54.php

This is only a starting point -- it would need a lot of work to deal with things like multidimensional arrays and objects.

<?php // RAY_temp_tonelm54.php
error_reporting(E_ALL);
echo '<pre>';

// THE ORIGINAL PRINT_R() OUTPUT IN A STRING
$str = <<<EOD
Array
(
    [radQ1] => Yes
    [radQ1_Comments] => Comments...
)
EOD;

// SHOW THE STARTING POINT
echo htmlentities($str);
echo PHP_EOL;

// PROCESS EACH LINE OF THE PRINT_R()
$new = array();
$arr = explode(PHP_EOL, $str);
foreach ($arr as $sub)
{
    if (strpos($sub, '['))
    {
        // ISOLATE THE KEY
        preg_match('#\[(.*?)\]#', $sub, $mat);
        $key = $mat[1];

        // AND THE VALUE
        preg_match('#\=\> (.*?)$#', $sub, $mat);
        $val = $mat[1];

        // ADD TO THE ARRAY
        $new[$key] = $val;
    }
}

// WHAT JUST HAPPENED
print_r($new);
echo PHP_EOL;

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0
 

Expert Comment

by:Ondrej Letacek
ID: 41841854
Hi,
There is a print_r_reverse function described on http://php.net/manual/en/function.print-r.php
Alternatively, you can look at online tool on https://www.nestforms.com/php-print_r-to-json-online where you can convert the print_r result into the json (which you can import into PHP by json_decode).
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