How can I capture the result of var_dump to a string?

Question

I\'d like to capture the output of var_dump to a string.

The PHP documentation says;

As with anything that outputs its result directly to the

Answer 1

This maybe a bit off topic.

I was looking for a way to write this kind of information to the Docker log of my PHP-FPM container and came up with the snippet below. I'm sure this can be used by Docker PHP-FPM users.

fwrite(fopen('php://stdout', 'w'), var_export($object, true));

Answer 2

I really like var_dump()'s verbose output and wasn't satisfied with var_export()'s or print_r()'s output because it didn't give as much information (e.g. data type missing, length missing).

To write secure and predictable code, sometimes it's useful to differentiate between an empty string and a null. Or between a 1 and a true. Or between a null and a false. So I want my data type in the output.

Although helpful, I didn't find a clean and simple solution in the existing responses to convert the colored output of var_dump() to a human-readable output into a string without the html tags and including all the details from var_dump().

Note that if you have a colored var_dump(), it means that you have Xdebug installed which overrides php's default var_dump() to add html colors.

For that reason, I created this slight variation giving exactly what I need:

function dbg_var_dump($var)
    {
        ob_start();
        var_dump($var);
        $result = ob_get_clean();
        return strip_tags(strtr($result, ['=>' => '=>']));
    }

Returns the below nice string:

array (size=6)
  'functioncall' => string 'add-time-property' (length=17)
  'listingid' => string '57' (length=2)
  'weekday' => string '0' (length=1)
  'starttime' => string '00:00' (length=5)
  'endtime' => string '00:00' (length=5)
  'price' => string '' (length=0)

Hope it helps someone.

Answer 3

Use output buffering:

<?php
ob_start();
var_dump($someVar);
$result = ob_get_clean();
?>

Answer 4

You may also try to use the serialize() function. Sometimes it is very useful for debugging purposes.

Answer 5

Here is the complete solution as a function:

function varDumpToString ($var)
{
    ob_start();
    var_dump($var);
    return ob_get_clean();
}

Answer 6

You could also do this:

$dump = print_r($variable, true);