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var_export

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

var_export — Retourne le code PHP utilisé pour générer une variable

Description

var_export(mixed $value, bool $return = false): ?string

var_export() retourne des données structurées sur la variable donnée. C'est le même principe que var_dump() mais avec une exception : le résultat retourné est du code PHP valide.

Liste de paramètres

value: La variable que vous voulez exporter.
return: Si utilisé et mis à true, var_export() retournera la représentation de la variable au lieu de l'afficher.

Valeurs de retour

Retourne la représentation de la variable lorsque le paramètre return est utilisé et évalué à true. Autrement, cette fonction retournera null.

Historique

Version	Description
8.2.0	Les noms de classe exportés sont désormais pleinement qualifiés. Auparavant, l'antislash principal était omis.
7.3.0	Exporte désormais les objets stdClass en tant qu'un tableau transtyper vers un objet (`(object) array( ... )`), au lieu d'utiliser la méthode non existante stdClass::__setState(). L'effet pratique est que désormais stdClass est exportable, et que le code résultant fonctionnera même sur des versions antérieure de PHP.

Exemples

Exemple #1 Exemple avec var_export()

<?php

$a = array (1, 2, array ("a", "b", "c"));
var_export($a);

?>

L'exemple ci-dessus va afficher :

array (
  0 => 1,
  1 => 2,
  2 => 
  array (
    0 => 'a',
    1 => 'b',
    2 => 'c',
  ),
)

<?php

$b = 3.1;
$v = var_export($b, true);
echo $v; // 3.1

?>

L'exemple ci-dessus va afficher :

3.1

Exemple #2 Exporter stdClass (à partir de PHP 7.3.0)

<?php
$person = new stdClass;
$person->name = 'ElePHPant ElePHPantsdotter';
$person->website = 'https://php.net/elephpant.php';

var_export($person);

L'exemple ci-dessus va afficher :

(object) array(
   'name' => 'ElePHPant ElePHPantsdotter',
   'website' => 'https://php.net/elephpant.php',
)

Exemple #3 Exporter des classes

<?php
class A { public $var; }
$a = new A;
$a->var = 5;
var_export($a);
?>

L'exemple ci-dessus va afficher :

A::__set_state(array(
   'var' => 5,
))

Exemple #4 Utilisation de __set_state

<?php
class A
{
    public $var1;
    public $var2;

    public static function __set_state($an_array)
    {
        $obj = new A;
        $obj->var1 = $an_array['var1'];
        $obj->var2 = $an_array['var2'];
        return $obj;
    }
}

$a = new A;
$a->var1 = 5;
$a->var2 = 'foo';

eval('$b = ' . var_export($a, true) . ';'); // $b = A::__set_state(array(
                                     //    'var1' => 5,
                                     //    'var2' => 'foo',
                                     // ));
var_dump($b);
?>

L'exemple ci-dessus va afficher :

object(A)#2 (2) {
    ["var1"]=>
    int(5)
    ["var2"]=>
    string(3) "foo"
}

Notes

Note:
Les variables de type ressource ne peuvent être exportées par cette fonction.

Note:
var_export() ne gère pas les références circulaires car il serait impossible de générer un code PHP analysable pour ce type de données. Si vous voulez faire quelque chose avec la représentation complète d'un tableau ou d'un objet, utilisez la fonction serialize().

Avertissement

Antérieur à PHP 8.2.0, lorsque var_export() exporte des objets, l'antislash initial n'est pas inclus dans l'espace de nom de la classe et ce, pour un maximum de compatibilité.

Note:
Pour être capable d'évaluer le PHP généré par var_export(), tous les objets analysés doivent implémenter la méthode magique __set_state. La seule exception est stdClass; qui est exportée en utilisant un cast d'un tableau à un objet.

Voir aussi

print_r() - Affiche des informations lisibles pour une variable
serialize() - Génère une représentation stockable d'une valeur
var_dump() - Affiche les informations d'une variable

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User Contributed Notes 21 notes

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32

steven at nevvix dot com ¶

5 years ago

I improved my previous varexport().

<?php
/**
 * PHP var_export() with short array syntax (square brackets) indented 2 spaces.
 *
 * NOTE: The only issue is when a string value has `=>\n[`, it will get converted to `=> [`
 * @link https://www.php.net/manual/en/function.var-export.php
 */
function varexport($expression, $return=FALSE) {
    $export = var_export($expression, TRUE);
    $patterns = [
        "/array \(/" => '[',
        "/^([ ]*)\)(,?)$/m" => '$1]$2',
        "/=>[ ]?\n[ ]+\[/" => '=> [',
        "/([ ]*)(\'[^\']+\') => ([\[\'])/" => '$1$2 => $3',
    ];
    $export = preg_replace(array_keys($patterns), array_values($patterns), $export);
    if ((bool)$return) return $export; else echo $export;
}

$array = [
    'str' => 'Test
       spaces',
       0 => 33,
       1 => TRUE,
       [3,4,'d',[]],
    'arr' => [
        'text with spaces' => '[Tes\'t"s":
 => [
 => 
  [
   {
      spaces',
    ],
    "str2" => "Test's'
 } spaces",
    'arr2' => [
        'text with spaces' => [
            'arr3' => [
                'text with spaces' => 'Te": "st \' => [
      spaces',
            ],
        ],
    ],
];
varexport($array);
// Result:
```
[
  'str' => 'Test
       spaces',
  0 => 33,
  1 => true,
  2 => [
    0 => 3,
    1 => 4,
    2 => 'd',
    3 => [
    ],
  ],
  'arr' => [
    'text with spaces' => '[Tes\'t"s":
 => [
 => [
   {
      spaces',
  ],
  'str2' => 'Test\'s\'
 } spaces',
  'arr2' => [
    'text with spaces' => [
      'arr3' => [
        'text with spaces' => 'Te": "st \' => [
      spaces',
      ],
    ],
  ],
]
```
NOTE: The only issue is when a string value has `=>\n[`, it will get converted to `=> [`

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27

steven at nevvix dot com ¶

6 years ago

/**
 * var_export() with square brackets and indented 4 spaces.
 */
<?php
function varexport($expression, $return=FALSE) {
    $export = var_export($expression, TRUE);
    $export = preg_replace("/^([ ]*)(.*)/m", '$1$1$2', $export);
    $array = preg_split("/\r\n|\n|\r/", $export);
    $array = preg_replace(["/\s*array\s\($/", "/\)(,)?$/", "/\s=>\s$/"], [NULL, ']$1', ' => ['], $array);
    $export = join(PHP_EOL, array_filter(["["] + $array));
    if ((bool)$return) return $export; else echo $export;
}

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15

Mark P ¶

8 years ago

It doesn't appear to be documented, but the behaviour of `var_export()` changed in PHP 7.

Previously, `var_export(3.)` returned "3", now it returns "3.0".

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21

chudinov at yahoo dot com ¶

11 years ago

Looks like since version 5.4.22 var_export uses the serialize_precision ini setting, rather than the precision one used for normal output of floating-point numbers.
As a consequence since version 5.4.22 for example var_export(1.1) will output 1.1000000000000001 (17 is default precision value) and not 1.1 as before. 

<?php 
//ouput 1.1000000000000001
var_export(1.1)
 ?>

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8

4n4jmza02 at sneakemail dot com ¶

14 years ago

I learned the hard way that if var_export encounters a resource handle it exports it as "NULL", even if it is a valid handle. The documentation states that a handle cannot be exported, but it does not describe what happens if you try to do so anyway.

I had been using var_export in some debugging code while tracing a problem with a resource handle not being generated and ended up thinking that null handles were still being generated long after the problem had been fixed.

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12

dan at coders dot co dot nz ¶

10 years ago

I found that my complex type was exporting with 
  stdClass::__set_state()
in places. Not only was that strange and messy, it cannot be eval()-ed back in at all. Fatal error. Doh!

However a quick string-replace tidy-up of the result rendered it valid again.

    $macro = var_export($data, TRUE);
    $macro = str_replace("stdClass::__set_state", "(object)", $macro);
    $macro = '$data = ' . $macro . ';';

And now the string I output *can* be evaluated back in again.

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10

laszlo dot heredy at gmail dot com ¶

14 years ago

Try this function instead of var_export($GLOBALS) or var_dump($GLOBALS) when all you want to know is the values of the variables you set on the current page.



<?php

function globalvars(){

    $result=array();

    $skip=array('GLOBALS','_ENV','HTTP_ENV_VARS',

                        '_POST','HTTP_POST_VARS','_GET',

                        'HTTP_GET_VARS',

                        '_COOKIE',

                        'HTTP_COOKIE_VARS','_SERVER',

                        'HTTP_SERVER_VARS',

                        '_FILES','HTTP_POST_FILES',

                        '_REQUEST','HTTP_SESSION_VARS',

                        '_SESSION');

    foreach($GLOBALS as $k=>$v)

        if(!in_array($k,$skip))

            $result[$k]=$v;

    return $result;

}//functionglobalvars



var_export(globalvars());

?>

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12

linus at flowingcreativity dot net ¶

19 years ago

<roman at DIESPAM dot feather dot org dot ru>, your function has inefficiencies and problems. I probably speak for everyone when I ask you to test code before you add to the manual.

Since the issue of whitespace only comes up when exporting arrays, you can use the original var_export() for all other variable types. This function does the job, and, from the outside, works the same as var_export().

<?php

function var_export_min($var, $return = false) {
    if (is_array($var)) {
        $toImplode = array();
        foreach ($var as $key => $value) {
            $toImplode[] = var_export($key, true).'=>'.var_export_min($value, true);
        }
        $code = 'array('.implode(',', $toImplode).')';
        if ($return) return $code;
        else echo $code;
    } else {
        return var_export($var, $return);
    }
}

?>

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5

NitPicker ¶

11 years ago

When it comes to HTML output (as discussed below), it's all fun and games until someone pokes their eye out with a "<".

Surround it with "<pre>", but do remember to wrap it in htmlspecialchars() as well.

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3

beverasrilakshmi at gmail dot com ¶

5 years ago

Just for fun, trying to understand the definition of "returns parsable string"....any type of variable passed to var_export, the return value will be a typecasted as string...

<?php 

$var = 1;
var_dump($var); //type is int as expected 
echo "<br>";
$var_after_export = var_export($var,true); //returning $var will now makes it a string
var_dump($var_after_export);

?>

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5

john dot risken at gmail dot com ¶

14 years ago

I didn't see this simple little item anywhere in the user notes. Maybe I'm blind!



Anyway, var_export and print_r both use spaces and carriage returns for formatting.  Sent to an html page, most of the formatting is lost. This simple function prints a nicely formatted array to an html screen:



<?php

function pretty_var($myArray){

    print str_replace(array("\n"," "),array("<br>","&nbsp;"), var_export($myArray,true))."<br>";

}

?>

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7

17 years ago

Like previously reported, i find var_export() frustrating when dealing with recursive structures.  Doing a :

<?php
var_export($GLOBALS);
?>

fails.  Interestingly, var_dump() has some logic to avoid recursive references.  So :

<?php
var_dump($GLOBALS);
?>

works (while being more ugly).  Unlike var_export(), var_dump() has no option to return the string, so output buffering logic is required if you want to direct the output.

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5

ravenswd at gmail dot com ¶

15 years ago

(This replaces my note of 3-July-2009. The original version produced no output if a variable contained an empty array, or an array consisting only of empty arrays. For example, $bigarray['x'] = array(); Also, I have added a second version of the function.)

The output can be difficult to decipher when looking at an array with many levels and many elements on each level. For example:

<?php
print ('$bigarray = ' . var_export($bigarray, true) . "\n");
?>

will return:

$bigarray = array(
... (500 lines skipped) ...
          'mod' => 'charlie',

Whereas the routine below can be called with:

<?php
recursive_print ('$bigarray', $bigarray);
?>

and it will return:

$bigarray = array()
... (500 lines skipped) ...
$bigarray['foo']['bar']['0']['somethingelse']['mod'] = 'charlie'

Here's the function:

<?php
function recursive_print ($varname, $varval) {
  if (! is_array($varval)):
    print $varname . ' = ' . $varval . "<br>\n";
  else:
    print $varname . " = array()<br>\n";
    foreach ($varval as $key => $val):
      recursive_print ($varname . "['" . $key . "']", $val);
    endforeach;
  endif;
}
?>

For those who want a version that produces valid PHP code, use this version:

<?php
function recursive_print ($varname, $varval) {
  if (! is_array($varval)):
    print $varname . ' = ' . var_export($varval, true) . ";<br>\n";
  else:
    print $varname . " = array();<br>\n";
    foreach ($varval as $key => $val):
      recursive_print ($varname . "[" . var_export($key, true) . "]", $val);
    endforeach;
  endif;
}
?>

If your output is to a text file and not an HTML page, remove the <br>s.

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4

sergei dot solomonov at gmail dot com ¶

12 years ago

<?php

$closure = function(){};



var_export($closure);



// output: Closure::__set_state(array())

?>

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4

jodybrabec at gmail dot com ¶

12 years ago

WORKAROUND for error "Nesting level too deep - recursive dependency":
ob_start();
var_dump($GLOBALS);
$dataDump = ob_get_clean();
echo $dataDump;

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4

Anonymous ¶

13 years ago

There is an even simpler way to have clean output from var_export and print_r in html pages:

<?php 
function pretty_var($myArray)
{ 
    echo "<pre>";
    var_export($myArray);
    echo "</pre>";
} 
?>

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2

stangelanda at arrowquick dot com ¶

17 years ago

I have been looking for the best method to store data in cache files.

First, I've identified two limitations of var_export verus serialize.  It can't store internal references inside of an array and it can't store a nested object or an array containing objects before PHP 5.1.0.

However, I could deal with both of those so I created a benchmark.  I used a single array containing from 10 to 150 indexes.  I've generate the elements' values randomly using booleans, nulls, integers, floats, and some nested arrays (the nested arrays are smaller averaging 5 elements but created similarly).  The largest percentage of elements are short strings around 10-15 characters.  While there is a small number of long strings (around 500 characters).

Benchmarking returned these results for 1000 * [total time] / [iterations (4000 in this case)]

serialize 3.656, 3.575, 3.68, 3.933, mean of 3.71
include 7.099, 5.42, 5.185, 6.076, mean of 5.95
eval 5.514, 5.204, 5.011, 5.788, mean of 5.38

Meaning serialize is around 1 and a half times faster than var_export for a single large array.  include and eval were consistently very close but eval was usually a few tenths faster (eval did better this particular set of trials than usual). An opcode cache like APC might make include faster, but otherwise serialize is the best choice.

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2

paul at worldwithoutwalls dot co dot uk ¶

20 years ago

var_export() differs from print_r() for variables that are resources, with print_r() being more useful if you are using the function for debugging purposes.
e.g.
<?php
$res = mysql_connect($dbhost, $dbuser, $dbpass);
print_r($res); //output: Resource id #14
var_export($res); //output: NULL
?>

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1

me at peterkooi dot com ¶

27 days ago

A small function for exporting variables as string, supporting nested arrays, with indented output, blockquoted and with double quotes, that can be pasted back in code.

<?php
function dump($value) {
  function _dump($value, $indent = 0) {
    if (!is_array($value)) return json_encode($value, JSON_NUMERIC_CHECK);
    foreach($value as $key => $item) $result .= (ifset($result) ? ",\r\n" . str_repeat(" ", $indent + 2) : "") . json_encode($key) . " => " . _dump($item, $indent + 2);
    return "[\r\n" . str_repeat(" ", $indent + 2) . "$result\r\n" . str_repeat(" ", $indent) . "]";
  }
  return "<pre>" . htmlspecialchars(_dump($value)) . "</pre>";
}

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1

php_manual_note at bigredspark dot com ¶

21 years ago

[john holmes]

True, but that method would require you to open and read the file into a variable and then unserialize it into another variable.



Using a file created with var_export() could simply be include()'d, which will be less code and faster. 



[kaja]

If you are trying to find a way to temporarily save variables into some other file, check out serialize() and unserialize() instead - this one is more useful for its readable property, very handy while debugging.



[original post]

If you're like me, you're wondering why a function that outputs "correct PHP syntax" is useful. This function can be useful in implementing a cache system. You can var_export() the array into a variable and write it into a file. Writing a string such as



<?php

$string = '<?php $array = ' . $data . '; ?>';

?>



where $data is the output of var_export() can create a file that can be easily include()d back into the script to recreate $array. 



The raw output of var_export() could also be eval()d to recreate the array.



---John Holmes...

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0

rarioj at gmail dot com ¶

15 years ago

NOTE: If an object Foo has __set_state() method, but if that object contains another object Bar with no __set_state() method implemented, the resulting PHP expression will not be eval()-able.

This is an example (object Test that contains an instance of Exception).

<?php

class Test
{
  public $one;
  public $two;
  public function __construct($one, $two)
  {
    $this->one = $one;
    $this->two = $two;
  }
  public static function __set_state(array $array)
  {
    return new self($array['one'], $array['two']);
  }
}

$test = new Test('one', new Exception('test'));

$string = var_export($test, true);

/* $string =
Test::__set_state(array(
   'one' => 'one',
   'two' => 
  Exception::__set_state(array(
     'message' => 'test',
     'string' => '',
     'code' => 0,
     'file' => 'E:\\xampp\\htdocs\\test.Q.php',
     'line' => 35,
     'trace' => 
    array (
    ),
     'previous' => NULL,
  )),
))
*/

eval('$test2 = '.$string.';'); // Fatal error: Call to undefined method Exception::__set_state

?>

So avoid using var_export() on a complex array/object that contains other objects. Instead, use serialize() and unserialize() functions.

<?php

$string = 'unserialize('.var_export(serialize($test), true).')';

eval('$test2 = '.$string.';');

var_dump($test == $test2); // bool(true)

?>