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Rechercher une fonction PHP

var_export

Contents

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

var_export — Outputs or returns a parsable string representation of a variable

Description

var_export ( mixed $expression [, bool $return = FALSE ] ) : mixed

var_export() gets structured information about the given variable. It is similar to var_dump() with one exception: the returned representation is valid PHP code.

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Parameters

expression

The variable you want to export.

return

If used and set to TRUE, var_export() will return the variable representation instead of outputting it.

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Return Values

Returns the variable representation when the return parameter is used and evaluates to TRUE. Otherwise, this function will return NULL.

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Notes

Note:

When the return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start() callback function.

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Changelog

Version Description
5.1.0 Possibility to export classes and arrays containing classes using the __set_state() magic method.

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Examples

Example #1 var_export() Examples

<?php
$a = array (1, 2, array ("a", "b", "c"));
var_export($a);
?>

The above example will output:

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

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

?>

The above example will output:

3.1

Example #2 Exporting classes since PHP 5.1.0

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

The above example will output:

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

Example #3 Using __set_state() (since PHP 5.1.0)

<?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);
?>

The above example will output:

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

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Notes

Note:

Variables of type resource couldn't be exported by this function.

Note:

var_export() does not handle circular references as it would be close to impossible to generate parsable PHP code for that. If you want to do something with the full representation of an array or object, use serialize().

Warning

When var_export() exports objects, the leading backslash is not included in the class name of namespaced classes for maximum compatibility.

Note:

To be able to evaluate the PHP generated by var_export(), all processed objects must implement the magic __set_state method. Note that StdClass does not implement __set_state().

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See Also

  • print_r() - Prints human-readable information about a variable
  • serialize() - Generates a storable representation of a value
  • var_dump() - Dumps information about a variable

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-function.var-export.html

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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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