Variable handling Функции
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Variable handling Функции
PHP Manual

# var_export

(PHP 4 >= 4.2.0, PHP 5)

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

### Описание

mixed var_export ( mixed `$expression` [, bool `$return` ] )

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.

### Список параметров

`expression`

  The variable you want to export.

`return`

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

  > Замечание: This function uses internal output buffering with this parameter so it can not be used inside an ob_start() callback function.

### Возвращаемые значения

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

### Список изменений

Версия | Описание
--- | ---
5.1.0 | Possibility to export classes and arrays containing classes using the __set_state magic method.

### Примеры

Пример #1 var_export() Examples

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

Результат выполнения данного примера:

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

`<?php
$b = 3.1;
$v = var_export($b, true);
echo $v;
?>`

Результат выполнения данного примера:

    3.1

Пример #2 Exporting classes since PHP 5.1.0

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

Результат выполнения данного примера:

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

Пример #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);
?>`

Результат выполнения данного примера:

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

### Примечания

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

> Замечание: 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().

### Смотрите также

- print_r()
- serialize()
- var_dump()

Variable handling Функции
Web Services
Variable handling Функции
PHP Manual