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 internally uses the output buffering with this parameter so it can not be used inside 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

ВерсияОписание
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.

Смотрите также

var_dump()
print_r()