PHP マニュアル: Returns a short, readable, parsable string representation of a variable

説明

string var_representation(mixed $value, int $flags = 0)

var_representation (from the var_representation PECL) returns a string with structured information about the given variable. It is similar to var_export with differences in indentation, string escaping, and array representations.

パラメータ

value: The variable to generate a representation of.
flags: Bitmask consisting of VAR_REPRESENTATION_SINGLE_LINE, VAR_REPRESENTATION_UNESCAPED. The behaviour of these constants is described on the var_representation constants page.

戻り値

Returns the variable representation.

例

例1 var_representation Examples

<?php
$a = [1, 2, ['key' => 'value']];
echo var_representation($a), "\n";
echo var_representation($a, VAR_REPRESENTATION_SINGLE_LINE), "\n";
?>

上の例の出力は以下となります。

[
  1,
  2,
  [
    'key' => 'value',
  ],
]
[1, 2, ['key' => 'value']]

例2 Escaping control characters

<?php
echo var_representation("Content-Length: 123\r\n");

上の例の出力は以下となります。

"Content-Length: 123\r\n"

例3 Exporting stdClass

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

echo var_representation($person);

上の例の出力は以下となります。

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

例4 Exporting classes

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

上の例の出力は以下となります。

\A::__set_state([
  'var' => 5,
])

例5 Using __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('$b = ' . var_representation($a) . ';'); // $b = \A::__set_state([
                                              //   'var1' => 5,
                                              //   'var2' => 'foo',
                                              // ]);
var_dump($b);
?>

上の例の出力は以下となります。

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

参考

var_export