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# ChangeLog
All notable changes are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
## [3.1.5] - 2022-09-14
### Fixed
* [#47](https://github.com/sebastianbergmann/exporter/pull/47): Fix `float` export precision
## [3.1.4] - 2021-11-11
### Changed
* [#38](https://github.com/sebastianbergmann/exporter/pull/38): Improve export of closed resources
## [3.1.3] - 2020-11-30
### Changed
* Changed PHP version constraint in `composer.json` from `^7.0` to `>=7.0`
## [3.1.2] - 2019-09-14
### Fixed
* [#29](https://github.com/sebastianbergmann/exporter/pull/29): Second parameter for `str_repeat()` must be an integer
### Removed
* Remove HHVM-specific code that is no longer needed
[3.1.5]: https://github.com/sebastianbergmann/exporter/compare/3.1.4...3.1.5
[3.1.4]: https://github.com/sebastianbergmann/exporter/compare/3.1.3...3.1.4
[3.1.3]: https://github.com/sebastianbergmann/exporter/compare/3.1.2...3.1.3
[3.1.2]: https://github.com/sebastianbergmann/exporter/compare/3.1.1...3.1.2

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Exporter
Copyright (c) 2002-2021, Sebastian Bergmann <sebastian@phpunit.de>.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of Sebastian Bergmann nor the names of his
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

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Exporter
========
This component provides the functionality to export PHP variables for visualization.
## Usage
Exporting:
```php
<?php
use SebastianBergmann\Exporter\Exporter;
$exporter = new Exporter;
/*
Exception Object &0000000078de0f0d000000002003a261 (
'message' => ''
'string' => ''
'code' => 0
'file' => '/home/sebastianbergmann/test.php'
'line' => 34
'previous' => null
)
*/
print $exporter->export(new Exception);
```
## Data Types
Exporting simple types:
```php
<?php
use SebastianBergmann\Exporter\Exporter;
$exporter = new Exporter;
// 46
print $exporter->export(46);
// 4.0
print $exporter->export(4.0);
// 'hello, world!'
print $exporter->export('hello, world!');
// false
print $exporter->export(false);
// NAN
print $exporter->export(acos(8));
// -INF
print $exporter->export(log(0));
// null
print $exporter->export(null);
// resource(13) of type (stream)
print $exporter->export(fopen('php://stderr', 'w'));
// Binary String: 0x000102030405
print $exporter->export(chr(0) . chr(1) . chr(2) . chr(3) . chr(4) . chr(5));
```
Exporting complex types:
```php
<?php
use SebastianBergmann\Exporter\Exporter;
$exporter = new Exporter;
/*
Array &0 (
0 => Array &1 (
0 => 1
1 => 2
2 => 3
)
1 => Array &2 (
0 => ''
1 => 0
2 => false
)
)
*/
print $exporter->export(array(array(1,2,3), array("",0,FALSE)));
/*
Array &0 (
'self' => Array &1 (
'self' => Array &1
)
)
*/
$array = array();
$array['self'] = &$array;
print $exporter->export($array);
/*
stdClass Object &0000000003a66dcc0000000025e723e2 (
'self' => stdClass Object &0000000003a66dcc0000000025e723e2
)
*/
$obj = new stdClass();
$obj->self = $obj;
print $exporter->export($obj);
```
Compact exports:
```php
<?php
use SebastianBergmann\Exporter\Exporter;
$exporter = new Exporter;
// Array ()
print $exporter->shortenedExport(array());
// Array (...)
print $exporter->shortenedExport(array(1,2,3,4,5));
// stdClass Object ()
print $exporter->shortenedExport(new stdClass);
// Exception Object (...)
print $exporter->shortenedExport(new Exception);
// this\nis\na\nsuper\nlong\nstring\nt...\nspace
print $exporter->shortenedExport(
<<<LONG_STRING
this
is
a
super
long
string
that
wraps
a
lot
and
eats
up
a
lot
of
space
LONG_STRING
);
```
## Installation
You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
composer require sebastian/exporter
If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
composer require --dev sebastian/exporter

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{
"name": "sebastian/exporter",
"description": "Provides the functionality to export PHP variables for visualization",
"keywords": ["exporter","export"],
"homepage": "http://www.github.com/sebastianbergmann/exporter",
"license": "BSD-3-Clause",
"authors": [
{
"name": "Sebastian Bergmann",
"email": "sebastian@phpunit.de"
},
{
"name": "Jeff Welch",
"email": "whatthejeff@gmail.com"
},
{
"name": "Volker Dusch",
"email": "github@wallbash.com"
},
{
"name": "Adam Harvey",
"email": "aharvey@php.net"
},
{
"name": "Bernhard Schussek",
"email": "bschussek@gmail.com"
}
],
"config": {
"optimize-autoloader": true,
"sort-packages": true
},
"prefer-stable": true,
"require": {
"php": ">=7.0",
"sebastian/recursion-context": "^3.0"
},
"require-dev": {
"phpunit/phpunit": "^8.5",
"ext-mbstring": "*"
},
"autoload": {
"classmap": [
"src/"
]
},
"extra": {
"branch-alias": {
"dev-master": "3.1.x-dev"
}
}
}

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<?php declare(strict_types=1);
/*
* This file is part of exporter package.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Exporter;
use SebastianBergmann\RecursionContext\Context;
/**
* A nifty utility for visualizing PHP variables.
*
* <code>
* <?php
* use SebastianBergmann\Exporter\Exporter;
*
* $exporter = new Exporter;
* print $exporter->export(new Exception);
* </code>
*/
class Exporter
{
/**
* Exports a value as a string
*
* The output of this method is similar to the output of print_r(), but
* improved in various aspects:
*
* - NULL is rendered as "null" (instead of "")
* - TRUE is rendered as "true" (instead of "1")
* - FALSE is rendered as "false" (instead of "")
* - Strings are always quoted with single quotes
* - Carriage returns and newlines are normalized to \n
* - Recursion and repeated rendering is treated properly
*
* @param int $indentation The indentation level of the 2nd+ line
*
* @return string
*/
public function export($value, $indentation = 0)
{
return $this->recursiveExport($value, $indentation);
}
/**
* @param array<mixed> $data
* @param Context $context
*
* @return string
*/
public function shortenedRecursiveExport(&$data, Context $context = null)
{
$result = [];
$exporter = new self();
if (!$context) {
$context = new Context;
}
$array = $data;
$context->add($data);
foreach ($array as $key => $value) {
if (\is_array($value)) {
if ($context->contains($data[$key]) !== false) {
$result[] = '*RECURSION*';
} else {
$result[] = \sprintf(
'array(%s)',
$this->shortenedRecursiveExport($data[$key], $context)
);
}
} else {
$result[] = $exporter->shortenedExport($value);
}
}
return \implode(', ', $result);
}
/**
* Exports a value into a single-line string
*
* The output of this method is similar to the output of
* SebastianBergmann\Exporter\Exporter::export().
*
* Newlines are replaced by the visible string '\n'.
* Contents of arrays and objects (if any) are replaced by '...'.
*
* @return string
*
* @see SebastianBergmann\Exporter\Exporter::export
*/
public function shortenedExport($value)
{
if (\is_string($value)) {
$string = \str_replace("\n", '', $this->export($value));
if (\function_exists('mb_strlen')) {
if (\mb_strlen($string) > 40) {
$string = \mb_substr($string, 0, 30) . '...' . \mb_substr($string, -7);
}
} else {
if (\strlen($string) > 40) {
$string = \substr($string, 0, 30) . '...' . \substr($string, -7);
}
}
return $string;
}
if (\is_object($value)) {
return \sprintf(
'%s Object (%s)',
\get_class($value),
\count($this->toArray($value)) > 0 ? '...' : ''
);
}
if (\is_array($value)) {
return \sprintf(
'Array (%s)',
\count($value) > 0 ? '...' : ''
);
}
return $this->export($value);
}
/**
* Converts an object to an array containing all of its private, protected
* and public properties.
*
* @return array
*/
public function toArray($value)
{
if (!\is_object($value)) {
return (array) $value;
}
$array = [];
foreach ((array) $value as $key => $val) {
// Exception traces commonly reference hundreds to thousands of
// objects currently loaded in memory. Including them in the result
// has a severe negative performance impact.
if ("\0Error\0trace" === $key || "\0Exception\0trace" === $key) {
continue;
}
// properties are transformed to keys in the following way:
// private $property => "\0Classname\0property"
// protected $property => "\0*\0property"
// public $property => "property"
if (\preg_match('/^\0.+\0(.+)$/', (string) $key, $matches)) {
$key = $matches[1];
}
// See https://github.com/php/php-src/commit/5721132
if ($key === "\0gcdata") {
continue;
}
$array[$key] = $val;
}
// Some internal classes like SplObjectStorage don't work with the
// above (fast) mechanism nor with reflection in Zend.
// Format the output similarly to print_r() in this case
if ($value instanceof \SplObjectStorage) {
foreach ($value as $key => $val) {
$array[\spl_object_hash($val)] = [
'obj' => $val,
'inf' => $value->getInfo(),
];
}
}
return $array;
}
/**
* Recursive implementation of export
*
* @param mixed $value The value to export
* @param int $indentation The indentation level of the 2nd+ line
* @param \SebastianBergmann\RecursionContext\Context $processed Previously processed objects
*
* @return string
*
* @see SebastianBergmann\Exporter\Exporter::export
*/
protected function recursiveExport(&$value, $indentation, $processed = null)
{
if ($value === null) {
return 'null';
}
if ($value === true) {
return 'true';
}
if ($value === false) {
return 'false';
}
if (\is_float($value)) {
$precisionBackup = \ini_get('precision');
\ini_set('precision', '-1');
try {
$valueStr = (string) $value;
if ((string) (int) $value === $valueStr) {
return $valueStr . '.0';
}
return $valueStr;
} finally {
\ini_set('precision', $precisionBackup);
}
}
if ($this->isClosedResource($value)) {
return 'resource (closed)';
}
if (\is_resource($value)) {
return \sprintf(
'resource(%d) of type (%s)',
$value,
\get_resource_type($value)
);
}
if (\is_string($value)) {
// Match for most non printable chars somewhat taking multibyte chars into account
if (\preg_match('/[^\x09-\x0d\x1b\x20-\xff]/', $value)) {
return 'Binary String: 0x' . \bin2hex($value);
}
return "'" .
\str_replace(
'<lf>',
"\n",
\str_replace(
["\r\n", "\n\r", "\r", "\n"],
['\r\n<lf>', '\n\r<lf>', '\r<lf>', '\n<lf>'],
$value
)
) .
"'";
}
$whitespace = \str_repeat(' ', (int)(4 * $indentation));
if (!$processed) {
$processed = new Context;
}
if (\is_array($value)) {
if (($key = $processed->contains($value)) !== false) {
return 'Array &' . $key;
}
$array = $value;
$key = $processed->add($value);
$values = '';
if (\count($array) > 0) {
foreach ($array as $k => $v) {
$values .= \sprintf(
'%s %s => %s' . "\n",
$whitespace,
$this->recursiveExport($k, $indentation),
$this->recursiveExport($value[$k], $indentation + 1, $processed)
);
}
$values = "\n" . $values . $whitespace;
}
return \sprintf('Array &%s (%s)', $key, $values);
}
if (\is_object($value)) {
$class = \get_class($value);
if ($hash = $processed->contains($value)) {
return \sprintf('%s Object &%s', $class, $hash);
}
$hash = $processed->add($value);
$values = '';
$array = $this->toArray($value);
if (\count($array) > 0) {
foreach ($array as $k => $v) {
$values .= \sprintf(
'%s %s => %s' . "\n",
$whitespace,
$this->recursiveExport($k, $indentation),
$this->recursiveExport($v, $indentation + 1, $processed)
);
}
$values = "\n" . $values . $whitespace;
}
return \sprintf('%s Object &%s (%s)', $class, $hash, $values);
}
return \var_export($value, true);
}
/**
* Determines whether a variable represents a resource, either open or closed.
*
* @param mixed $actual The variable to test.
*
* @return bool
*/
private function isResource($value)
{
return $value !== null
&& \is_scalar($value) === false
&& \is_array($value) === false
&& \is_object($value) === false;
}
/**
* Determines whether a variable represents a closed resource.
*
* @param mixed $actual The variable to test.
*
* @return bool
*/
private function isClosedResource($value)
{
/*
* PHP 7.2 introduced "resource (closed)".
*/
if (\gettype($value) === 'resource (closed)') {
return true;
}
/*
* If gettype did not work, attempt to determine whether this is
* a closed resource in another way.
*/
$isResource = \is_resource($value);
$isNotNonResource = $this->isResource($value);
if ($isResource === false && $isNotNonResource === true) {
return true;
}
if ($isNotNonResource === true) {
try {
$resourceType = @\get_resource_type($value);
if ($resourceType === 'Unknown') {
return true;
}
} catch (TypeError $e) {
// Ignore. Not a resource.
} catch (Exception $e) {
// Ignore. Not a resource.
}
}
return false;
}
}