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Nette Utils

A collection of useful PHP utility classes for everyday tasks.

composer require nette/utils

For detailed references:

• arrays.md - Arrays, ArrayHash, ArrayList
• strings.md - Strings and regex functions
• image.md - Image manipulation
• finder.md - File searching

DateTime

Extended DateTime class with strict validation and DST fixes.

use Nette\Utils\DateTime;

// Create from various formats
DateTime::from(1138013640);              // from timestamp
DateTime::from('2024-02-26 04:15:32');   // from string
DateTime::from($dateTimeInterface);       // from object

// Create from parts (throws on invalid date)
DateTime::fromParts(2024, 2, 26, 4, 15);

// Immutable modification
$clone = $original->modifyClone('+1 day');

// Convert relative time to seconds
DateTime::relativeToSeconds('10 minutes'); // 600
DateTime::relativeToSeconds('-1 hour');    // -3600

// JSON serialization (ISO 8601)
echo json_encode($dateTime); // "2024-02-26T04:15:32+01:00"

Json

Safe JSON encoding/decoding with exceptions.

use Nette\Utils\Json;

// Encode
$json = Json::encode($data);
$json = Json::encode($data, pretty: true);        // formatted
$json = Json::encode($data, asciiSafe: true);     // escape unicode
$json = Json::encode($data, htmlSafe: true);      // escape < > &
$json = Json::encode($data, forceObjects: true);  // arrays as objects

// Decode
$data = Json::decode($json);                    // returns stdClass
$data = Json::decode($json, forceArray: true);  // returns array

// Both throw Nette\Utils\JsonException on error

Validators

Value validation and type checking.

use Nette\Utils\Validators;

// Type checking
Validators::is($value, 'int');              // true/false
Validators::is($value, 'int|string|bool');  // union types
Validators::is($value, 'int:0..100');       // range
Validators::is($value, 'string:10..20');    // length range
Validators::is($value, 'array:1..5');       // count range

// Specific validators
Validators::isEmail('user@example.com');    // true
Validators::isUrl('https://nette.org');     // true
Validators::isUri('mailto:info@nette.org'); // true
Validators::isNumeric('123');               // true (string number)
Validators::isNumericInt('123');            // true (string integer)
Validators::isUnicode($string);             // valid UTF-8?
Validators::isInRange($value, [0, 100]);    // in range?
Validators::isNone($value);                 // 0, '', false, null, []?

// Assertion (throws on failure)
Validators::assert($value, 'string:5..10');
Validators::assertField($array, 'key', 'int');

Expected Types

FileSystem

File operations with exception handling.

use Nette\Utils\FileSystem;

// Read/Write
$content = FileSystem::read('/path/to/file');
FileSystem::write('/path/to/file', $content);

// Read large files line by line
foreach (FileSystem::readLines('/path/to/file') as $line) {
    echo $line;
}

// Copy/Move/Delete
FileSystem::copy($source, $target);
FileSystem::rename($source, $target);
FileSystem::delete($path);  // works on directories too

// Directory operations
FileSystem::createDir('/path/to/dir');
FileSystem::makeWritable('/path');

// Path utilities
FileSystem::isAbsolute('../path');                    // false
FileSystem::normalizePath('/file/../path');           // '/path'
FileSystem::joinPaths('a', 'b', 'file.txt');          // 'a/b/file.txt'
FileSystem::resolvePath('/base', '../file.txt');      // '/file.txt'
FileSystem::unixSlashes('path\\to\\file');            // 'path/to/file'

Floats

Safe floating-point comparisons.

use Nette\Utils\Floats;

// Compare floats (handles precision issues)
Floats::isZero(0.0);                    // true
Floats::areEqual(0.1 + 0.2, 0.3);       // true (!)
Floats::isLessThan($a, $b);
Floats::isLessThanOrEqualTo($a, $b);
Floats::isGreaterThan($a, $b);
Floats::isGreaterThanOrEqualTo($a, $b);

// Compare with result
Floats::compare($a, $b);  // -1, 0, or 1

Random

Cryptographically secure random values.

use Nette\Utils\Random;

// Random string (default: 0-9, a-z)
Random::generate(10);                    // 'a4b3c2d1e0'
Random::generate(10, 'A-Z');             // 'XYZABCDEF'
Random::generate(10, '0-9A-Za-z');       // 'aB3cD4eF5g'
Random::generate(10, 'A-Za-z!@#$%');     // 'aBc!@Def#$'

Paginator

Pagination calculations.

use Nette\Utils\Paginator;

$paginator = new Paginator;
$paginator->setItemCount(100);  // total items
$paginator->setItemsPerPage(10);
$paginator->setPage(3);

echo $paginator->getPageCount();    // 10
echo $paginator->getOffset();       // 20 (for SQL OFFSET)
echo $paginator->getLength();       // 10 (for SQL LIMIT)
echo $paginator->isFirst();         // false
echo $paginator->isLast();          // false

Html

HTML element builder.

use Nette\Utils\Html;

// Create element
$el = Html::el('a', ['href' => 'https://nette.org']);
$el->setText('Nette');
echo $el;  // <a href="https://nette.org">Nette</a>

// Fluent interface
$el = Html::el('div')
    ->id('container')
    ->class('main active')
    ->data('id', 123)
    ->setHtml('<p>Content</p>');

// Shorthand
Html::el('input', ['type' => 'text', 'name' => 'email']);
Html::el('div class="box"');  // from string

Callback

Working with PHP callables.

use Nette\Utils\Callback;

// Normalize to closure
$closure = Callback::closure($callable);
$closure = Callback::closure($obj, 'method');
$closure = Callback::closure('Class::method');

// Check validity
Callback::check($callable);  // throws if invalid

// Invoke with exception wrapping
Callback::invokeSafe($callable, $args, $onError);

// Reflection
$reflection = Callback::toReflection($callable);

Type

PHP type utilities.

use Nette\Utils\Type;

// Get type from reflection
$type = Type::fromReflection($reflectionProperty);
$type = Type::fromReflection($reflectionParameter);

// Parse type string
$type = Type::fromString('int|string|null');

// Type info
$type->getSingleName();     // 'int' or null if union
$type->getNames();          // ['int', 'string', 'null']
$type->isUnion();           // true
$type->isIntersection();    // false
$type->isBuiltin();         // true
$type->allowsNull();        // true
$type->isClass();           // false

SmartObject Trait

Modern PHP object features for classes.

use Nette\SmartObject;

class MyClass
{
    use SmartObject;

    private string $name;

    public function getName(): string
    {
        return $this->name;
    }

    public function setName(string $name): void
    {
        $this->name = $name;
    }
}

$obj = new MyClass;
$obj->name = 'John';    // calls setName()
echo $obj->name;        // calls getName()

Online Documentation

For detailed information, fetch from doc.nette.org:

• Utils
• Arrays
• Strings
• DateTime
• FileSystem
• Finder
• Images
• JSON
• Validators