nette-utils

Nette Utils

A collection of useful PHP utility classes for everyday tasks.

composer require nette/utils

For detailed references:

• Arrays, ArrayHash, ArrayList
• Strings and regex functions
• Image manipulation
• File searching with Finder

---

DateTime

Extended DateTime class with strict validation and DST fixes. There is also Nette\Utils\DateTimeImmutable (since 4.1.5) with the same API on top of \DateTimeImmutable — prefer it for new code, mutable date objects are a classic source of action-at-a-distance bugs.

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, forceArrays: true); // returns array (note the plural)

// 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

| Type | Description | |------|-------------| | int, float, bool, string, array, null | PHP types | | scalar | int\|float\|bool\|string | | list | indexed array | | number | int\|float | | numeric | number or numeric string | | unicode | valid UTF-8 string | | email, url, uri | format validation | | alnum, alpha, digit, lower, upper | character classes | | class, interface | existing class/interface | | file, directory | existing path |

---

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

Escaping is explicit and it is the one thing to get right here. setText() / addText() escape, setHtml() / addHtml() do not — reach for the Html variants only when the string is provably safe. add() escapes strings but inserts Html objects as they are.

class and style behave as arrays, which is what makes conditional markup readable — a null item is skipped, so no if is needed around it:

$el->class[] = 'active';
$el->class[] = $isTop ? 'top' : null;   // null is ignored
$el->style['color'] = 'green';
$el->data('config', ['a' => 1]);        // array is JSON-encoded

---

Process

Running external processes (since 4.1.4) — use this instead of exec(), shell_exec() or pulling in symfony/process.

use Nette\Utils\Process;

// No shell involved, arguments are passed as an array -> nothing to escape
$p = Process::runExecutable('git', ['log', '-1', '--format=%H']);
$p->ensureSuccess();              // returns void, do not chain
echo $p->getStdOutput();          // note the capital O

// Shell string: convenient for pipes, NEVER build it from untrusted input
$p = Process::runCommand('git log --oneline | head -n 20');

Both take $env, $options, $stdin, $stdout, $stderr, $directory and $timeout (default 60 s) — with that many parameters, pass them as named arguments (timeout: 30). Instance methods: wait(), isRunning(), getExitCode(), isSuccess(), ensureSuccess(), getStdOutput(), getStdError(), terminate(), detach(), getPid(). Reading output throws if it was redirected, discarded or piped instead of captured.

Callback

Working with PHP callables.

use Nette\Utils\Callback;

// Normalize to closure – use PHP itself, there is no Callback::closure() in Utils 4
$closure = $callable(...);
$closure = $obj->method(...);

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

// Invoke a native function and turn its warnings into an exception.
// First argument is a function NAME, not a callable; the handler gets (string $message, int $severity).
Callback::invokeSafe(
	'preg_match',
	[$pattern, $subject],
	fn(string $message) => throw new \RuntimeException($message),
);

// 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();         // false – only true for a SINGLE built-in type
$type->allows('null');      // true – there is no allowsNull() method
$type->isClass();           // false

---

SmartObject Trait

Getter/setter property access for classes. Its historical jobs are done by PHP itself now; for new code prefer PHP 8.4 property hooks. The trait is still useful for exposing getters as read-only properties.

The @property annotation is mandatory – without it the magic access throws MemberAccessException, because the trait only maps properties declared in the docblock.

use Nette\SmartObject;

/**
 * @property string $name
 */
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, use WebFetch on these URLs:

• Arrays – array helpers
• Strings – string functions and regex
• Images – image manipulation
• FileSystem – file operations
• Finder – file searching
• JSON – safe JSON handling
• Validators – type checking and validation