Yii Strings Helper

2.4.0 2023-12-22 07:29 UTC

This package is auto-updated.

Last update: 2024-05-22 14:28:54 UTC



Yii Strings

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The package provides:

  • StringHelper that has static methods to work with strings;
  • NumericHelper that has static methods to work with numeric strings;
  • Inflector provides methods such as toPlural() or toSlug() that derive a new string based on the string given;
  • WildcardPattern is a shell wildcard pattern to match strings against;
  • CombinedRegexp is a wrapper that optimizes multiple regular expressions matching and MemoizedCombinedRegexp is a decorator that caches results of CombinedRegexp to speed up matching.


  • PHP 8.0 or higher.
  • mbstring PHP extension.


The package could be installed with Composer:

composer require yiisoft/strings

StringHelper usage

String helper methods are static so usage is like the following:

echo \Yiisoft\Strings\StringHelper::countWords('Strings are cool!'); // 3

Overall the helper has the following method groups.


  • byteLength
  • byteSubstring

File paths

  • baseName
  • directoryName


  • substring
  • replaceSubstring
  • startsWith
  • startsWithIgnoringCase
  • endsWith
  • endsWithIgnoringCase
  • findBetween
  • findBetweenFirst
  • findBetweenLast


  • truncateBegin
  • truncateMiddle
  • truncateEnd
  • truncateWords
  • trim
  • ltrim
  • rtrim


  • length
  • countWords

Lowercase and uppercase

  • lowercase
  • uppercase
  • uppercaseFirstCharacter
  • uppercaseFirstCharacterInEachWord

URL friendly base64

  • base64UrlEncode
  • base64UrlDecode


  • parsePath
  • split

NumericHelper usage

Numeric helper methods are static so usage is like the following:

echo \Yiisoft\Strings\NumericHelper::toOrdinal(3); // 3rd

The following methods are available:

  • toOrdinal
  • normalize
  • isInteger

Inflector usage

echo (new \Yiisoft\Strings\Inflector())
    ->toSlug('Strings are cool!'); // strings-are-cool

Overall the inflector has the following method groups.

Plurals and singulars

  • toPlural
  • toSingular


  • toTransliterated

Case conversion

  • pascalCaseToId
  • toPascalCase
  • toCamelCase

Words and sentences

  • toSentence
  • toWords
  • toHumanReadable

Classes and database tables

  • classToTable
  • tableToClass


  • toSlug

WildcardPattern usage

WildcardPattern allows a simple POSIX-style string matching.

use \Yiisoft\Strings\WildcardPattern;

$startsWithTest = new WildcardPattern('test*');
if ($startsWithTest->match('testIfThisIsTrue')) {
    echo 'It starts with "test"!';

The following characters are special in the pattern:

  • \ escapes other special characters if usage of escape character is not turned off.
  • * matches any string, including the empty string, except delimiters (/ and \ by default).
  • ** matches any string, including the empty string and delimiters.
  • ? matches any single character.
  • [seq] matches any character in seq.
  • [a-z] matches any character from a to z.
  • [!seq] matches any character not in seq.
  • [[:alnum:]] matches POSIX style character classes.

ignoreCase() could be called before doing a match() to get a case-insensitive match:

use \Yiisoft\Strings\WildcardPattern;

$startsWithTest = new WildcardPattern('test*');
if ($startsWithTest
    ->match('tEStIfThisIsTrue')) {
    echo 'It starts with "test"!';

CombinedRegexp usage

CombinedRegexp optimizes matching multiple regular expressions.

use \Yiisoft\Strings\CombinedRegexp;

$patterns = [
$regexp = new CombinedRegexp($patterns, 'i');
$regexp->matches('a5'); // true – matches the third pattern
$regexp->matches('A5'); // true – matches the third pattern because of `i` flag that is applied to all regular expressions
$regexp->getMatchingPattern('a5'); // '^a\d$' – the pattern that matched
$regexp->getMatchingPatternPosition('a5'); // 2 – the index of the pattern in the array
$regexp->getCompiledPattern(); // '~(?|first|second()|^a\d$()())~'

MemoizedCombinedRegexp usage

MemoizedCombinedRegexp caches results of CombinedRegexp in memory. It is useful when the same incoming string are matching multiple times or different methods of CombinedRegexp are called.

use \Yiisoft\Strings\CombinedRegexp;
use \Yiisoft\Strings\MemoizedCombinedRegexp;

$patterns = [
$regexp = new MemoizedCombinedRegexp(new CombinedRegexp($patterns, 'i'));
$regexp->matches('a5'); // Fires `preg_match` inside the `CombinedRegexp`.
$regexp->matches('first'); // Fires `preg_match` inside the `CombinedRegexp`.
$regexp->matches('a5'); // Does not fire `preg_match` inside the `CombinedRegexp` because the result is cached.
$regexp->getMatchingPattern('a5'); // The result is cached so no `preg_match` is fired.
$regexp->getMatchingPatternPosition('a5'); // The result is cached so no `preg_match` is fired.

// The following code fires only once matching mechanism.
if ($regexp->matches('second')) {
    echo sprintf(
        'Matched the pattern "%s" which is on the position "%s" in the expressions list.',


If you need help or have a question, the Yii Forum is a good place for that. You may also check out other Yii Community Resources.


The Yii Strings is free software. It is released under the terms of the BSD License. Please see LICENSE for more information.

Maintained by Yii Software.

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