The IntlBreakIterator class

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

Introduction

A “break iterator” is an ICU object that exposes methods for locating boundaries in text (e.g. word or sentence boundaries). The PHP IntlBreakIterator serves as the base class for all types of ICU break iterators. Where extra functionality is available, the intl extension may expose the ICU break iterator with suitable subclasses, such as IntlRuleBasedBreakIterator or IntlCodePointBreakIterator.

This class implements IteratorAggregate. Traversing an IntlBreakIterator yields non-negative integer values representing the successive locations of the text boundaries, expressed as UTF-8 code units (byte) counts, taken from the beginning of the text (which has the location 0). The keys yielded by the iterator simply form the sequence of natural numbers {0, 1, 2, …}.

Class synopsis

class IntlBreakIterator implements IteratorAggregate {

/* Constants */

public const int DONE;

public const int WORD_NONE;

public const int WORD_NONE_LIMIT;

public const int WORD_NUMBER;

public const int WORD_NUMBER_LIMIT;

public const int WORD_LETTER;

public const int WORD_LETTER_LIMIT;

public const int WORD_KANA;

public const int WORD_KANA_LIMIT;

public const int WORD_IDEO;

public const int WORD_IDEO_LIMIT;

public const int LINE_SOFT;

public const int LINE_SOFT_LIMIT;

public const int LINE_HARD;

public const int LINE_HARD_LIMIT;

public const int SENTENCE_TERM;

public const int SENTENCE_TERM_LIMIT;

public const int SENTENCE_SEP;

public const int SENTENCE_SEP_LIMIT;

/* Methods */

private __construct()

public static createCharacterInstance(?string $locale = null): ?IntlBreakIterator

public static createCodePointInstance(): IntlCodePointBreakIterator

public static createLineInstance(?string $locale = null): ?IntlBreakIterator

public static createSentenceInstance(?string $locale = null): ?IntlBreakIterator

public static createTitleInstance(?string $locale = null): ?IntlBreakIterator

public static createWordInstance(?string $locale = null): ?IntlBreakIterator

public current(): int

public first(): int

public following(int $offset): int

public getErrorCode(): int

public getErrorMessage(): string

public getLocale(int $type): string|false

public getPartsIterator(string $type = IntlPartsIterator::KEY_SEQUENTIAL): IntlPartsIterator

public getText(): ?string

public isBoundary(int $offset): bool

public last(): int

public next(?int $offset = null): int

public preceding(int $offset): int

public previous(): int

public setText(string $text): bool

}

Predefined Constants

IntlBreakIterator::DONE
IntlBreakIterator::WORD_NONE
IntlBreakIterator::WORD_NONE_LIMIT
IntlBreakIterator::WORD_NUMBER
IntlBreakIterator::WORD_NUMBER_LIMIT
IntlBreakIterator::WORD_LETTER
IntlBreakIterator::WORD_LETTER_LIMIT
IntlBreakIterator::WORD_KANA
IntlBreakIterator::WORD_KANA_LIMIT
IntlBreakIterator::WORD_IDEO
IntlBreakIterator::WORD_IDEO_LIMIT
IntlBreakIterator::LINE_SOFT
IntlBreakIterator::LINE_SOFT_LIMIT
IntlBreakIterator::LINE_HARD
IntlBreakIterator::LINE_HARD_LIMIT
IntlBreakIterator::SENTENCE_TERM
IntlBreakIterator::SENTENCE_TERM_LIMIT
IntlBreakIterator::SENTENCE_SEP
IntlBreakIterator::SENTENCE_SEP_LIMIT

Changelog

Version	Description
8.0.0	IntlBreakIterator implements IteratorAggregate now. Previously, Traversable was implemented instead.

IntlBreakIterator::__construct — Private constructor for disallowing instantiation
IntlBreakIterator::createCharacterInstance — Create break iterator for boundaries of combining character sequences
IntlBreakIterator::createCodePointInstance — Create break iterator for boundaries of code points
IntlBreakIterator::createLineInstance — Create break iterator for logically possible line breaks
IntlBreakIterator::createSentenceInstance — Create break iterator for sentence breaks
IntlBreakIterator::createTitleInstance — Create break iterator for title-casing breaks
IntlBreakIterator::createWordInstance — Create break iterator for word breaks
IntlBreakIterator::current — Get index of current position
IntlBreakIterator::first — Set position to the first character in the text
IntlBreakIterator::following — Advance the iterator to the first boundary following specified offset
IntlBreakIterator::getErrorCode — Get last error code on the object
IntlBreakIterator::getErrorMessage — Get last error message on the object
IntlBreakIterator::getLocale — Get the locale associated with the object
IntlBreakIterator::getPartsIterator — Create iterator for navigating fragments between boundaries
IntlBreakIterator::getText — Get the text being scanned
IntlBreakIterator::isBoundary — Tell whether an offset is a boundaryʼs offset
IntlBreakIterator::last — Set the iterator position to index beyond the last character
IntlBreakIterator::next — Advance the iterator the next boundary
IntlBreakIterator::preceding — Set the iterator position to the first boundary before an offset
IntlBreakIterator::previous — Set the iterator position to the boundary immediately before the current
IntlBreakIterator::setText — Set the text being scanned

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User Contributed Notes 1 note

down

SenseException ¶

10 years ago


Since there is no excample for the usage of the IntlBreakIterator yet, I made a small one:

<?php

$text = "Si contano i danni. Un morto a Roma, un treno ".
"deragliato e quattro feriti a Foggia, strade chiuse in tutto ".
"il sud, allagamenti e danni sulla costa ionica. A Pescara, ".
"1.500 sfollati per l'esondazione del Fosso Vallelunga. ".
"Dall'inizio dell'anno l'agricoltura ha subito un miliardo ".
"di euro di danni.";

$locale = 'it_IT';

$i = IntlBreakIterator::createSentenceInstance($locale);
$i->setText($text);

foreach($i->getPartsIterator() as $sentence) {
    echo $sentence . PHP_EOL . '----- next -----' .  PHP_EOL;
}

?>

Result:

Si contano i danni. 
----- next -----
Un morto a Roma, un treno deragliato e quattro feriti a Foggia, strade chiuse in tutto il sud, allagamenti e danni sulla costa ionica. 
----- next -----
A Pescara, 1.500 sfollati per l'esondazione del Fosso Vallelunga. 
----- next -----
Dall'inizio dell'anno l'agricoltura ha subito un miliardo di euro di danni.
----- next -----