(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.0)

grapheme_substrReturn part of a string


Stile procedurale

grapheme_substr(string $string, int $offset, ?int $length = null): string|false

Return part of a string

Elenco dei parametri


The input string. Must be valid UTF-8.


Start position in default grapheme units. If offset is non-negative, the returned string will start at the offset'th position in string, counting from zero. If offset is negative, the returned string will start at the offset'th grapheme unit from the end of string.


Length in grapheme units. If length is given and is positive, the string returned will contain at most length grapheme units beginning from offset (depending on the length of string). If length is given and is negative, then that many grapheme units will be omitted from the end of string (after the start position has been calculated when offset is negative). If offset denotes a position beyond this truncation, an empty string will be returned.

Valori restituiti

Returns the extracted part of string, o false in caso di fallimento.

Log delle modifiche

Versione Descrizione
8.0.0 The function now consistently clamps out-of-bounds offsets to the string boundary. Previously, false was returned instead of the empty string in some cases.


Example #1 grapheme_substr() example


"a\xCC\x8A";  // 'LATIN SMALL LETTER A WITH RING ABOVE' (U+00E5) normalization form "D"
$char_o_diaeresis_nfd "o\xCC\x88"// 'LATIN SMALL LETTER O WITH DIAERESIS' (U+00F6) normalization form "D"

print urlencode(grapheme_substr"ao" $char_a_ring_nfd "bc" $char_o_diaeresis_nfd "O"2, -));

Il precedente esempio visualizzerĂ :


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