strtok

    (PHP 4, PHP 5, PHP 7, PHP 8)

    strtok — Tokenize string

    Descrição

    strtok(string$string, string$token): string|false

    Alternative signature (not supported with named arguments):

    strtok(string$token): string|false

    strtok() splits a string (string) into smaller strings (tokens), with each token being delimited by any character from token. That is, if you have a string like "This is an example string" you could tokenize this string into its individual words by using the space character as the token.

    Note that only the first call to strtok uses the string argument. Every subsequent call to strtok only needs the token to use, as it keeps track of where it is in the current string. To start over, or to tokenize a new string you simply call strtok with the string argument again to initialize it. Note that you may put multiple tokens in the token parameter. The string will be tokenized when any one of the characters in the token argument is found.

    Nota:

    This function behaves slightly different from what one may expect being familiar with explode(). First, a sequence of two or more contiguous token characters in the parsed string is considered to be a single delimiter. Also, a token situated at the start or end of the string is ignored. For example, if a string ";aaa;;bbb;" is used, successive calls to strtok() with ";" as a token would return strings "aaa" and "bbb", and then false. As a result, the string will be split into only two elements, while explode(";", $string) would return an array of 5 elements.

    Parâmetros

    string

    The string being split up into smaller strings (tokens).

    token

    The delimiter used when splitting up string.

    Valor Retornado

    A string token, or false if no more tokens are available.

    Registro de Alterações

    VersãoDescrição
    8.3.0 Now emits E_WARNING when token is not provided.

    Exemplos

    Exemplo #1 strtok() example

    <?php
    $string     = "This is\tan example\nstring";

    $tok = strtok($string, " \n\t");

    while (    $tok !== false) {
    echo     "Word=$tok<br />";
    $tok = strtok(" \n\t");
    }
    ?>

    Exemplo #2 strtok() behavior on empty part found

    <?php
    $first_token     = strtok('/something', '/');
    $second_token = strtok('/');
    var_dump($first_token, $second_token);
    ?>

    O exemplo acima produzirá:

    string(9) "something" bool(false)

    Exemplo #3 The difference between strtok() and explode()

    <?php
    $string     = ";aaa;;bbb;";

    $parts = [];
    $tok = strtok($string, ";");
    while (    $tok !== false) {
    $parts[] = $tok;
    $tok = strtok(";");
    }
    echo     json_encode($parts),"\n";

    $parts = explode(";", $string);
    echo     json_encode($parts),"\n";

    O exemplo acima produzirá:

    ["aaa","bbb"] ["","aaa","","bbb",""]

    Notas

    Aviso

    Esta função pode retornar o valor booleano false, mas também pode retornar um valor não booleano que pode ser avaliado como false. Leia a seção sobre Booleanos para mais informações. Use o operador === para testar o valor retornado por esta função.

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