useful for finding beginning of quotes and/or tags in a variable containing html.
$pos = strcspn($data, '<"\'');
will find the first occurance of either the beginning of a tag, or a double- or single-quoted string.
strcspn
(PHP 4, PHP 5, PHP 7, PHP 8)
strcspn — Encontra o tamanho do segmento inicial que não contenha a máscara
Descrição
strcspn
( string
$str1
, string $str2
, int $start = ?
, int $length = ?
) : int
Retorna o tamanho do segmento inicial de
str1 que não
contém nenhum dos caracteres em str2.
Parâmetros
-
str1 -
A primeira string.
-
str2 -
A segunda string.
-
start -
A posição inicial da string.
-
length -
O tamanho da string.
Valor Retornado
Retorna o tamanho do segmento como um inteiro.
Changelog
| Versão | Descrição |
|---|---|
| 4.3.0 |
O start e length
foram adicionados
|
Notas
Nota: Esta função é binary-safe.
add a note
User Contributed Notes 5 notes
maskedcoder at hotmail dot com ¶
18 years ago
AT-HE (at_he AT hotmai1 DOT com) ¶
18 years ago
this function can be used like strspn(), except while that can be used to compare a string with an allowed pattern, this one can be use to compare a string with a FORBIDDEN pattern
so, to know if any forbidden character has a position inside our string, we can use (not tested with backslashes)...
<?php
// LARGE VERSION
$forbidden="\"\\?*:/@|<>";
if (strlen($filename) != strcspn($filename,$forbidden)) {
echo "you cant create a file with that name!";
}
// SHORT VERSION
if (strlen($filename) - strcspn($filename,"\"\\?*:/@|<>")) {
echo "i told you, you cant create that file";
}
?>
legacyprog at routinz dot net ¶
13 years ago
When you use the third parameter remember that the function will return the number of characters it bypassed, which will *not* be the position in your source string. It's a simple fix to just add your third parameter value to the function result to get the position in the first string where the scan stopped, but I didn't think of it at first.
nospam at nospam dot com ¶
7 years ago
It might not be clear from the example, that
strcspn('abcdhelloabcd', 'abcd', -9, -5) == 4
because it's only evaluating 'hell' which doesn't contain any mask, so returns strlen('hell').
Anonymous ¶
14 years ago
strcspn() can also be thought of as analogous to the following regular expression:
<?php
// where ... represents the mask of characters
preg_match('/[^ ...]/', substr($subject, $start, $length) );
?>
By this analogy, strcspn() can be used in place of some regular expressions to match a pattern without the overhead of a regex engine -- for example, ways to verify if an input string represents a binary value:
<?php
preg_match('/^[01]+$/i', $subject);
// or...
!preg_match('/[^01]/i', $subject);
// ...or using strcspn()
!strcspn($subject, '01');
?>
