strcoll
The second parameter simply is the set of the "stop"-characters.
In other words, this function will return the index (starting from 0) of a first occurence of the stop-character.
strcspn
(PHP 4, PHP 5)
strcspn — Ermittelt die Anzahl der nicht übereinstimmenden Zeichen
Beschreibung
int strcspn
( string
$str1
, string $str2
[, int $start
[, int $length
]] )
Gibt die Länge von str1 zurück, bis zu der
kein Zeichen aus str2
vorkommt.
Parameter-Liste
-
str1 -
Die erste Zeichenkette.
-
str2 -
Die zweite Zeichenkette.
-
start -
Die Anfangsposition der zu untersuchenden Zeichenkette.
-
length -
Die Länge der zu untersuchenden Zeichenkette.
Rückgabewerte
Gibt die Länge des gefundenen Segments als Integerwert zurück.
Changelog
| Version | Beschreibung |
|---|---|
| 4.3.0 |
Die Parameter start und length
wurden eingeführt.
|
Beispiele
Beispiel #1 strcspn() Beispiel
<?php
$a = strcspn('abcd', 'apple');
$b = strcspn('abcd', 'banana');
$c = strcspn('hello', 'l');
$d = strcspn('hello', 'world');
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
int(0) int(0) int(2) int(2)
Anmerkungen
Hinweis: Diese Funktion ist binary safe.
Siehe auch
- strspn() - Ermittelt die Länge des initialen Abschnitts einer Zeichenkette, der ausschließlich aus Zeichen besteht, die in einer übergebenen Maske enthalten sind.
add a note
User Contributed Notes
strcspn - [6 notes]
Dmitry Mazur ¶
4 years ago
PHP at NospamImmortalSoFar dot com ¶
6 years ago
Also useful for breaking down expressions - for example parsing SQL: values ('this', fn("that,)()", 4))
$sep = strcspn ($list, "'\"`"); // Start of quoted string
$list = substr ($list, $sep);
$find = substr ($list, 0, 1);
while (($sep = strpos ($list, $find, $sep+1)) > 0 && substr ($list, $sep-1, 1) == '\\')
{}
// $sep now spans the entire string, regardless of embedded quotes
Once the strings have been removed, an expression can then be parsed for commas and brackets without worrying about them:
while ($out != '')
{
$sep = strcspn ($list, "(),"); // Next seperator
...
}
AT-HE (at_he AT hotmai1 DOT com) ¶
7 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";
}
?>
maskedcoder at hotmail dot com ¶
7 years ago
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.
legacyprog at routinz dot net ¶
2 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.
Anonymous ¶
3 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');
?>