(PHP 4, PHP 5, PHP 7)
strcspn — Find length of initial segment not matching mask
$subject
, string $mask
[, int $start
[, int $length
]] )
Returns the length of the initial segment of
subject which does not
contain any of the characters in mask.
If start and length
are omitted, then all of subject will be
examined. If they are included, then the effect will be the same as
calling strcspn(substr($subject, $start, $length),
$mask) (see substr
for more information).
subjectThe string to examine.
maskThe string containing every disallowed character.
start
The position in subject to
start searching.
If start is given and is non-negative,
then strcspn() will begin
examining subject at
the start'th position. For instance, in
the string 'abcdef', the character at
position 0 is 'a', the
character at position 2 is
'c', and so forth.
If start is given and is negative,
then strcspn() will begin
examining subject at
the start'th position from the end
of subject.
length
The length of the segment from subject
to examine.
If length is given and is non-negative,
then subject will be examined
for length characters after the starting
position.
If length is given and is negative,
then subject will be examined from the
starting position up to length
characters from the end of subject.
Returns the length of the initial segment of subject
which consists entirely of characters not in mask.
Note:
When a
startparameter is set, the returned length is counted starting from this position, not from the beginning ofsubject.
Example #1 strcspn() example
<?php
$a = strcspn('abcd', 'apple');
$b = strcspn('abcd', 'banana');
$c = strcspn('hello', 'l');
$d = strcspn('hello', 'world');
$e = strcspn('abcdhelloabcd', 'abcd', -9);
$f = strcspn('abcdhelloabcd', 'abcd', -9, -5);
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
var_dump($f);
?>
The above example will output:
int(0) int(0) int(2) int(2) int(5) int(4)
Note: This function is binary-safe.