strcspn

Find length of initial segment not matching mask

Syntax

strcspn ( string $subject , string $mask [, int $start [, int $length ]] ) : int

Parameters

subject

The string to examine.

mask

The 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.

<?

$subject = "12345abcde12345abcde";
$mask = "abcde";

$return = strcspn($subject, $mask);

echo $return;

?>

2 · start · Negative

<?

$subject = "12345abcde12345abcde";
$mask = "abcde";
$start = -10;

$return = strcspn($subject, $mask, $start);

echo $return;

?>

3 · start · Non-negative

<?

$subject = "12345abcde12345abcde";
$mask = "abcde";
$start = 10;

$return = strcspn($subject, $mask, $start);

echo $return;

?>

4 · length · Negative

<?

$subject = "12345abcde12345abcde";
$mask = "abcde";
$start = -10;
$length = -5;

$return = strcspn($subject, $mask, $start, $length);

echo $return;

?>

5 · length · Non-negative

<?

$subject = "12345abcde12345abcde";
$mask = "abcde";
$start = 10;
$length = 5;

$return = strcspn($subject, $mask, $start, $length);

echo $return;

?>

Syntax

Parameters

Return

Examples

1 · subject mask

2 · start · Negative

3 · start · Non-negative

4 · length · Negative

5 · length · Non-negative

Links

String

External