strcspn(3) [osf1 man page]
strspn(3) Library Functions Manual strspn(3) NAME
strcspn, strspn - Returns length of initial segment of string LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <string.h> size_t strcspn( const char *s1, const char *s2); size_t strspn( const char *s1, const char *s2); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: strcspn(), strspn(): XSH4.2 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Points to a character string being checked for an initial segment. Points to a string containing a set of bytes that define the initial segment. DESCRIPTION
The strspn() function computes the length of the maximum initial segment of the string pointed to by the s1 parameter, which consists entirely of bytes from the string pointed to by the s2 parameter. The strcspn() function computes the byte length of the maximum initial segment of the string pointed to by the s1 parameter, which consists entirely of bytes that are not from the string pointed to by the s2 parameter. The strspn() and strcspn() functions treat the s2 parameter as a series of bytes; these functions do not treat a multibyte character as a single unit but rather as a series of separate bytes. There are no equivalent functions for multibyte character strings. The wcsspn() and wcscspn() functions provide the same functionality for wide character strings. RETURN VALUES
Upon successful completion, the strcspn(), and strspn() functions return the length of the string segment. [Tru64 UNIX] On error, a value of -1 cast to size_t is returned. RELATED INFORMATION
Functions: string(3), wcsspn(3)/wcscspn(3) Standards: standards(5) delim off strspn(3)
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STRSPN(3) 1 STRSPN(3) strspn - Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask. SYNOPSIS
int strspn (string $subject, string $mask, [int $start], [int $length]) DESCRIPTION
Finds the length of the initial segment of $subject that contains only characters from $mask. If $start and $length are omitted, then all of $subject will be examined. If they are included, then the effect will be the same as call- ing strspn(substr($subject, $start, $length), $mask) (see "substr" for more information). The line of code: <?php $var = strspn("42 is the answer to the 128th question.", "1234567890"); ?> 2 to $var, because the string "42" is the initial segment of $subject that consists only of characters contained within "1234567890". PARAMETERS
o $subject - The string to examine. o $mask - The list of allowable characters. o $start - The position in $subject to start searching. If $start is given and is non-negative, then strspn(3) will begin examining $sub- ject at the $start'th position. For instance, in the string ' abcdef', the character at position 0 is ' a', the character at posi- tion 2 is ' c', and so forth. If $start is given and is negative, then strspn(3) will begin examining $subject at the $start'th position from the end of $subject. o $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. RETURN VALUES
Returns the length of the initial segment of $subject which consists entirely of characters in $mask. EXAMPLES
Example #1 strspn(3) example <?php // subject does not start with any characters from mask var_dump(strspn("foo", "o")); // examine two characters from subject starting at offset 1 var_dump(strspn("foo", "o", 1, 2)); // examine one character from subject starting at offset 1 var_dump(strspn("foo", "o", 1, 1)); ?> The above example will output: int(0) int(2) int(1) NOTES
Note This function is binary-safe. SEE ALSO
strcspn(3). PHP Documentation Group STRSPN(3)