strcasecmp(3) - phpMan
STRCASECMP(3) Linux Programmer's Manual STRCASECMP(3)
strcasecmp, strncasecmp - compare two strings ignoring case
int strcasecmp(const char *s1, const char *s2);
int strncasecmp(const char *s1, const char *s2, size_t n);
The strcasecmp() function compares the two strings s1 and s2, ignoring the case of the
characters. It returns an integer less than, equal to, or greater than zero if s1 is
found, respectively, to be less than, to match, or be greater than s2.
The strncasecmp() function is similar, except it compares the only first n bytes of s1.
The strcasecmp() and strncasecmp() functions return an integer less than, equal to, or
greater than zero if s1 (or the first n bytes thereof) is found, respectively, to be less
than, to match, or be greater than s2.
The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD, where they were
declared in <string.h>. Thus, for reasons of historical compatibility, the glibc
<string.h> header file also declares these functions, if the _DEFAULT_SOURCE (or, in glibc
2.19 and earlier, _BSD_SOURCE) feature test macro is defined.
bcmp(3), memcmp(3), strcmp(3), strcoll(3), string(3), strncmp(3), wcscasecmp(3),
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