I wouldn't overcomplicate it, something like:
Output:PHP Code:
#include "stdio.h"
#include "string.h"
int main() {
char *ips = "127.0.0.1 234.44.23.52 1.2.3.4";
char *test1 = "1.2.3.4";
char *test2 = "2.3.4.5";
printf("%s is %s in %s", test1, strstr(ips, test1) ? " " : " NOT ", ips);
printf("%s is %s in %s", test2, strstr(ips, test2) ? " " : " NOT ", ips);
}
And ips you can just get from a cvar?PHP Code:
1.2.3.4 is in 127.0.0.1 234.44.23.52 1.2.3.4
2.3.4.5 is NOT in 127.0.0.1 234.44.23.52 1.2.3.4