如何阻止搜索查询少于3

Question

我正在为我的网站制作搜索功能，但我想阻止少于3个字符的搜索

if($search > 3){
    header('Location: error.txt');
}

它可能非常简单。请帮忙

Answer 1

您需要使用#include <stdio.h> void gettheline (int *length, char *line); void strreverse (char *begin, char *end); #define MAXLENGTH 1000 int main (void) { int length = 0; char line[MAXLENGTH] = ""; /* declare & initialize to zeros */ gettheline (&length, line); if (length) { printf ("line: %s (%d chars)\n", line, length); strreverse (line, line + length -1); printf (" rev: %s\n", line); } else fprintf (stderr, "error: line length is zero.\n"); return 0; } 来获取字符数。

$ echo "my dog has fleas" | ./bin/strrevgetchar
line: my dog has fleas  (16 chars)
 rev: saelf sah god ym