1 PHP_FUNCTION(ucwords) 2 { 3     zend_string *str; 4     char *delims = " \t\r\n\f\v"; 5     register char *r, *r_end; 6     size_t delims_len = 6; 7     char mask[256]; 8  9     ZEND_PARSE_PARAMETERS_START(1, 2)10         Z_PARAM_STR(str)11         Z_PARAM_OPTIONAL12         Z_PARAM_STRING(delims, delims_len)13     ZEND_PARSE_PARAMETERS_END();14 15     if (!ZSTR_LEN(str)) {16         RETURN_EMPTY_STRING();17     }18 19     php_charmask((unsigned char *)delims, delims_len, mask); // 初始化mask数组，并对上述6个字符执行类似这样的操作：char c='\t';mask[c]=1;20 21     ZVAL_STRINGL(return_value, ZSTR_VAL(str), ZSTR_LEN(str)); //初始化函数返回值return_value22     r = Z_STRVAL_P(return_value); //新字符串首地址23 24     *r = toupper((unsigned char) *r); //将新字符串首字符大写转换25     for (r_end = r + Z_STRLEN_P(return_value) - 1; r < r_end; ) {
   //一次遍历每个字符26         if (mask[(unsigned char)*r++]) { // 字符如果是上述6个之一，则该字符后面的字符进行大写转换27             *r = toupper((unsigned char) *r);28         }29     }30     //结束之后，将返回return_value31 }