php随机a-z,php生成区间字母，A-Z或者A-AZ，或者B-CC等等任意组合

$v = createStartToEnd("A","AZ");

print_r($v);

function createStartToEnd($s='',$e='')

{

$_start = $s;

$_end = $e;

$_start = strtoupper($_start);

$_end = strtoupper($_end);

$startlen = strlen($_start);

$endlen = strlen($_end);

$startsubstr =substr($_start, -1);

$substr =substr($_end, -1);

if ($startlen > 2 || $endlen > 2) {

echo '最大2位字母组合';

return;

}elseif ($startlen > $endlen) {

echo '开始字母数量不能大于结束字母数量';

return;

}elseif ($startlen ==1 && $endlen ==1) {

$startord =ord($_start);

$strord =ord($_end);

if ($str < $_start) {

echo '开始字母顺序不能排在结束字母之后';

return;

}

}elseif ($startlen ==2 && $endlen ==2) {

//第一位判断

$firststartstr = substr($_start,0,$startlen-1);

$firstendstr = substr($_end,0,$endlen-1);

$firststartord =ord($firststartstr);

$firstendord =ord($firstendstr);

if ($firstendord < $firststartord) {

echo '开始字母顺序不能排在结束字母之后';

return;

}

//第二位判断

$startord =ord($startsubstr);

$strord =ord($substr);

if ($strord < $startord) {

echo '开始字母顺序不能排在结束字母之后';

return;

}

}

if ($endlen >1 && $substr == 'Z') {

$firststr = substr($_end,0,$endlen-1);

$newfirststr = chr(ord($firststr)+1);

$key = $newfirststr."A";

}elseif ($endlen >1 && $substr != 'Z') {

$firststr = substr($_end,0,$endlen-1);

$substr = chr(ord($substr)+1);

$key = $firststr.$substr;

}

if($endlen == 1 && $substr == 'Z'){

$key = "AA";

}elseif($endlen == 1 && $substr != 'Z'){

$key = chr(ord($substr)+1);

}

for($i = $_start; $i != $key; $i++)

{

$result[] = $i;

}

return $result;

}