str_pad() 将字符串填充成指定长度的字符串
/**
* 将字符串填充成指定长度的字符串(多字节安全)
* @param string $str 指定被填充的字符串
* @param int $len 指定被填充的字符串的长度,如果值为负数或小于字符串的长度则不填充
* @param string $pad_str 要填充的字符串
* @param int $pad_type 指定填充的方向STR_PAD_RIGHT,STR_PAD_LEFT或STR_PAD_BOTH
* @return string
*/
// string str_pad(string $str, int $len, string $pad_str, string $pad_type);
echo str_pad($result2[0],6,"0",STR_PAD_LEFT);

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