PHP中64位整数的二进制值的base64编码不起作用

Question

How to use base64 encoding with binary string of 64 bit integer on PHP?

This code is not working as expected

<?PHP
$t=11545152599186258990;
$byte_array_t = pack('P',$t);
echo base64_encode($byte_array_t); //not correct result - it should be: LrwswB6fOKA=
echo '
';
$t=11;
$byte_array_t = pack('P',$t);
echo base64_encode($byte_array_t); //correct

I am doing this because I am trying to implement the below code (golang) in PHP:

package main
import (
"fmt"
"encoding/base64"
"encoding/binary"
)



func main()  {

    dst := make([]byte, 8)
    binary.LittleEndian.PutUint64(dst, uint64(11545152599186258990))
    value :=base64.URLEncoding.EncodeToString(dst)
    fmt.Println(value)



}

Answer 1

Update

Try using gmp_export instead of pack. Make sure to pass the integer as a string to gmp_init since it will overflow otherwise:

$t = gmp_init("11545152599186258990");
$byte_array_t = gmp_export($t, 8);
echo base64_encode($byte_array_t); // LrwswB6fOKA=

Demo