(PHP 5 >= 5.6.1, PHP 7)
gmp_export — Export to a binary string
$gmpnumber
   [, int $word_size = 1
   [, int $options = GMP_MSW_FIRST | GMP_NATIVE_ENDIAN
  ]] ) : stringExport a GMP number to a binary string
gmpnumberThe GMP number being exported
word_sizeDefault value is 1. The number of bytes in each chunk of binary data. This is mainly used in conjunction with the options parameter.
optionsDefault value is GMP_MSW_FIRST | GMP_NATIVE_ENDIAN.
   Returns a string 或者在失败时返回 FALSE.
  
Example #1 gmp_export() example
<?php
$number = gmp_init(16705);
echo gmp_export($number) . "\n";
?>
以上例程会输出:
AA