$bin= bstr2bin($json);
file_put_contents('../somefold/',$bin);
function bstr2bin($input){
// Binary representation of a binary-string
if (!is_string($input)) return null; // Sanity check
// Unpack as a hexadecimal string
$value = unpack('H*', $input);
// Output binary representation
$value = str_split($value[1], 1);
$bin = '';
foreach ($value as $v){
$b = str_pad(base_convert($v, 16, 2), 4, '0', STR_PAD_LEFT);
$bin .= $b;
}
return $bin;
file_put_contents此函数可以安全用于二进制对象
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