PHPバイナリをテキストストリームに変換する方法

<?php
function bin2text($bin_str)
{
 $text_str = &#39;&#39;;
 $chars = explode("\n",chunk_split(str_replace("\n",&#39;&#39;,$bin_str),8));
 $_I = count($chars);
 for($i = 0; $i < $_I; $text_str .= chr(bindec($chars[$i])), $i );
 return $text_str;
}
function text2bin($txt_str)
{
 $len = strlen($txt_str);
 $bin = &#39;&#39;;
 for($i = 0; $i < $len; $i )
 {
  $bin .= strlen(decbin(ord($txt_str[$i])))<8?str_pad(decbin(ord($txt_str[$i])),8,0,STR_PAD_LEFT):decbin(ord($txt_str[$i]));
 }
 return $bin;
}
print text2bin(&#39;How are you gentlements?&#39;);
?>