$ Out = "" and then $ out. = What is the difference with direct $ out =? the above example is provided.

$ Out & quot; and then $ out. what is the difference between it and $ out? the following example shows PHPcode $ fp @ fsockopen ($ whoisserver, $ port, $ errno, $ errstr, $ timeout) ordie (& quot; socketError & quot ;. $ errno. & quot; $ out = "" and then $ out. = What is the difference from direct $ out =? The following is an example.

PHP code

  $fp = @fsockopen($whoisserver, $port, $errno, $errstr, $timeout) or die("Socket Error " . $errno . " - " . $errstr);    fputs($fp, $domain . "\r\n");    $out = "";    while (!feof($fp)){$out .= fgets($fp);}    fclose($fp);

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PHP code

  $out = "";    while (!feof($fp)){$out .= fgets($fp);}

Yu and

PHP code

      while (!feof($fp)){$out= fgets($fp);}

What is the difference?

------ Solution --------------------
The initialization operation. if the $ out type is not initialized, it is null. it is different from the string type you want. you can check it with var_dump.

If $ out is used for condition determination, unexpected results may be obtained without initialization.
------ Solution --------------------
$ Out = "";
While (! Feof ($ fp) {$ out. = fgets ($ fp );}
All content in the $ fp file can be obtained.

$ Out = "";
While (! Feof ($ fp) {$ out = fgets ($ fp );}
The last line of the $ fp file is obtained.