$out = "" and then $out. = with direct $out = What's the difference above there are examples

$out = "" and then $out. = with direct $out = What's the difference there are examples below

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);

Ask here.

PHP Code

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

to the

PHP Code

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

There's no difference.

------Solution--------------------
Initialization operation, if not initialized $out type is null, unlike the string you want, you can var_dump look at

If you use $out to make conditional judgments, you may get unpredictable results if you do not initialize them.
------Solution--------------------
$out = "";
while (!feof ($fp)) {$out. = fgets ($fp);}
Can fetch all the contents of the $fp file

$out = "";
while (!feof ($fp)) {$out = Fgets ($fp);}
The last line of the $fp file is taken

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