Php write some variables in the same line

Question

I would like to ask a simple question. I have different variables $a='a', $b='b', $c='c' in PHP. I would like to save the target txt file with the format like

"a b c". 

But if I use fwrite, I could only write the variables in a column.

"a
 b
 c"

Anyone could help me? Thanks in advance.

PS

I found problem may be here. Each variable I used is from the lines of a existed file.

 $lines= files('abc.txt'); 
 $a = $lines[0]; //like this

In this circumstance, the variables contains also a line feed ? Am I write ?

Answer 1

Use a single fwrite statement to write them all at once:

fwrite( $fp, "$a $b $c" );

Answer 2

Join them as a single string:

$str = $a.' '.$b.' '.$c;

Then write them to the file.

Answer 3

I am a little confused about your query but as per what I have understood is that you want something like this:

$a='a';
$b='b';
$c='c';
$fp = fopen('data.txt', 'w');
fwrite($fp,$a." ");
fwrite($fp,$b." ");
fwrite($fp,$c);
fclose($fp);