Description:
------------
fputcsv() is behaving differently with different fields values. A string provided with a blank space gets enclosed by fputcsv but with other characters other than space are not enclosed. For details refer to the reproduce code and expected and actual output.

Reproduce code:
---------------
<?php
$fh = fopen("file.tmp","w");
$field_array = array('abc,def');
$field_array2 = array('abc def');
var_dump( fputcsv($fh, $field_array, '+', '$') );
fclose($fh);

var_dump( file_get_contents("file.tmp") );
unlink("file.tmp");
$fh = fopen("file2.tmp","w");
var_dump( fputcsv($fh, $field_array2, '+', '$') );
fclose($fh);

var_dump( file_get_contents("file2.tmp") );
?>

Expected result:
----------------
int(8)
string(8) "$abc,def$
"
int(10)
string(10) "$abc def$
"

Actual result:
--------------
int(8)
string(8) "abc,def
"
int(10)
string(10) "$abc def$
"