I ,beginner of PHP, would like to ask what _\\_ means?

Here's the code:
$fp = @fopen ("a.txt")
while ($buf = @fgets($fp,1024) {
trim($buf)
if (substr($buf,-1 == _\\_) {
.
..

with the above code Two or more lines ended with \ will be joined,
for example,
aaaaaa\
aaaaa

become ,
aaaaaaaaaaa



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