.=

[hgmme@wa]

I've come upon some code that uses .= for a comparison and I've got no clue what it does. So if someone could explain what does that'd be awesome.

[boen_robot]

That's no comparrison. That's concatenation assignment. That is, assign the value of a variable to be that variable, concatenated with the variable on the right.In other words,

$var1 .= $var2;

is the same as

$va1 = $var1 . $var2;

If used in a comparrison, like:

if ($var1 .= $var2)

then it would always evaluate to "true" unless $var2 in being concatenated with $var1 somehow resulted to a boolean false, and I'm not aware of any scenario where that would be possible.

[hgmme@wa]

Ok that makes sense. Thanks.

[coolgamer48]

For any operator (e.g., +, -, *, /, .)$x operator= $ymeans:$x = $x operator &y.So, $x += $y is the same as $x = $x + $y, et cetera.