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I've seen these characters used together in Wordpress PHP, but I'm not sure what they do. An example:

$content .= '' . $title . '';

Pilgrimish
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    In the future, this is a great resource, especially because you can't search for symbols in google: [Symbol Reference](http://stackoverflow.com/questions/3737139/reference-what-does-this-symbol-mean-in-php) – James G. Sep 16 '13 at 04:21

5 Answers5

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That is the short hand version of a concatenation where you say append something to the end of this string itself. It means

$content = $content. $title;
Hanky Panky
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Thats a php string concatenation operation. For example

$str1 = "Hello";
$str2 = "World";
$str1 .= " " . $str2; // is equal to writing $str1 = $str1 . " " . $str2;
echo $str1 // will print Hello World
Josnidhin
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Same as this :

$content = $content . '' . $title . '';
Fouad Fodail
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It is a concatenation assignment operator

$x="Hello";
$x .= " world!";
echo $x; // outputs Hello world!
Lazik
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$a .= $b means $a = $a . $b

This also apply to some other operations such as +, -, *, /, ... For example:

$a += $b    => $a = $a + $b
$a -= $b    => $a = $a - $b
$a *= $b    => $a = $a * $b
$a /= $b    => $a = $a / $b
invisal
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