I have a question regarding the different usage of & in the following two examples:
$x = &$b; // which I know what it does
But what about this one:
$x &= get_instance();
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possible duplicate of [Reference - What does this symbol mean in PHP?](http://stackoverflow.com/questions/3737139/reference-what-does-this-symbol-mean-in-php) – John Conde Mar 14 '14 at 21:59
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http://stackoverflow.com/questions/1367454/what-do-operators-in-php-mean – John Conde Mar 14 '14 at 22:00
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thanks. Read those questions. – Mostafa Talebi Mar 14 '14 at 22:07
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&= is the "bitwise and"-assignment operator. In PHP
$a &= $b;
is the same as
$a = $a & $b;
"bitwise and" means that two corresponding bits of two arguments are evaluated using the and-operator. If the arguments are not integers, they are converted to integer values first. For details you can refer to the php manual.
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