What does PHP add before a variable?

Source: Internet
Author: User
What does it mean to add & amp; before the variables in php? This is the same as adding & amp; before the function. it also indicates reference.

Add & in front of the variables in php? This is the same as adding & before the function. it also indicates reference.

For example
[Php]
$ A = 'C ';
$ B = & $ a; // indicates that $ B and $ a reference the same variable.
$ A = 'abc'; // $ a is reset here.
Echo $ B; // returns abc
Unset ($ a); // cancel the reference
Echo $ B; // abc is still output here
$ A = 'abc ';
Echo $ B; // The abc is still output because the reference has been canceled.
?>
[/Php]

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