PHP variable references a face question about PHP variable references

PHP face questions are as follows:

Copy the Code code as follows:

$a = 1;
$x =& $a;
$b = $a + +;
?>

Ask:
What are the values of $b and $x?
The answers to the PHP interview questions are as follows:
$b = 1;
$x = 2;
Do you understand? Don't understand, think again. When a variable equals a reference to another variable, either party changes its value, and the value seen by the other party changes. Before adding this time to show, and then add the next time will show.

The above describes a PHP variable reference to a PHP variable reference face question, including the PHP variable reference content, I hope the PHP tutorial interested in a friend helpful.

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