PHP Reference Call method analysis PHP Data analysis system PHP slow log Analysis PHP project case analysis PD

Source: Internet
Author: User
Tags php programming
This example describes the invocation method for PHP references. Share to everyone for your reference, as follows:

Example 1:


Example 2:


Examples 1 and 2 are the same effect.

Example 3:


Summary: The reference is returned only when the method is defined with the & and the method in front of the method name plus & when it is called.

Example 4:


When $ A and $b are not re-assigned, that is, when a write operation occurs, the same as the $a=& $b, which is equivalent to an assignment reference.

Copies a copy of a value of $ A only when a $ A or $b change occurs

I hope this article is helpful to you in PHP programming.

The above describes the PHP reference invocation method analysis, including PHP, analysis of the content, I hope that the PHP tutorial interested in a friend helpful.

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