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

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.

