Invoke method of PHP reference Analysis _php Skill

This example describes the invocation method of a PHP reference. Share to everyone for your reference, specific as follows:

Example 1:

function test ($arr) {} 
echo Test (& $arr); 

Example 2:

Function test (& $arr) {} 
echo Test ($arr); 

Examples 1 and 2 are the same effect.

Example 3:

function &test ($arr) {return $result;} 
echo &test ($a);//valid 
echo Test ($a);//Returns a value, not a reference 

Summary: The reference is returned only when the method is defined by adding & and calling the method before the method name plus &.

Example 4:

$a = $b; 

When $a and $b are not assignable, that is, the same is the case with the $a=& $b, which is equivalent to an assignment reference.

A copy of the value is copied only when the $a or $b are changed $a

I hope this article will help you with the PHP program design.