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Example code of eloquent/pops

Informations about the package pops

No longer maintained

This package is no longer maintained. See this statement for more info.

Pops

PHP Object Proxy System.

Installation and documentation

What is Pops?

Pops is a system for wrapping PHP objects in other objects to modify their behaviour. A Pops proxy will, as much as possible, imitate the object it wraps. It passes along method calls and returns the underlying result, and allows transparent access to properties (for both setting and getting).

Pops is the underlying system behind Liberator.

Creating proxies

Let's write a simple proxy that converts everything to uppercase. Here we have a class:

And here is our proxy:

We use popsCall() here rather than __call() to get around PHP limitations to do with passing arguments by reference. See [calling methods with by-reference parameters] for a deeper explanation.

Now when we access wat() and $derp both normally, and through our proxy, we can see the effect:

Recursive proxies

Pops proxies can be applied to any value recursively. This comes in handy when designing, for example, an output escaper (similar to Symfony). Here's an example of how such a system could be created for escaping HTML output:

The output escaper can now be used like so:

Which would output:

Note that the above example should NOT be used in production. Output escaping is a complex issue that should not be taken lightly.

Excluding values from recursion

Note that in the above example, the last list item was wrapped in a Safe proxy. When Pops applies its proxies, it will skip anything marked as safe in this manner.

Calling methods with by-reference parameters

Because of PHP limitations, methods with arguments that are passed by reference must be called in a special way.

To explain futher, let's assume our class from before also has a method which accepts a reference:

This method cannot be proxied normally because the $wasPhone argument is passed by reference. The correct way to call the above butWho() method through a Pops proxy looks like this:

Note that there must be a variable for the $wasPhone argument, and there must be a variable for the arguments themselves. Neither can be passed directly as a value. The arguments must also contain a reference to $wasPhone argument.

All versions of pops with dependencies

PHP Build Version
Package Version
Requires php Version ^7.4 || ^8
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