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Example code of reedware/is-attribute

Informations about the package is-attribute

Is Attribute

Automated Tests Coding Standards Code Coverage Static Analysis Latest Stable Version

This package adds a truth test helper for checking if class is an attribute.

Introduction

PHP Attributes were introduced in PHP 8.0. From the documentation, you can see that Attributes are defined similar to classes:

However, if you're handed the name of a class, there's no good way to know if that class is a PHP Attribute or not. This is where the is_attribute() method, as defined by this package, comes in.

Installation

Install this package using Composer:

Usage

Class Argument

Let's start with the basics. For more use-cases, you'll only need to pass one parameter to is_attribute(), being the class itself.

Here's an example of that:

Target Argument

If you care what targets the attributes support, this is where an optional second parameter comes in.

For example, you can define an attribute like so:

This defines a Serialize attribute that can applied to a class or property.

To check if an attribute can be applied to a class or property, you can pass in targets as the second parameter to is_attribute:

Note that checking one or the other will return false:

When the second argument is not specified (e.g. null), the specified class must simply be an Attribute, regardless of target. This is different from passing in Attribute::TARGET_ALL as the second argument, which will require the attribute to specify all targets (which is the default).

This is because the second parameter must be an exact match to the attribute.

Match Argument

If you don't want to do an exact match, you can use the optional third parameter.

TARGET_MATCH_EQUALS

This is the default value of the third argument, and exhibits the behavior already described above.

TARGET_MATCH_INCLUDES

This match setting requires ALL of the provided targets to be included (e.g. and/conjunction).

TARGET_MATCH_ANY

This match setting requires ANY of the provided targets to be included (e.g. or/disjunction).

All versions of is-attribute with dependencies

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Requires php Version >=8.0
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