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Informations about the package equality

Equality

A better strict comparison for PHP.

The most recent stable version is 2.1.2 Current build status image Current coverage status image

Deprecated

Equality is deprecated. Please use Parity instead.

Installation and documentation

The problem

Sometimes it is necessary to compare two objects to determine whether they are considered equal.

If the == operator is used, there is no strictness about the equality. For instance, this snippet outputs 'equal':

Conversely, if the === operator is used, objects are not equal unless they are the same instance. The following snippet outputs 'not equal':

Unfortunately PHP does not have an inbuilt method to compare objects strictly without requiring that they be the same instance. This is where Equality comes in. This snippet correctly outputs 'equal':

Usage

Equality is very simple to use. Simply instantiate a Comparator and use its equals() method:

Equality can work with any PHP data type, not just objects.

Custom equality logic

In some cases it may be desirable to customize how equality is determined. The interface EqualityComparable can be used to provide a custom equality implementation for any class:

When Equality encounters an object that implements EqualityComparable, it will return the result of the isEqualTo() method instead of using the default equality logic. The comparator itself will be passed as the second parameter.

How does Equality work?

Equality uses reflection to recurse over the values it is passed and ensure that they are deeply, and strictly, equal.

In addition, it implements special protections to avoid infinite recursion issues, such as objects that contain themselves, or objects that contain the object that they are being compared to.

All versions of equality with dependencies

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Package Version
Requires php Version >=5.3
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