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Example code of phpfn/symbol

Informations about the package symbol

Symbol

Symbol is a special primitive data type, indicating an unique identifier. This symbol library implementation is similar to alternative types in:

1) Symbols in JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol 2) Symbols in Ruby: https://ruby-doc.org/core-2.5.0/Symbol.html 3) Symbols in TypeScript: https://www.typescriptlang.org/docs/handbook/symbols.html 4) Atoms in Erlang: http://erlang.org/doc/reference_manual/data_types.html#atom 5) ...e.g.

Installation

Library can be installed into any PHP application:

In order to access library make sure to include vendor/autoload.php in your file.

Usage

In order to create a new symbol data type, you should use the Symbol::create() method or call the global symbol() helper function.

Names

Each symbol can have a name (description), which is passed as the first parameter.

Uniqueness

Please note that the symbols are unique regardless of the names.

Usage In Constants

Symbols can be used as variable values and even constant!

Serialization

However cannot be serialized:

Type Comparison

Notice that the symbols are neither a string, nor a number, nor anything (almost :3) else.

Clone

Note that symbols are always passed by reference and cloning not allowed.

Naming

And in order to get the name of a symbol, just use the Symbol::key() method:

Reflection

And you can find out some details about this type:

Global Symbols

In addition to all this, you can use the Symbol::for method to create a global symbol. The Symbol::for($key) method searches for existing symbols in a runtime-wide symbol registry with the given key and returns it if found. Otherwise a new symbol gets created in the global symbol registry with this key.

And method Symbol::keyFor($symbol) returns a name for a global symbol.

All versions of symbol with dependencies

PHP Build Version
Package Version
Requires php Version >=7.4
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