Oihana PHP System

ThingTrait uses \oihana\reflect\traits\JsonSchemaTrait

Provides common behavior for schema.org entities, including: - Object hydration from array or object - Automatic JSON-LD serialization - JSON Schema generation and validation - Integration with internal reflection tools

Used by all entities extending org\schema\Thing.

Tags
author

Marc Alcaraz (eKameleon)

since
1.0.2

Table of Contents

Constants

JSON_PRIORITY_KEYS  = [\org\schema\constants\Schema::AT_TYPE, \org\schema\constants\Schema::AT_CONTEXT, \org\schema\constants\Schema::_KEY, \org\schema\constants\Schema::_FROM, \org\schema\constants\Schema::_TO, \org\schema\constants\Schema::ID, \org\schema\constants\Schema::NAME, \org\schema\constants\Schema::URL, \org\schema\constants\Schema::CREATED, \org\schema\constants\Schema::MODIFIED]
Defines the priority order of keys when serializing the object to JSON-LD.

Properties

$atContext  : string|null
The JSON-LD `@context` value.
$atType  : string|null
The JSON-LD `@type` value.
$JSON_SERIALIZE_OPTIONS  : array<string|int, mixed>
The default jsonSerialize options (class-level configuration).
$schemaTypeCache  : array<string, string>
Internal cache for resolved schema types.

Methods

__construct()  : mixed
Constructor to hydrate public properties from an array or stdClass.
getJsonSerializeOptions()  : array<string|int, mixed>
Returns the default JSON serialization options.
getSchemaType()  : string
Returns the fully qualified URI of the schema type.
jsonSerialize()  : array<string|int, mixed>
Serializes the current object into a JSON-LD array.
withAtContext()  : $this
Sets the internal JSON-LD `@context` attribute.
withAtType()  : $this
Sets the internal JSON-LD `@type` attribute.
withJSONLDMeta()  : $this
Initializes both JSON-LD metadata: `@type` and `@context`.

Constants

JSON_PRIORITY_KEYS

Defines the priority order of keys when serializing the object to JSON-LD.

public array<string|int, string> JSON_PRIORITY_KEYS = [\org\schema\constants\Schema::AT_TYPE, \org\schema\constants\Schema::AT_CONTEXT, \org\schema\constants\Schema::_KEY, \org\schema\constants\Schema::_FROM, \org\schema\constants\Schema::_TO, \org\schema\constants\Schema::ID, \org\schema\constants\Schema::NAME, \org\schema\constants\Schema::URL, \org\schema\constants\Schema::CREATED, \org\schema\constants\Schema::MODIFIED]

Keys listed here will always appear first in the serialized array, in the order specified. All remaining public properties will be sorted alphabetically after these priority keys.

This ensures that important JSON-LD metadata and system fields (like @type, @context, _key, id, url, created, modified, etc.) appear at the top of the output for consistency and readability.

Usage:

$orderedKeys = self::JSON_PRIORITY_KEYS;

Notes:

  • Can be overridden in a subclass by redefining the constant.
  • Late static binding (static::JSON_PRIORITY_KEYS) allows child classes to modify the serialization order.

List of JSON-LD keys in priority order.

Properties

$atContext

The JSON-LD `@context` value.

protected string|null $atContext = null

Default is https://schema.org.

$atType

The JSON-LD `@type` value.

protected string|null $atType = null

This can be manually set or automatically inferred from the class name.

$JSON_SERIALIZE_OPTIONS

The default jsonSerialize options (class-level configuration).

protected static array<string|int, mixed> $JSON_SERIALIZE_OPTIONS = []

$schemaTypeCache

Internal cache for resolved schema types.

private static array<string, string> $schemaTypeCache = []

Methods

__construct()

Constructor to hydrate public properties from an array or stdClass.

public __construct([array<string|int, mixed>|object|null $init = null ]) : mixed

This allows objects to be quickly populated with associative data without manually setting each property.

Parameters
$init : array<string|int, mixed>|object|null = null

A data array or object used to initialize the instance. Keys must match public property names.

Tags
throws
ReflectionException
example 
use org\schema\Person;
use org\schema\constants\Prop;

$person = new Person
([
    Prop::NAME => 'Jane Doe',
    Prop::URL  => 'https://example.com/janedoe'
]);

echo $person->name; // Outputs: Jane Doe

getJsonSerializeOptions()

Returns the default JSON serialization options.

public getJsonSerializeOptions() : array<string|int, mixed>

This method determines how the jsonSerialize() output is reduced or compressed, etc. It can be overridden in child classes to customize serialization behavior.

Return values
array<string|int, mixed> —

Returns the reduction/compression options for JSON serialization.

getSchemaType()

Returns the fully qualified URI of the schema type.

public static getSchemaType() : string

This method combines the class's CONTEXT constant with its short name to produce a globally unique identifier for the entity type.

  • It uses Late Static Binding to ensure the correct context is retrieved even when called from an inherited class (e.g., Corporation vs. Affiliate).
  • Performance Optimization: Results are stored in a static cache ($schemaTypeCache) to avoid redundant Reflection calls during the same execution lifecycle.
Return values
string —

The absolute URI of the type (e.g., "https://schema.org/Thing"). ** @example

echo Thing::getSchemaType();      // https://schema.org/Thing
echo Affiliate::getSchemaType();  // https://schema.oihana.xyz/Pagination

jsonSerialize()

Serializes the current object into a JSON-LD array.

public jsonSerialize() : array<string|int, mixed>

Includes public properties, the JSON-LD @context and @type. Null values are automatically removed.

Tags
throws
ReflectionException

If reflection fails when accessing properties.

example 
use org\schema\Person;
use org\schema\constants\Prop;

$person = new Person
([
    Prop::NAME => 'John Smith',
    Prop::ID   => 'jsmith-001'
]);

echo json_encode($person, JSON_PRETTY_PRINT);

Output:

{
   "@type": "Person",
   "@context": "https://schema.org",
   "id": "jsmith-001",
   "name": "John Smith"
}
Return values
array<string|int, mixed> —

JSON-LD representation of the object.

withAtContext()

Sets the internal JSON-LD `@context` attribute.

public withAtContext(string $context) : $this

Useful if you need a custom JSON-LD context.

Parameters
$context : string

Optional JSON-LD context.

Return values
$this

withAtType()

Sets the internal JSON-LD `@type` attribute.

public withAtType(string $type) : $this

Allows overriding the default type inferred from the class.

Parameters
$type : string

Optional JSON-LD type

Return values
$this

withJSONLDMeta()

Initializes both JSON-LD metadata: `@type` and `@context`.

public withJSONLDMeta([string|null $atType = null ][, string|null $atContext = null ]) : $this

Can be called from constructor or later to override default values.

Parameters
$atType : string|null = null

Optional JSON-LD type

$atContext : string|null = null

Optional JSON-LD context

Return values
$this 

        

        
    




    

    

                                

                

                                
    

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