<?php
$triple = [
    'subject' =>   'http://example.org/cartoons#Tom',
    'predicate' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type',
    'object' =>    'http://example.org/cartoons#Cat',
    'graph' =>     'http://example.org/mycartoon', #optional
    ];

'"Tom"@en-gb' // lowercase language
'"1"^^http://www.w3.org/2001/XMLSchema#integer' // no angular brackets <>

use pietercolpaert\hardf\TriGWriter;

$writer = new TriGWriter([
    "prefixes" => [
        "schema" =>"http://schema.org/",
        "dct" =>"http://purl.org/dc/terms/",
        "geo" =>"http://www.w3.org/2003/01/geo/wgs84_pos#",
        "rdf" => "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
        "rdfs"=> "http://www.w3.org/2000/01/rdf-schema#"
        ],
    "format" => "n-quads" //Other possible values: n-quads, trig or turtle
]);

$writer->addPrefix("ex","http://example.org/");
$writer->addTriple("schema:Person","dct:title","\"Person\"@en","http://example.org/#test");
$writer->addTriple("schema:Person","schema:label","\"Person\"@en","http://example.org/#test");
$writer->addTriple("ex:1","dct:title","\"Person1\"@en","http://example.org/#test");
$writer->addTriple("ex:1","http://www.w3.org/1999/02/22-rdf-syntax-ns#type","schema:Person","http://example.org/#test");
$writer->addTriple("ex:2","dct:title","\"Person2\"@en","http://example.org/#test");
$writer->addTriple("schema:Person","dct:title","\"Person\"@en","http://example.org/#test2");
echo $writer->end();

//The method names should speak for themselves:
$writer = new TriGWriter(["prefixes": [ /* ... */]]);
$writer->addTriple($subject, $predicate, $object, $graphl);
$writer->addTriples($triples);
$writer->addPrefix($prefix, $iri);
$writer->addPrefixes($prefixes);
//Creates blank node($predicate and/or $object are optional)
$writer->blank($predicate, $object);
//Creates rdf:list with $elements
$list = $writer->addList($elements);

//Returns the current output it is already able to create and clear the internal memory use (useful for streaming)
$out .= $writer->read();
//Alternatively, you can listen for new chunks through a callback:
$writer->setReadCallback(function ($output) { echo $output });

//Call this at the end. The return value will be the full triple output, or the rest of the output such as closing dots and brackets, unless a callback was set.
$out .= $writer->end();
//OR
$writer->end();

$parser = new TriGParser($options, $tripleCallback, $prefixCallback);
$parser->setTripleCallback($function);
$parser->setPrefixCallback($function);
$parser->parse($input, $tripleCallback, $prefixCallback);
$parser->parseChunk($input);
$parser->end();

use pietercolpaert\hardf\TriGParser;
use pietercolpaert\hardf\TriGWriter;
$parser = new TriGParser(["format" => "n-quads"]); //also parser n-triples, n3, turtle and trig. Format is optional
$writer = new TriGWriter();
$triples = $parser->parse("<A> <B> <C> <G> .");
$writer->addTriples($triples);
echo $writer->end();

$parser = new TriGParser();
$writer = new TriGWriter(["format"=>"trig"]);
$parser->parse("<http://A> <https://B> <http://C> <http://G> . <A2> <https://B2> <http://C2> <http://G3> .", function ($e, $triple) use ($writer) {
    if (!isset($e) && isset($triple)) {
        $writer->addTriple($triple);
        echo $writer->read(); //write out what we have so far
    } else if (!isset($triple))      // flags the end of the file
        echo $writer->end();  //write the end
    else
        echo "Error occured: " . $e;
});

$writer = new TriGWriter(["format"=>"n-quads"]);
$tripleCallback = function ($error, $triple) use ($writer) {
    if (isset($error))
        throw $error;
    else if (isset($triple)) {
        $writer->write();
        echo $writer->read();
    else if (isset($error)) {
        throw $error;
    } else {
        echo $writer->end();
    }
};
$prefixCallback = function ($prefix, $iri) use (&$writer) {
    $writer->addPrefix($prefix, $iri);
};
$parser = new TriGParser(["format" => "trig"], $tripleCallback, $prefixCallback);
$parser->parseChunk($chunk);
$parser->parseChunk($chunk);
$parser->parseChunk($chunk);
$parser->end(); //Needs to be called

use pietercolpaert\hardf\Util;

$bool = isIRI($term);
$bool = isLiteral($term);
$bool = isBlank($term);
$bool = isDefaultGraph($term);
$bool = inDefaultGraph($triple);
$value = getLiteralValue($literal);
$literalType = getLiteralType($literal);
$lang = getLiteralLanguage($literal);
$bool = isPrefixedName($term);
$expanded = expandPrefixedName($prefixedName, $prefixes);
$iri = createIRI($iri);
$literalObject = createLiteral($value, $modifier = null);