chordpro-php

A simple tool to parse, transpose & format ChordPro songs with lyrics & chords.

It currently supports the following output formats :

• HTML (verses contain blocks with embricated span for alignement of chords with lyrics)
• JSON (verses are array of arrays of chords and lyrics for alignement purpose)
• Plain text (chords are aligned with monospace text thanks to whitespaces)

And provides some extra functionnalities :

• Tranpose chords (can be very clever if original key is known)
• Display french chords
• Guess tonality key of a song

I'm french, so there's probably a lot of mistakes, my english is not always accurate — je fais ce que je peux hein :P

Install

Via composer :

$ composer require nicolaswurtz/chordpro-php

Usage

See web/example.php for demo with CSS styling.

<?php

require __DIR__ . '/vendor/autoload.php';

$txt = "{t:ChordpropPHP Song}
{st:Nicolas Wurtz}
{c:GPL3 2019 Nicolas Wurtz}
{key:C}
[C]This is the [Dm]beautiful [Em]song
I [Dm]wroted in [F/G]Chordpro for[C]mat [Dm/F]
Let's singing a[C/E]long
[Bb] It's ea[Dm]sy to do [F]that [C]

{soc}
[F] [G] [C]This is the refrain
[F] [G] [C]We could sing it twice
{eoc}

{c:Final}
[Em/D]This is the [Bb]end.";

$parser = new ChordPro\Parser();

// Choose one (or all !) of those formatters following your needs
$html_formatter = new ChordPro\HtmlFormatter();
$monospace_formatter = new ChordPro\MonospaceFormatter();
$json_formatter = new ChordPro\JSONFormatter();

// Create song object after parsing txt
$song = $parser->parse($txt);

// You can tranpose your song, put how many semitones you want to transpose in second argument OR desired key (only if metadata "key" is defined)
$transposer = new ChordPro\Transposer();
$transposer->transpose($song,-5); // Simple transpose, but could produce some musical errors (sharp instead of flat)
//$transposer->transpose($song,'Abm');

// Some options are mandatory, you could use en empty array if none
$options = array(
    'french' => true,
    'no_chords' => true
);

// Render !
$html = $html_formatter->format($song,$options);
$plaintext = $monospace_formatter->format($song,$options);
$json = $json_formatter->format($song,$options);

Formatting options

Simply give an array with values at true or false for each key/option.

array(
    'french' => true, // to display french chords (Do, Ré, Mi, Fa, Sol, La, Si, Do), including Song Key.
    'no_chords' => true // to only get text (it removes "block" system for chords alignements)
);

Specific methods

Song

• $song->getKey([]) to obtain key of song, with transposition, you can alter langage english by default, or French $song->getKey(['french' => true]);, options array is mandatory, you could use en empty array if none
• $song->getOriginalKey() to obtain key of song, as defined in metadata's field "key"

Guess key of a song

This fonctionnality is experimental and not reliable (20% of mistakes, tested with ~1000 songs), but can be very useful. Usage is very simple (you have to parse a song before as described before):

$guess = new ChordPro\GuessKey();
$key = $guess->guessKey($song);

CSS Classes you can use with HTML Formatter

Verses

Verses are one line composed by blocks of text + chords, chord with class chordpro-chord and text with class chordpro-text.

A typical div will be like this :

<div class="chordpro-verse">
    <span class="chordpro-elem">
        <span class="chordpro-chord">C</span>
        <span class="chordpro-text">This is the </span>
    </span>
    <span class="chordpro-elem">
        <span class="chordpro-chord">Dm</span>
        <span class="chordpro-text">beautiful song</span>
    </span>
</div>

Chorus

The chorus (soc/start_of_chorus) will be contained inside <div class="chordpro-chorus"></div>.

Metadata

By default, all metadatas are placed inside <div class="chordpro-metadataname"></div>. For example, the title will be

<div class="chordpro-title">It's a great title !</div>

ChordproPHP doesn't care about the metadata names, it just puts it after chordpro- :)

Metatada's names are always converted to their long form (c will be recorded as comment) when using short names from official directives