<?php
include 'MajorTriad.php'
$triad = new MajorTriad('C');
echo $triad->getRoot();
?>
<?php
class MajorTriad {
private $root;
private $rootNumber;
private $third;
private $thirdNumber;
private $fifth;
private $fifthNumber;
function __construct($root)
{
$this->root = $root;
}
protected function getChord()
{
$this->rootNumber = $this->getCorrespondingRootNumber($this->root);
$this->thirdNumber = $this->getThirdNumber($this->rootNumber);
$this->fifthNumber = $this->getFifthNumber($this->rootNumber);
$this->third = $this->getChordNote($this->root, $this->thirdNumber);
$this->fifth = $this->getChordNote($this->third, $this->fifthNumber);
$chord = $this->root . $this->third . $this->fifth;
return $chord;
}
protected function getRoot()
{
return $this->root;
}
protected function getThird()
{
return $this->third;
}
protected function getFifth()
{
return $this->fifth;
}
protected function getThirdNumber($rootNumber)
{
$this->thirdNumber = $rootNumber + 4;
}
protected function getFifthNumber($rootNumber)
{
$this->fifthNumber = $rootNumber + 7;
}
protected function getCorrespondingRootNumber($rootNote)
{
switch ($rootNote) {
case 'G♯':
$this->rootNumber = 1;
break;
case 'A♭':
$this->rootNumber = 1;
break;
case 'A':
$this->rootNumber = 2;
break;
case 'A♯':
$this->rootNumber = 3;
break;
case 'B♭':
$this->rootNumber = 3;
break;
case 'B':
$this->rootNumber = 4;
break;
case 'C':
$this->rootNumber = 5;
break;
case 'C♯':
$this->rootNumber = 6;
break;
case 'D♭':
$this->rootNumber = 6;
break;
case 'D':
$this->rootNumber = 7;
break;
case 'D♯':
$this->rootNumber = 8;
break;
case 'E♭':
$this->rootNumber = 8;
break;
case 'E':
$this->rootNumber = 9;
break;
case 'F':
$this->rootNumber = 10;
break;
case 'F♯':
$this->rootNumber = 11;
break;
case 'G♭':
$this->rootNumber = 11;
break;
case 'G':
$this->rootNumber = 12;
break;
default:
die('Error assigning root number');
}
}
protected function getChordNote($thirdBelow, $number)
{
$letterNote = $this->getLetter($thirdBelow);
$currentLetter = $this->thirdUp($letterNote);
switch ($number) {
case 1:
if (strpos('G♯', $currentLetter)) $chordTone = 'G♯';
elseif (strpos('A♭', $currentLetter)) $chordTone = 'A♭';
break;
case 2:
if (strpos( 'G𝄪', $currentLetter)) $chordTone = 'G𝄪';
elseif (strpos('A', $currentLetter)) $chordTone = 'A';
elseif (strpos('B𝄫', $currentLetter)) $chordTone = 'B𝄫';
break;
case 3:
if (strpos('A♯', $currentLetter)) $chordTone = 'A♯';
elseif (strpos('C𝄫', $currentLetter)) $chordTone = 'C𝄫';
elseif (strpos('B♭', $currentLetter)) $chordTone = 'B♭';
break;
case 4:
if (strpos('A𝄪', $currentLetter)) $chordTone = 'A𝄪';
elseif (strpos('B', $currentLetter)) $chordTone = 'B';
elseif (strpos('C♭', $currentLetter)) $chordTone = 'C♭';
break;
case 5:
if (strpos('B♯', $currentLetter)) $chordTone = 'B♯';
elseif (strpos('C', $currentLetter)) $chordTone = 'C';
elseif (strpos('D𝄫', $currentLetter)) $chordTone = 'D𝄫';
break;
case 6:
if (strpos('B𝄪', $currentLetter)) $chordTone = 'B𝄪';
elseif (strpos('C♯', $currentLetter)) $chordTone = 'C♯';
elseif (strpos('D♭', $currentLetter)) $chordTone = 'D♭';
break;
case 7:
if (strpos('C𝄪', $currentLetter)) $chordTone = 'C𝄪';
elseif (strpos('D', $currentLetter)) $chordTone 'D';
elseif (strpos('E𝄫', $currentLetter)) $chordTone = 'E𝄫';
break;
case 8:
if (strpos('D♯', $currentLetter)) $chordTone = 'D♯';
elseif (strpos('E♭', $currentLetter)) $chordTone = 'E♭';
elseif (strpos('F𝄫', $currentLetter)) $chordTone = 'F𝄫';
break;
case 9:
if (strpos('D𝄪', $currentLetter)) $chordTone = 'D𝄪';
elseif (strpos('E', $currentLetter)) $chordTone = 'E';
elseif (strpos ('F♭', $currentLetter)) $chordTone = 'F♭';
break;
case 10:
if (strpos('E𝄪', $currentLetter)) $chordTone = 'E♯';
elseif (strpos('F', $currentLetter)) $chordTone = 'F';
elseif (strpos('G𝄫', $currentLetter)) $chordTone = 'G𝄫';
break;
case 11:
if (strpos('E𝄪', $currentLetter)) $chordTone = 'E𝄪';
elseif (strpos('F♯', $currentLetter)) $chordTone = 'F♯';
elseif (strpos('G♭', $currentLetter)) $chordTone = 'G♭';
break;
case 12:
if (strpos('F𝄪', $currentLetter)) $chordTone = 'F𝄪';
elseif (strpos('G', $currentLetter)) $chordTone = 'G';
elseif (strpos('A𝄫', $currentLetter)) $chordTone = 'A𝄫';
break;
default:
die('Error in getChordNote method');
}
}
protected function getLetter($note)
{
if (strpos($note, 'A')) $letterNote = 'A';
elseif (strpos($note, 'B')) $letterNote = 'B';
elseif (strpos($note, 'C')) $letterNote = 'C';
elseif (strpos($note, 'D')) $letterNote = 'D';
elseif (strpos($note, 'E')) $letterNote = 'E';
elseif (strpos($note, 'F')) $letterNote = 'F';
elseif (strpos($note, 'G')) $letterNote = 'G';
else
{
$letterNote = null;
die('error in getLetter method');
}
return $letterNote;
}
protected function thirdUp($letterNote)
{
switch ($letterNote) {
case 'A':
$nextNote = 'C';
break;
case 'B':
$nextNote = 'D';
break;
case 'C':
$nextNote = 'E';
break;
case 'D':
$nextNote = 'F';
break;
case 'E':
$nextNote = 'G';
break;
case 'F':
$nextNote = 'A';
break;
case 'G':
$nextNote = 'B';
break;
default:
die('Error in method thirdUp()');
}
return $nextNote;
}
}
?>
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