Graphics cannot be displayed on PHPLOT

Question

I would like to seek help on PHPLOT if possible. The chart displays fine when using dummy data, but when I call the $words array, the chart does not display.

Chart code:

<?php
include_once ("class/ProcessaPdf.class.php");
require_once 'lib/phplot-5.5.0/phplot.php';

//$words = ProcessaPdf::geraArrayPalavrasChave();

$plot = new PHPlot(640, 480);

$data = array(
    array('1940', 6.2),
    array('1950', 6.2),
    array('1960', 6.3),
    array('1970', 5.8),
    );

$plot->SetTitle('Grafico da analise de palavras-chave encontradas');
$plot->SetPlotType("bars");

$plot->SetXLabel("Palavras");
$plot->SetYLabel("Frequencia");

$plot->SetXLabelFontSize(2);
$plot->SetAxisFontSize(2);

$plot->SetDataValues($data);
$plot->SetYDataLabelPos('plotin');

$plot->DrawGraph();

?>

If I uncomment the line //$words = ProcessaPdf::geraArrayPalavrasChave(); the chart fails

So I can’t replace $data with $word

Function that returns $words:

static function geraArrayPalavrasChave(){
    $p_chaves = file("./lib/palavras_chave.txt", FILE_TEXT | FILE_IGNORE_NEW_LINES);

    // Initialize and load PDF Parser library
    $parser = new SmalotPdfParserParser();
    
    // Source PDF file to extract text
    $file = 'lib/projeto.pdf';
    
    // Parse pdf file using Parser library
    $pdf = $parser->parseFile($file);
    
    // Extract text from PDF
    $text = $pdf->getText();

    for($i=0; $i<count($p_chaves); $i ){
        if(substr_count(' '.$text.' ', ' '.$p_chaves[$i].' ') != ''){
            $dados[$i][] = $p_chaves[$i];
            $dados[$i][] = substr_count(mb_strtoupper(' '.$text.' '), mb_strtoupper(' '.$p_chaves[$i].' '));
        }
    }

   for($i=0; $i<count($dados); $i ){
        $key[] = $i;
    }

    $arrayPalavras = array_combine($key, $dados);

    return $arrayPalavras;

}

I tried to generate a chart from the $words array

Update

$words = ProcessaPdf::geraArrayPalavrasChave();

Return array:

Array (
    [0] => Array (
        [0] => inovações
        [1] => 3
    )
    [1] => Array (
        [0] => tecnologia da informação
        [1] => 2
    )
    [2] => Array (
        [0] => intelectuais
        [1] => 4
    )
    [3] => Array (
        [0] => patente
        [1] => 5
    )
)

Answer 1

I solved this problem. I updated the pdfparser library in composer and then updated autoload. The problem is not in phplot, but in pdfparser.