如果可能的话，我想在PHPLOT上寻求帮助。图表在使用虚拟数据时正常显示，但是当我调用$words数组时，图表不显示。

图表代码：

<?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();

?>

如果我取消注释//$words = ProcessaPdf::geraArrayPalavrasChave();这一行，图表就会失败

所以我不能用$word替换$data

返回$words的函数：

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;

}

我尝试从$words数组生成图表

更新

$words = ProcessaPdf::geraArrayPalavrasChave();

返回数组：

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         
    )  
)