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app/Analyzers/PdfAnalyzer.php

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+<?php
+
+namespace App\Analyzers;
+
+use Smalot\PdfParser\Parser;
+
+/**
+ * Extract information from a PDF file.
+ */
+class PdfAnalyzer extends Analyzer
+{
+    /**
+     * PDF parser.
+     *
+     * @var \Smalot\PdfParser\Parser
+     */
+    protected $parser;
+
+    /**
+     * Analyzes document.
+     */
+    public function analyze()
+    {
+        if (empty($this->body)) {
+            return;
+        }
+
+        $this->extractDetails();
+        $this->storeDetailsOnDisk();
+        $this->applyDetailsToDocument();
+
+        $this->document->description = (string) view('partials.details.pdf')->with([
+            'details' => $this->details,
+            'url'     => asset(str_replace('public', 'storage', $this->document->getStoragePath()).'/body'),
+        ]);
+    }
+
+    /**
+     * Store some details in database. This method uses an array to map document
+     * properties to metadata properties.
+     *
+     * @param mixed $mappings
+     */
+    protected function applyDetailsToDocument($mappings = [])
+    {
+        $mappings = [
+            'title' => 'Title',
+        ];
+
+        parent::applyDetailsToDocument($mappings);
+    }
+
+    /**
+     * Return an instance of PDF parser.
+     *
+     * @return \Smalot\PdfParser\Parser
+     */
+    private function getParser()
+    {
+        if (!$this->parser) {
+            $this->parser = new Parser();
+        }
+
+        return $this->parser;
+    }
+
+    /**
+     * Parse PDF content.
+     *
+     * @param mixed $content
+     */
+    private function parseContent($content)
+    {
+        $parser = $this->getParser();
+
+        return $parser->parseContent($content);
+    }
+
+    /**
+     * Return an array of meta data included in PDF.
+     */
+    private function extractDetails()
+    {
+        $data          = $this->parseContent($this->body);
+        $this->details = $data->getDetails();
+
+        return $this->details;
+    }
+}