How to parse from URL asynchronously for document parser API in PHP with PDF.co Web API

What is PDF.co Web API? It is the Rest API that provides set of data extraction functions, tools for documents manipulation, splitting and merging of pdf files. Includes built-in OCR, images recognition, can generate and read barcodes from images, scans and pdf.

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MultiPageTable-template1.yml

      
templateName: Multipage Table Test
templateVersion: 4
templatePriority: 0
detectionRules:
  keywords:
  - Sample document with multi-page table
objects:
- name: total
  objectType: field
  fieldProperties:
    fieldType: macros
    expression: TOTAL{{Spaces}}({{Number}})
    regex: true
    dataType: decimal
- name: table1
  objectType: table
  tableProperties:
    start:
      expression: Item{{Spaces}}Description{{Spaces}}Price
      regex: true
    end:
      expression: TOTAL{{Spaces}}{{Number}}
      regex: true
    row:
      expression: '{{LineStart}}{{Spaces}}(?<itemNo>{{Digits}}){{Spaces}}(?<description>{{SentenceWithSingleSpaces}}){{Spaces}}(?<price>{{Number}}){{Spaces}}(?<qty>{{Digits}}){{Spaces}}(?<extPrice>{{Number}})'
      regex: true
    columns:
    - name: itemNo
      dataType: integer
    - name: description
      dataType: string
    - name: price
      dataType: decimal
    - name: qty
      dataType: integer
    - name: extPrice
      dataType: decimal
    multipage: true

program.php

      
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document Parse Results</title>
</head>
<body>

<?php 

// Source PDF file
$uploadedFileUrl = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/document-parser/MultiPageTable.pdf";

// Get submitted form data
$apiKey = $_POST["apiKey"]; // The authentication key (API Key). Get your own by registering at https://app.pdf.co/documentation/api

// Read all template texts
$templateText = file_get_contents($_FILES["fileTemplate"]["tmp_name"]);

// PARSE UPLOADED PDF DOCUMENT
ParseDocument($apiKey, $uploadedFileUrl, $templateText);


function ParseDocument($apiKey, $uploadedFileUrl, $templateText) 
{
    // (!) Make asynchronous job
    $async = TRUE;

    // Prepare URL for Document parser API call.
    // See documentation: https://apidocs.pdf.co/?#1-pdfdocumentparser
    $url = "https://api.pdf.co/v1/pdf/documentparser";

    // Prepare requests params
    $parameters = array();
    $parameters["url"] = $uploadedFileUrl;
    $parameters["template"] = $templateText;
    $parameters["async"] = $async;

    // Create Json payload
    $data = json_encode($parameters);

    // Create request
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_HTTPHEADER, array("x-api-key: " . $apiKey, "Content-type: application/json"));
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);

    // Execute request
    $result = curl_exec($curl);
    echo $result . "<br/>";

    if (curl_errno($curl) == 0)
    {
        $status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
        
        if ($status_code == 200)
        {
            $json = json_decode($result, true);
        
            if ($json["error"] == false)
            {
                // URL of generated JSON file that will available after the job completion
                $resultFileUrl = $json["url"];
                // Asynchronous job ID
                $jobId = $json["jobId"];
                
                // Check the job status in a loop
                do
                {
                    $status = CheckJobStatus($jobId, $apiKey); // Possible statuses: "working", "failed", "aborted", "success".
                    
                    // Display timestamp and status (for demo purposes)
                    echo "<p>" . date(DATE_RFC2822) . ": " . $status . "</p>";
                    
                    if ($status == "success")
                    {
                        // Display link to JSON file with information about parsed fields
                        echo "<div><h2>Parsing Result:</h2><a href='" . $resultFileUrl . "' target='_blank'>" . $resultFileUrl . "</a></div>";
                        break;
                    }
                    else if ($status == "working")
                    {
                        // Pause for a few seconds
                        sleep(3);
                    }
                    else 
                    {
                        echo $status . "<br/>";
                        break;
                    }
                }
                while (true);
            }
            else
            {
                // Display service reported error
                echo "<p>Error: " . $json["message"] . "</p>"; 
            }
        }
        else
        {
            // Display request error
            echo "<p>Status code: " . $status_code . "</p>"; 
            echo "<p>" . $result . "</p>"; 
        }
    }
    else
    {
        // Display CURL error
        echo "Error: " . curl_error($curl);
    }
}

function CheckJobStatus($jobId, $apiKey)
{
    $status = null;
    
	// Create URL
    $url = "https://api.pdf.co/v1/job/check";
    
    // Prepare requests params
    $parameters = array();
    $parameters["jobid"] = $jobId;

    // Create Json payload
    $data = json_encode($parameters);

    // Create request
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_HTTPHEADER, array("x-api-key: " . $apiKey, "Content-type: application/json"));
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    
    // Execute request
    $result = curl_exec($curl);
    
    if (curl_errno($curl) == 0)
    {
        $status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
        
        if ($status_code == 200)
        {
            $json = json_decode($result, true);
        
            if ($json["error"] == false)
            {
                $status = $json["status"];
            }
            else
            {
                // Display service reported error
                echo "<p>Error: " . $json["message"] . "</p>"; 
            }
        }
        else
        {
            // Display request error
            echo "<p>Status code: " . $status_code . "</p>"; 
            echo "<p>" . $result . "</p>"; 
        }
    }
    else
    {
        // Display CURL error
        echo "Error: " . curl_error($curl);
    }
    
    // Cleanup
    curl_close($curl);
    
    return $status;
}

?>

</body>
</html>

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