How to read barcode from URL asynchronously for barcode reader API in PHP and PDF.co Web API

How to read barcode from URL asynchronously for barcode reader API in PHP: Step By Step Tutorial

Here you may find thousands pre-made source code pieces for easy implementation in your own programming projects. Barcode reader API in PHP can be implemented with PDF.co Web API. PDF.co Web API is the flexible Web API that includes full set of functions from e-signature requests to data extraction, OCR, images recognition, pdf splitting and pdf splitting. Can also generate barcodes and read barcodes from images, scans and pdf.

This rich sample source code in PHP for PDF.co Web API includes the number of functions and options you should do calling the API to implement barcode reader API. Follow the instruction and copy – paste code for PHP into your project’s code editor. Writing PHP application typically includes multiple stages of the software development so even if the functionality works please test it with your data and the production environment.

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read-barcode-async.php
      
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Cloud API asynchronous "Barcode Reader" job example (allows to avoid timeout errors).</title> </head> <body> <?php // Cloud API asynchronous "Barcode Reader" job example. // Allows to avoid timeout errors when processing huge or scanned PDF documents. // The authentication key (API Key). // Get your own by registering at https://app.pdf.co/documentation/api $apiKey = "***********************************"; // Direct URL of source file (image or PDF) to search barcodes in. Check another example if you need to upload a local file to the cloud. $sourceFileUrl = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/barcode-reader/sample.pdf"; // Comma-separated list of barcode types to search. // See valid barcode types in the documentation https://app.pdf.co/documentation/api/1.0/barcode/read_from_url.html $barcodeTypes = "Code128,Code39,Interleaved2of5,EAN13"; // Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'. $pages = ""; // Prepare URL for `Barcode Reader` API call $url = "https://api.pdf.co/v1/barcode/read/from/url" . "?types=" . $barcodeTypes . "&pages=" . $pages . "&url=" . $sourceFileUrl . "&async=true"; // (!) Make asynchronous job // Create request $curl = curl_init(); curl_setopt($curl, CURLOPT_HTTPHEADER, array("x-api-key: " . $apiKey)); curl_setopt($curl, CURLOPT_URL, $url); curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 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); // 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 decoded barcodes echo "<div><h2>Conversion 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); } // Cleanup curl_close($curl); function CheckJobStatus($jobId) { $status = null; // Create URL $url = "https://api.pdf.co/v1/job/check?jobid=" . $jobId; // Create request $curl = curl_init(); curl_setopt($curl, CURLOPT_HTTPHEADER, array("x-api-key: " . $apiKey)); curl_setopt($curl, CURLOPT_URL, $url); curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 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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