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Read Barcode From Uploaded File - PHP

Barcode Reader sample in PHP demonstrating ‘Read Barcode From Uploaded File’

read-barcode.php
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Barcode Reader Results</title>
</head>
<body>

<?php 

// Note: If you have input files large than 200kb we highly recommend to check "async" mode example.

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


// 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
// * If you already have the direct PDF file link, go to the step 3.

// Create URL
$url = "https://api.pdf.co/v1/file/upload/get-presigned-url" . 
    "?name=" . $_FILES["file"]["name"] .
    "&contenttype=application/octet-stream";
    
// 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);
        
        // Get URL to use for the file upload
        $uploadFileUrl = $json["presignedUrl"];
        // Get URL of uploaded file to use with later API calls
        $uploadedFileUrl = $json["url"];
        
        // 2. UPLOAD THE FILE TO CLOUD.
        
        $localFile = $_FILES["file"]["tmp_name"];
        $fileHandle = fopen($localFile, "r");
        
        curl_setopt($curl, CURLOPT_URL, $uploadFileUrl);
        curl_setopt($curl, CURLOPT_HTTPHEADER, array("content-type: application/octet-stream"));
        curl_setopt($curl, CURLOPT_PUT, true);
        curl_setopt($curl, CURLOPT_INFILE, $fileHandle);
        curl_setopt($curl, CURLOPT_INFILESIZE, filesize($localFile));

        // Execute request
        curl_exec($curl);
        
        fclose($fileHandle);
        
        if (curl_errno($curl) == 0)
        {
            $status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
            
            if ($status_code == 200)
            {
                // 3. READ BARCODES FROM UPLOADED IMAGE OR PDF DOCUMENT
                
                ReadBarcodes($apiKey, $barcodeTypesToFind, $uploadedFileUrl, $pages);
            }
            else
            {
                // Display request error
                echo "<p>Status code: " . $status_code . "</p>"; 
                echo "<p>" . $result . "</p>"; 
            }
        }
        else
        {
            // Display CURL error
            echo "Error: " . curl_error($curl);
        }
    }
    else
    {
        // Display service reported error
        echo "<p>Status code: " . $status_code . "</p>"; 
        echo "<p>" . $result . "</p>"; 
    }
    
    curl_close($curl);
}
else
{
    // Display CURL error
    echo "Error: " . curl_error($curl);
}

function ReadBarcodes($apiKey, $barcodeTypesToFind, $uploadedFileUrl, $pages) 
{
    // Prepare URL for `Barcode Reader` API call
    $url = "https://api.pdf.co/v1/barcode/read/from/url";
    
    // Prepare requests params
    $parameters = array();
    $parameters["types"] = join(",", $barcodeTypesToFind);
    $parameters["pages"] = $pages;
    $parameters["url"] = $uploadedFileUrl;

    // 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)
            {
                // Display decoding results
                $barcodes = $json["barcodes"];
                foreach ($barcodes as $barcode) 
                {
                    echo "<h2>Found barcode:</h2>";
                    echo "<p>Type: " . $barcode["TypeName"] . "</p>";
                    echo "<p>Value: " . $barcode["Value"] . "</p>";
                    echo "<p>Document Page Index: " . $barcode["Page"] . "</p>";
                    echo "<p>Rectangle: " . $barcode["Rect"] . "</p>";
                    echo "<p>Confidence: " . $barcode["Confidence"] . "</p>";
                    echo "<br/>";
                }
            }
            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);
    }
}

?>

</body>
</html>
sample.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Barcode Reader Cloud API Example</title>
</head>

<body>

    <form name="form1" enctype="multipart/form-data" method="post" action="read-barcode.php">
        <p>
            <label>Authentication key (API Key). Get your own by registering at <a href="https://apidocs.pdf.co">https://apidocs.pdf.co</a>.</label>
            <br/>
            <input type="text" name="apiKey" placeholder="API Key"/>
        </p>
        <p>
            <label>Barcode types to find. Select only expected types for faster decoding and less false positives.</label>
            </br>
            <select multiple="multiple" size="10" name="barcodeTypesToFind[]">
                <option selected="selected">All</option>
                <option>All1D</option>
                <option>All2D</option>
                <option>AllOMRElements</option>
                <option>AustralianPostCode</option>
                <option>Aztec</option>
                <option>CircularI2of5</option>
                <option>Codabar</option>
                <option>CodablockF</option>
                <option>Code128</option>
                <option>Code16K</option>
                <option>Code39</option>
                <option>Code39Extended</option>
                <option>Code39Mod43</option>
                <option>Code39Mod43Extended</option>
                <option>Code93</option>
                <option>DataMatrix</option>
                <option>EAN13</option>
                <option>EAN2</option>
                <option>EAN5</option>
                <option>EAN8</option>
                <option>GS1</option>
                <option>GS1DataBarExpanded</option>
                <option>GS1DataBarExpandedStacked</option>
                <option>GS1DataBarLimited</option>
                <option>GS1DataBarOmnidirectional</option>
                <option>GS1DataBarStacked</option>
                <option>GTIN12</option>
                <option>GTIN13</option>
                <option>GTIN14</option>
                <option>GTIN8</option>
                <option>IntelligentMail</option>
                <option>Interleaved2of5</option>
                <option>ITF14</option>
                <option>MaxiCode</option>
                <option>MICR</option>
                <option>MicroPDF</option>
                <option>MSI</option>
                <option>PatchCode</option>
                <option>PDF417</option>
                <option>Pharmacode</option>
                <option>PostNet</option>
                <option>PZN</option>
                <option>QRCode</option>
                <option>RoyalMail</option>
                <option>RoyalMailKIX</option>
                <option>Trioptic</option>
                <option>UPCA</option>
                <option>UPCE</option>
                <option>UPU</option>
                <option>Checkbox</option>
                <option>Circle</option>
                <option>Oval</option>
                <option>UnderlinedField</option>
                <option>HorizontalLine</option>
                <option>VerticalLine</option>
                <option>Segment</option>
            </select>
        </p>
        <p>
            <label>Input File (*.pdf, *.jpg, *.png, *.tif, *.gif, *.bmp)</label>
            </br>
            <input type="hidden" name="MAX_FILE_SIZE" value="8000000"/>
            <input type="file" name="file"/>
        </p>
        <p>
            <label>Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.</label>
            <br/>
            <input type="number" name="pages" value="0">
        </p>
        <input type="submit" name="submit" value="Proceed" />
    </form>

</body>
</html>

PDF.co Web API: the Web API with a set of tools for documents manipulation, data conversion, data extraction, splitting and merging of documents. Includes image recognition, built-in OCR, barcode generation and barcode decoders to decode bar codes from scans, pictures and pdf.

Get your PDF.co API key here!

Download Source Code (.zip)

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