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Merge PDF Documents From Uploaded Files - PHP

PDF Merge sample in PHP demonstrating ‘Merge PDF Documents From Uploaded Files’

merge-pdf.php
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Image To PDF Conversion 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


// 1. UPLOAD FILES TO CLOUD
// If you already have direct file links, skip to Step 2.

$uploadedFiles = array();
$fileCount = count($_FILES["files"]["name"]);

for($i = 0; $i < $fileCount; $i++)
{
    // 1a. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
    
    // Create URL
    $url = "https://api.pdf.co/v1/file/upload/get-presigned-url" . 
        "?name=" . $_FILES["files"]["name"][$i] .
        "&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"];
            
            // 1b. UPLOAD THE FILE TO CLOUD.
            
            $tmpFilePath = $_FILES["files"]["tmp_name"][$i];
            
            $fileHandle = fopen($tmpFilePath, "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($tmpFilePath));
    
            // Execute request
            curl_exec($curl);
            
            if (curl_errno($curl) == 0)
            {
                $status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
                
                if ($status_code == 200)
                {
                    $uploadedFiles[] = $uploadedFileUrl;
                }
                else
                {
                    // Display request error
                    echo "<p>Status code: " . $status_code . "</p>"; 
                    echo "<p>" . $result . "</p>"; 
                }
            }
            else
            {
                // Display CURL error
                echo "Error: " . curl_error($curl);
            }
            
            fclose($fileHandle);
        }
        else
        {
            // Display request error
            echo "<p>Status code: " . $status_code . "</p>"; 
            echo "<p>" . $result . "</p>"; 
        }
    }
    else
    {
        // Display CURL error
        echo "Error: " . curl_error($curl);
    }
    
    curl_close($curl); 
}

// 2. MERGE UPLOADED PDF DOCUMENTS

if (count($uploadedFiles) > 0) 
{
    MergePdf($apiKey, $uploadedFiles);
}


function MergePdf($apiKey, $uploadedFiles) 
{
    // Create URL
    $url = "https://api.pdf.co/v1/pdf/merge";
    
    // Prepare requests params
    $parameters = array();
    $parameters["name"] = "result.pdf";
    $parameters["url"] = join(",", $uploadedFiles);

    // 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)
            {
                $resultFileUrl = $json["url"];
                
                // Display link to the result document
                echo "<div><h2>Conversion Result:</h2><a href='" . $resultFileUrl . "' target='_blank'>" . $resultFileUrl . "</a></div>";
            }
            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);
}


?>

</body>
</html>

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

<body>

    <form name="form1" enctype="multipart/form-data" method="post" action="merge-pdf.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>Input PDF Documents (*.pdf)</label>
            <input type="hidden" name="MAX_FILE_SIZE" value="8000000"/>
            <input type="file" name="files[]" multiple accept="application/pdf"/>
        </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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