Extract Images from PDF Asynchronously - PHP
PDF To JSON sample in PHP demonstrating ‘Extract Images from PDF Asynchronously’
extract-images-async.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Extract Images from PDF - Results</title>
</head>
<body>
<?php
// Validate inputs
if (!isset($_POST["apiKey"], $_POST["pages"], $_FILES["file"]["tmp_name"])) {
die("Error: Missing required form parameters.");
}
$apiKey = htmlspecialchars($_POST["apiKey"]);
$pages = htmlspecialchars($_POST["pages"]);
$fileName = htmlspecialchars($_FILES["file"]["name"]);
$localFile = $_FILES["file"]["tmp_name"];
// 1. Retrieve the presigned URL for file upload
$url = "https://api.pdf.co/v1/file/upload/get-presigned-url" .
"?name=" . urlencode($fileName) .
"&contenttype=application/octet-stream";
$curl = curl_init();
curl_setopt($curl, CURLOPT_HTTPHEADER, array("x-api-key: " . $apiKey));
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
if (curl_errno($curl) == 0) {
$status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($status_code == 200) {
$json = json_decode($result, true);
$uploadFileUrl = $json["presignedUrl"];
$uploadedFileUrl = $json["url"];
// 2. Upload the file to cloud
$fileHandle = fopen($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($localFile));
curl_exec($curl);
fclose($fileHandle);
if (curl_errno($curl) == 0) {
$status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($status_code == 200) {
// 3. Extract images from the uploaded PDF
ExtractJSON($apiKey, $uploadedFileUrl, $pages);
} else {
echo "<p>Status code: " . $status_code . "</p>";
echo "<p>Error: " . $result . "</p>";
}
} else {
echo "Error: " . curl_error($curl);
}
} else {
echo "<p>Status code: " . $status_code . "</p>";
echo "<p>Error: " . $result . "</p>";
}
}
curl_close($curl);
function ExtractJSON($apiKey, $uploadedFileUrl, $pages)
{
$url = "https://api.pdf.co/v1/pdf/convert/to/json2";
$parameters = array();
$parameters["url"] = $uploadedFileUrl;
$parameters["inline"] = true;
$parameters["pages"] = $pages;
$parameters["profiles"] = '{ "SaveImages": "Embed" }';
$parameters["async"] = true; // Ensure async mode is explicitly set
$data = json_encode($parameters);
$curl = curl_init();
curl_setopt($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);
$result = curl_exec($curl);
if (curl_errno($curl) == 0) {
$status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($status_code == 200) {
$json = json_decode($result, true);
if (isset($json["jobId"])) {
CheckJobStatusAndFetchResult($json["jobId"], $apiKey, $json["url"]);
} else {
echo "<p>Error: No job ID returned in the response.</p>";
}
} else {
echo "<p>Status code: " . $status_code . "</p>";
echo "<p>Error: " . $result . "</p>";
}
} else {
echo "Error: " . curl_error($curl);
}
curl_close($curl);
}
function CheckJobStatusAndFetchResult($jobId, $apiKey, $jsonUrl)
{
$url = "https://api.pdf.co/v1/job/check";
$retryCount = 0;
$maxRetries = 30;
do {
$parameters = array("jobid" => $jobId);
$data = json_encode($parameters);
$curl = curl_init();
curl_setopt($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);
$result = curl_exec($curl);
if (curl_errno($curl) == 0) {
$status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($status_code == 200) {
$json = json_decode($result, true);
if (!isset($json["error"]) || $json["error"] == false) {
if ($json["status"] == "success") {
echo "<p>Job ID: $jobId</p>";
echo "<p>JSON URL: <a href='$jsonUrl' target='_blank'>$jsonUrl</a></p>";
if (isset($jsonUrl)) {
$jsonContent = file_get_contents($jsonUrl);
echo "<pre>Extracted JSON Content: " . htmlspecialchars($jsonContent) . "</pre>";
} else {
echo "<p>Error: No URL found in the job result.</p>";
}
break;
} elseif ($json["status"] == "working") {
sleep(3);
} else {
echo "<p>Job failed with status: " . $json["status"] . "</p>";
break;
}
} else {
echo "<p>Error: " . $json["message"] . "</p>";
break;
}
} else {
echo "<p>Status code: " . $status_code . "</p>";
echo "<p>Error: " . $result . "</p>";
break;
}
} else {
echo "Error: " . curl_error($curl);
break;
}
$retryCount++;
curl_close($curl);
} while ($retryCount < $maxRetries);
}
?>
</body>
</html>
sample.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Extract Images from PDF</title>
</head>
<body>
<form name="form1" enctype="multipart/form-data" method="post" action="extract-images-async.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 File (*.pdf)</label>
<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>
<input type="text" name="pages">
</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.