What debugging techniques can be used to troubleshoot cURL download issues in PHP, such as using CURLOPT_PROGRESSFUNCTION or packet dumps?

When troubleshooting cURL download issues in PHP, you can use CURLOPT_PROGRESSFUNCTION to track the download progress and identify any potential issues. Additionally, packet dumps can be helpful in analyzing the network traffic and identifying any errors or bottlenecks in the download process. 

<?php

$ch = curl_init();
$file = fopen("output.txt", "w");

curl_setopt($ch, CURLOPT_URL, "https://www.example.com/file.zip");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FILE, $file);

// Set up progress function to track download progress
curl_setopt($ch, CURLOPT_NOPROGRESS, false);
curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, function($resource, $download_size, $downloaded, $upload_size, $uploaded) {
    echo "Downloaded: " . $downloaded . " bytes\n";
    return 0;
});

$result = curl_exec($ch);

if($result === false) {
    echo "Error: " . curl_error($ch);
}

curl_close($ch);
fclose($file);

?>

Keywords

cURL CURLOPT_PROGRESSFUNCTION packet dumps troubleshooting debugging

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