What are common issues encountered when using PHP FTP functions for downloading and deleting large files?

Common issues encountered when using PHP FTP functions for downloading and deleting large files include timeouts due to slow network connections, memory exhaustion when handling large files, and incomplete file transfers. To solve these issues, you can increase the timeout limit, handle the file transfer in chunks to avoid memory exhaustion, and check for any errors during the transfer to ensure the file is downloaded or deleted successfully. 

// Increase the timeout limit
ini_set('max_execution_time', 300); // 5 minutes

// Download large file in chunks
$remoteFile = 'example.txt';
$localFile = 'downloaded_example.txt';

$ftp = ftp_connect('ftp.example.com');
ftp_login($ftp, 'username', 'password');

$handle = fopen($localFile, 'w');
ftp_fget($ftp, $handle, $remoteFile, FTP_BINARY, 0, 1024*1024); // 1MB chunks

fclose($handle);
ftp_close($ftp);

// Check for errors during transfer
if (file_exists($localFile)) {
    echo 'File downloaded successfully.';
} else {
    echo 'Error downloading file.';
}

Keywords

PHP FTP functions large files downloading deleting

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