In what scenarios would using filemtime in PHP be a reliable option for verifying the completeness of a file before processing it?

Using filemtime in PHP can be a reliable option for verifying the completeness of a file before processing it when the file is being constantly updated by another process. By comparing the file's modification time before and after attempting to read it, you can ensure that the file has been fully written and is ready for processing. 

$filename = 'example.txt';

$lastModifiedTime = filemtime($filename);

// Wait for the file to be fully written
while (filemtime($filename) != $lastModifiedTime) {
    sleep(1);
}

// File is now complete and ready for processing
$data = file_get_contents($filename);

// Process the file data

Keywords

filemtime PHP file processing completeness verification reliability

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