How can PHP be used to check the last modified time of a file and replace it if it's older than a certain threshold?

To check the last modified time of a file in PHP and replace it if it's older than a certain threshold, you can use the `filemtime()` function to get the last modified time of the file and compare it with the current time. If the time-difference exceeds the threshold, you can replace the file using `copy()` or any other appropriate method. 

$filename = 'example.txt';
$threshold = 3600; // 1 hour threshold

if (file_exists($filename)) {
    $lastModifiedTime = filemtime($filename);
    $currentTime = time();

    if (($currentTime - $lastModifiedTime) > $threshold) {
        // Replace the file with a new one
        $newContent = "New content here";
        file_put_contents($filename, $newContent);
        echo "File replaced successfully!";
    } else {
        echo "File modification not required.";
    }
} else {
    echo "File does not exist.";
}

Keywords

PHP file modification time threshold replace file filemtime

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