What are some alternative solutions to continuously checking for file existence in PHP?

Checking for file existence in PHP can be resource-intensive if done continuously, especially if the file is being checked frequently. One alternative solution is to cache the file existence status in a variable and only update it when necessary. Another option is to use file modification timestamps to determine if the file has been updated since the last check. These approaches can help reduce the number of file system calls and improve performance. 

// Check file existence and cache the result
$fileExists = file_exists('example.txt');

// Use the cached result to check if the file exists
if ($fileExists) {
    echo 'File exists';
} else {
    echo 'File does not exist';
}

Keywords

file_exists polling inotify event-driven filesystem notifications

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