How can PHP developers ensure efficient memory usage when processing large files line by line?

When processing large files line by line in PHP, developers can ensure efficient memory usage by reading and processing the file line by line instead of loading the entire file into memory at once. This can be achieved using functions like `fgets()` or `SplFileObject` in a loop to handle each line individually, minimizing the memory footprint of the script. 

$filename = 'large_file.txt';
$file = fopen($filename, 'r');

if ($file) {
    while (($line = fgets($file)) !== false) {
        // Process each line here
    }

    fclose($file);
}

Keywords

PHP memory management file processing large files line by line

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