What are the best practices for handling large datasets in PHP, especially when dealing with files that exceed memory limits?

When dealing with large datasets in PHP that exceed memory limits, it is best to process the data in smaller chunks rather than loading the entire dataset into memory at once. One approach is to read the data from the file line by line or in smaller batches, process each chunk, and then move on to the next chunk. This helps to avoid memory exhaustion and ensures efficient processing of large datasets. 

// Open the file for reading
$handle = fopen('large_dataset.csv', 'r');

// Process the file line by line
while (($data = fgetcsv($handle)) !== false) {
    // Process the current data chunk
    // Example: echo the data
    echo implode(',', $data) . PHP_EOL;
}

// Close the file
fclose($handle);

Keywords

memory management file handling PHP functions data processing memory limits

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