What are the potential drawbacks of using flush() and ob_flush() functions in PHP scripts?

Using flush() and ob_flush() functions in PHP scripts can potentially cause performance issues, as they force the server to send output to the client before the script has finished executing. This can increase server load and slow down the overall processing of the script. To mitigate these drawbacks, it's recommended to use these functions judiciously and only when necessary, such as for real-time data streaming or long-running scripts. 

// Example of using flush() and ob_flush() functions judiciously
ob_start();

// Process data
for ($i = 0; $i < 10; $i++) {
    echo "Processing data...<br>";
    flush();
    ob_flush();
    sleep(1); // Simulate processing time
}

ob_end_flush();

Keywords

flush ob_flush buffering output performance

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