What are some potential issues when using the flush() function in PHP to output data during script execution?

One potential issue when using the flush() function in PHP to output data during script execution is that it may not work as expected if output buffering is enabled. To solve this issue, you can use ob_flush() to flush the output buffer before calling flush(). 

// Disable output buffering
while (ob_get_level()) {
    ob_end_flush();
}

// Flush output
flush();

Keywords

flush output buffering buffering server response data transmission

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