PHP what is the best way to write data to middle of file without rewriting file

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To Overwrite Data :

$fp = fopen("file.txt", "rw+");
fseek($fp, 100000000); // move to the position
fwrite($fp, $string, 100); // Overwrite the data in this position 
fclose($fp);

To Inject Data

This is a tricky because you have to rewrite the file. It can be optimized with partial modificationfrom point of injection rather than the whole file

$string = "###INJECT THIS DATA ##### \n";
injectData("file.txt", $string, 100000000);

Function Used 

function injectData($file, $data, $position) {
    $fpFile = fopen($file, "rw+");
    $fpTemp = fopen('php://temp', "rw+");

    $len = stream_copy_to_stream($fpFile, $fpTemp); // make a copy

    fseek($fpFile, $position); // move to the position
    fseek($fpTemp, $position); // move to the position

    fwrite($fpFile, $data); // Add the data

    stream_copy_to_stream($fpTemp, $fpFile); // @Jack

    fclose($fpFile); // close file
    fclose($fpTemp); // close tmp
}

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