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

Question

I am working with large text files in php (1GB+), I am using

file_get_contents(\"file.txt\", NULL, NULL, 100000000,100); 

To get data from

Answer 1

A variant on Baba's answer, not sure if it would be more efficient when working with larger files:

function injectData($file, $data, $position) {
    $fpFile = fopen($file, "rw+");
    $fpTemp = fopen('php://temp', "rw+");
    stream_copy_to_stream($fpFile, $fpTemp, $position);
    fwrite($fpTemp, $data);
    stream_copy_to_stream($fpFile, $fpTemp, -1, $position);

    rewind($fpFile);
    rewind($fpTemp);
    stream_copy_to_stream($fpTemp, $fpFile);

    fclose($fpFile);
    fclose($fpTemp);
}

injectData('testFile.txt', 'JKL', 3);

Variant of my earlier method that eliminates one of the stream_copy_to_stream() calls, so should be a shade faster:

function injectData3($file, $data, $position) {
    $fpFile = fopen($file, "rw+");
    $fpTemp = fopen('php://temp', "rw+");
    stream_copy_to_stream($fpFile, $fpTemp, -1, $position);
    fseek($fpFile, $position);
    fwrite($fpFile, $data);
    rewind($fpTemp);
    stream_copy_to_stream($fpTemp, $fpFile);

    fclose($fpFile);
    fclose($fpTemp);
}