PHP Basic 28: File read

<?PHP//1. Append file contents//$fp = fopen ("Test.txt", "a");    $outString = "This is gaoxiong\n";    Fwrite ($fp, $outString);        Fclose ($FP);    Reads a character//$fp = fopen ("Test.txt", "R");    echo fgetc ($FP);    echo fgetc ($FP);    echo fgetc ($FP);    echo fgetc ($FP);        Fclose ($FP);    Reads a row//$fp = fopen ("Test.txt", "R");    Echo fgets ($FP);    Fclose ($FP); Filter HTML//FGETSS ()//The remaining data at the output file pointer    $fp=fopen("Test.txt", "R"); Fpassthru($fp);//itself will output characters to the browser, returning a character length    fclose($fp);?>

PHP Basic 28: File read