text_reverse.php

//source file
$source = "konzerte.txt";
 
//put the lines of the files in the lines-array
$lines = file($source);
 
//reverse the lines-array
$lines = array_reverse($lines);
 
//put the elements of the reversed array together
foreach ($lines as $element) {
    $text .= $element;
}
 
//output file
$output = "bla.txt";
 
//open the output file and create it if it doesn't exist
$handler = fOpen($output, "a+");
 
//write the file
fWrite($handler , $text);