php echo to a txt file

I create my ouput string and then:

 echo $output;

It goes to the display

How can I send it to a text file instead?
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do you want to add to a file or write to a new file?
If you want to add to a file then you can do this
$reused = file_get_contents($pathToFile);<-- this gives you a string of current file contents
$add = "New content"
$updated = $reused . $add;
file_put_contents($pathToFIle, $updated);<-- writes out updated file

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If you want just a new file that you can skip the first part and just do the file_put_contents to write out a brand new file.
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