Question

How can I delete some lines(“\r\n”) from a binary data:
for example if I have $data which is the content of a binary file I’m getting from my database and wanted to delete the first five lines from it.

How can this be done in php?

Answer 1

// Load the file into memory
$fileData = file_get_contents('myfile.bin');

// Split it by CRLF sequences
$fileData = explode("\r\n", $fileData);

// Remove the first 5 lines
$fileData = array_slice($fileData, 5);

// Turn it back into a string
$fileData = implode("\r\n", $fileData);

// Write it back to the file
file_put_contents('myfile.bin', $fileData);

Or, in one line:

file_put_contents('myfile.bin', implode("\r\n", array_slice(explode("\r\n", file_get_contents('myfile.bin')), 5)));

But if you want to do this with “binary data”, I would question whether it really is binary data.