PHP read last few lines of the file without copying the entire file to memory -

well know can use this:

<?php $myfile = 'myfile.txt'; $command = "tac $myfile > /tmp/myfilereversed.txt"; exec($command); $currentrow = 0; $numrows = 20;  // stops after number of rows $handle = fopen("/tmp/myfilereversed.txt", "r"); while (!feof($handle) && $currentrow <= $numrows) {    $currentrow++;    $buffer = fgets($handle, 4096);    echo $buffer."<br>"; } fclose($handle); ?> 

but doesn't copy whole file memory?

a better approach maybe fread() uses bytes might not approach too.

my file can go around 100mb want it.

if you're doing stuff on command line, why not use tail directly:

$myfile = 'myfile.txt'; $command = "tail -20 $myfile"; $lines = explode("\n", shell_exec($command)); 

not tested, should work without php having read whole file.