I'm see some code from jsmin-php like follow:

<?php
error_reporting(E_STRICT);

fwrite(STDERR, memory_get_peak_usage(true)."\n");

require './jsmin.php';
echo JSMin::minify(file_get_contents('ext-all-debug.js'));

fwrite(STDERR, memory_get_peak_usage(true)."\n");
?>

I have some question about code
1.what is E_STRICT error level mean?I'm found an explain at
http://www.php.net/manual/en/errorfunc.constants.php
but i don't understand which situation need this level?
2.document for STDERR is at http://php.net/manual/en/wrappers.php.php
but why it write some output to STDERR ?

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