[PHP-users 28805] 難しいソートについて

[reima]

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http://ns1.php.gr.jp/pipermail/php-users/2002-June/007909.html
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function compare($a, $b) {
    $sa = split("<>", $a);
    $sb = split("<>", $b);
    if ($sa[1] == $sb[1]) return 0;
    return ($sa[1] > $sb[1]) ? -1 : 1;
}

function log_sort($sdata){
	usort($sdata,compare);
	foreach($sdata as $key => $val){
		$new_data[]=$val;
	}
	return $new_data;
}

$log_file="./data/log.dat";

$lines = file($log_file);
$out_data = log_sort($lines);

$fp = fopen($log_file,"w");
flock($fp,2);
fputs($fp,$out_data);
fclose($fp);

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PHP$B4D6-(B
OS:Windows 2000 Pro Sp4
Web:Apache2.0.5.4
PHP:5.1.2