这里我以mysql查询日志为源文件输入，直接显示到网页中查看。
<?php
$file = 'mysqld-slow.log';
$fp = fopen($file, "r");
$line = 5000;
$pos = -2;
$t = " ";
$data = " ";
while ($line > 0)
{
while ($t != "\n")
{
$flag = fseek($fp, $pos, SEEK_END);
if (fseek($fp, $pos, SEEK_END) == -1) {
rewind($fp);
$t = "\n";
$line = 0;
} else {
$t = fgetc($fp);
$pos--;
}
}
$t = " ";
$line--;
}
while(!feof($fp)){
$data .= fgets($fp);
$data .= '<br />';
}
fclose($fp);
echo $data
?><?php
$file = '/path/to/file';
$fp = fopen($file, "r");
$line = 2000;
$pos = -2;
$t = " ";
$data = " ";
while ($line > 0)
{
while ($t != "\n")
{
$flag = fseek($fp, $pos, SEEK_END);
if (fseek($fp, $pos, SEEK_END) == -1) {
rewind($fp);
$t = "\n";
$line = 0;
} else {
$t = fgetc($fp);
$pos--;
}
}
$t = " ";
$line--;
}
while(!feof($fp)){
$data .= fgets($fp);
$data .= '<br />';
}
fclose($fp);
echo $data
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