我已经用jquery、php和ajax做了一个聊天系统，我希望聊天窗口显示html日志的最后10行。
日志.html如下所示：
<div class='msgln'><b>Brian</b>: dd<br></div><div class='msgln'><b>Brian</b>: ddf<br></div><div class='msgln'><b>Arne</b>: PIS!<br></div><div class='msgln'><b>Brian</b>: sdfsdf sdfsdffds sdfdsf sdf sdf dfs dfsdf sdf sfd sfd fsd fsd sdf sdffsd sd fsdfsd fsd fsd<br></div><div class='msgln'><i>Brian er kommet på chatten.</i><br></div>
我的 php 现在看起来像这样：
echo "<div id='chatbox'>";
if(file_exists("log.html") && filesize("log.html") > 0){
$handle = fopen("log.html", "r");
$contents = fread($handle, filesize("log.html"));
fclose($handle);
$lastfifteenlines = array_slice(explode("<br>",file_get_contents($contents)),-10);
echo $lastfifteenlines;
}
echo "</div>";
但它显示了日志中的所有内容...
如何仅显示最后 10 行？br 发生的最后 10 次？
编辑：
Ajax 和 jquery：
function loadLog(){
var oldscrollHeight = $("#chatbox").attr("scrollHeight") - 20; //Scroll height before the request
$.ajax({
url: "log.html",
cache: false,
success: function(html){
$("#chatbox").html(html); //Insert chat log into the #chatbox div
//Auto-scroll
var newscrollHeight = $("#chatbox").attr("scrollHeight") - 20; //Scroll height after the request
if(newscrollHeight > oldscrollHeight){
$("#chatbox").animate({ scrollTop: newscrollHeight }, 'normal'); //Autoscroll to bottom of div
}
},
});
}
function get_last_lines($fp, $num)
{
$idx = 0;
$lines = array();
while(($line = fgets($fp)))
{
$lines[$idx] = $line;
$idx = ($idx + 1) % $num;
}
$p1 = array_slice($lines, $idx);
$p2 = array_slice($lines, 0, $idx);
$ordered_lines = array_merge($p1, $p2);
return $ordered_lines;
}
// Open the file and read the last 15 lines
$fp = fopen('log.html', 'r');
$lines = get_last_lines($fp, 15);
fclose($fp);
// Output array
print_r($lines);
自己试试这个。