让我们用一种新方法来修改这个问题……我有三个文件:logtail.php、ajax.js 和 index.php。我的目标是创建一个系统日志查看器(Linux)。
在 index.php 上,我创建了一个 div,我只想显示过滤后的 syslog 内容。我必须过滤 logtail.php 中的内容。我必须使用 shell_exec 和 | 使用多个不同的正则表达式 grep 内容。现在我| grep 整个 syslog 文件,它会在日志查看器中实时显示,但我的过滤器没有按计划工作。
我需要帮助弄清楚如何使用 $_GET 仅从系统日志中获取用户想要查看的内容。我的 index.php 文件中有一个为此准备的文本字段和提交按钮。我应该使用函数(已经尝试过)吗?还是有更好的方法?你能给我一些例子吗?
logtail.php
//Executes a shell script to grab all file contents from syslog on the device
//Explodes that content into an array by new line, sorts from most recent entry to oldest entry
if (file_exists($filename = '/var/log/syslog')) {
$syslogContent = shell_exec("cat $filename | grep -e '.*' $filename");
$contentArray = explode("\n", $syslogContent);
rsort($contentArray);
print_r($contentArray);
}
ajax.js(正常工作)
function createRequest() {
var request = null;
try {
request = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
request = null;
}
}
}
if (request == null) {
return alert("Error creating request object!");
} else {
return request;
}
}
var request = createRequest();
function getLog(timer) {
var url = 'logtail.php';
request.open("GET", url, true);
request.onreadystatechange = updatePage;
request.send(null);
startTail(timer);
}
function startTail(timer) {
if (timer == "stop") {
stopTail();
} else {
t = setTimeout("getLog()",1000);
}
}
function stopTail() {
clearTimeout(t);
var pause = "The log viewer has been paused. To begin viewing again, click the Start Log button.\n";
logDiv = document.getElementById("log");
var newNode = document.createTextNode(pause);
logDiv.replaceChild(newNode,logDiv.childNodes[0]);
}
function updatePage() {
if (request.readyState == 4) {
if (request.status == 200) {
var currentLogValue = request.responseText.split("\n");
eval(currentLogValue);
logDiv = document.getElementById("log");
var logLine = ' ';
for (i = 0; i < currentLogValue.length - 1; i++) {
logLine += currentLogValue[i] + "<br/>\n";
}
logDiv.innerHTML = logLine;
} else
alert("Error! Request status is " + request.status);
}
}
index.php
<script type="text/javascript" src="scripts/ajax.js"></script>
<button style="margin-left:25px;" onclick="getLog('start');">Start Log</button>
<button onclick="stopTail();">Stop Log</button>
<form action="" method="get"> //This is where the filter options would be
Date & Time (ex. Nov 03 07:24:57): <input type="text" name="dateTime" />
<input type="submit" value="submit" />
</form>
<br>
<div id="log" style="...">
//This is where the log contents are displayed
</div>