Find specific text until it is found it stops - php

Question

I was wondering how to do it, this code will as you know get specific line, now I need it to read until a specific text like 55 and stops reading from there. As you can see the log contains some whitespace so what function can I use to read until the code 55?
$row['MtID'] = A unique ID to specify the line where the result is.
So for example the log of the result will be
MM3,67624563 (Unique ID (MtID),233262345599,http://mywebsite.com:8080/web/mm3_pixel.php?sspdata=ams1CIv44qa26LGkchACGKqShLrCtZieSyINNDEuMTkwLjg4LjIwOCgB&vurlid=993211,http://mywebsite.net/sspx?id=69171&sspdata=ams1CIv44qa26LGkchACGKqShLrCtZieSyINNDEuMTkwLjg4LjIwOCgB >> OK
,55
$logfile = file("https://myweb.com/Pixel-Full.php?file=".$country."/".$today."-pixel-response.log");
foreach($logfile as $line_num = > $line) {
if (strpos($line, $row['MtID']) !== false) {
$getresult = strstr(htmlspecialchars($line), 'http://');
echo "<td>".$getresult."</td>";
}
}
This system goes like this, a user request something and nothing found, so on our log, it will post the error link requested by user and the error code for us to know what problem it was. So once the system reads the line and continue to read other line as well until it found the code, it stops

Answer 1

$startline = count($logfile)+1;
foreach($logfile as $line_num => $line) {
if (strpos($line, $row['MtID']) !== false) {
$startline = $line_num;
$getresult = trim(strstr(htmlspecialchars($line), 'http://'));
if (strpos($getresult, ",55") !== false) {
$getresult = substr($getresult,0,strpos($getresult, ",55")+3);
break;
}
}
if ($line_num > $startline) {
$getresult .= trim(htmlspecialchars($line));
if (strpos($getresult, ",55") !== false) {
$getresult = substr($getresult,0,strpos($getresult, ",55")+3);
break;
}
}
}
echo "<td>".$getresult."</td>";

Answer 2

You can use the FILE_SKIP_EMPTY_LINES flag in the file call to skip empty lines and then use array_slice to get the part of the array you need.
$file = array_slice(file("https://myweb.com/Pixel-Full.php?file={$country}/{$today}-pixel-response.log", FILE_SKIP_EMPTY_LINES), 0, $row['MtID']);
foreach($file as $line) {
$result = strstr(htmlspecialchars($line), 'http://');
echo "<td>{$result}</td>";
}

Answer 3

It looks like stopping the execution when a positive match is the biggest trick here. This can be done with a break. (http://php.net/manual/en/control-structures.break.php)
//get the file as a string
$logfile = file_get_contents("https://myweb.com/Pixel-Full.php?file=".$country."/".$today."-pixel-response.log", false);
//make up some rows and catch the false
if ($logfile !== false) {
$logrows = explode("\n", $logfile);
//loop
foreach($logrows as $line) {
if (strpos($line, $row['MtID']) !== false) {
$getresult = strstr(htmlspecialchars($line), 'http://');
echo "<td>".$getresult."</td>";
break;
}
}
}
else echo "Log resource unavailable";
//some memory clearing
unset($logfile);
unset($logrows);
I would suggest for matching sanity that you make sure that the logging format makes the MtID variable something that wouldn't be found in the log text unless its a positive match. Using a UUID or a specific ID format would work.

Answer 4

As you regarded, sometimes, the log line may be divided into three lines while in some other times it is only one line:
// Three lines
http://www.yourwebsite.com/error/33/happycodingneverending&errorcode=33,
succcess=false;
,55
// one line
http://www.yourwebsite.com/error/33/happycodingneverending&errorcode=33,succcess=false;,55
In this case you just have to made a little modification to your code, which, works perfect with only one line example to works with that three lines as follows:
foreach($logfile as $line_num = > $line) {
if (strpos($line, $row['MtID']) !== false) {
$getresult = strstr(htmlspecialchars($line), 'http://');
if(!$getresult){
$theExactLine = $line_num - 2;
$getresult = $logfile[$theExactLine];
}
echo "<td>".$getresult."</td>";
break; // to stop looping.
}
}