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<html>
<head>
<title>My Awesome CMS – Page Title</title>
</head>
<body>
</body>
</html>
</head>
tag. <link href=”../assets/css/style.css” type=”text/css” rel=”stylesheet”/>
<?php
tag. <div id="myfirstid"></div>
<div class="myfirstclass"></div>
<div class="myfirstclass"></div>
<div class="myfirstclass"></div>
<div class="myfirstclass"></div>
<div class="myfirstclass"></div>
#myfirstid{
Background:lightblue;
Font-family:Arial;
Font-size:44px;
Font-weight: Bold;
}
.myfirstclass{
Font-size:15px;
Color: darkblue;
}
include(‘includes/header.php’);
<divs>
we used for practice earlier, we have something better in store! include(‘includes/footer.php’);
foreach($getmydata as $mydata){ echo "Title: "; echo $mydata['title']; echo "<br/>"; echo "Content: "; echo $mydata['content']; echo "<br/>"; echo "Author: "; echo $mydata['author']; echo "<br/>"; echo "<br/>";
?>
<div id=”myfirstid”>
<?php
foreach($getmydata as $mydata){
echo "<div class=”myfirstclass”>Title: ";
echo $mydata['title'];
echo "<br/>";
echo "Content: ";
echo $mydata['content'];
echo "<br/>";
echo "Author: ";
echo $mydata['author'];
echo "</div><br/><br/>";
}?>
</div>
<?php
<?php
include('includes/header.php');
include('includes/conn.php');
if ($letsconnect -> connect_errno) { echo "Error " . $letsconnect -> connect_error;
}else{
$getmydata=$letsconnect -> query("SELECT * FROM content");
?>
<div id="myfirstid">
<?php
foreach($getmydata as $mydata){
echo "<div class=”myfirstclass”>Title: ";
echo $mydata['title'];
echo "<br/>";
echo "Content: ";
echo $mydata['content'];
echo "<br/>";
echo "Author: ";
echo $mydata['author'];
echo "</div><br/><br/>";
}
?>
</div>
<?php
}
$letsconnect -> close();
include('includes/footer.php');
?>
Me: Is that really important that the tables are MyISAM? It's 2018, you know.. There are dozens of queries in queue waiting for table-level locks.
R**: Are they MyISAM? Really?
Me: Yes.. Any objection against converting them to InnoDB? With the current state of the website, with all those tons of Gateway Timeouts, it's not going to make it worse if I do it right now..
Me: Nah, it didn't help a lot.. But, looking at the SHOW PROCESSLIST output, I see something weird. What, do you think, this query does? SELECT LAST_INSERT_ID() FROM images?
R**: ehh... Gets you the last AUTO_INCREMENT id from images table?
Me: Let's play another good news bad news joke.. Good news: you're right, it gets you the last AUTO_INCREMENT id. Bad news: it's not for table, it's for the session. Worse news: this query gets you the last AUTO_INCREMENT id and does it exactly as many times as there are rows in the images table. how many are there?
R**: about 8mln. #@%&! It's sending 8mln rows on every image upload, through the network!
Me: Bingo! 8mln rows, with one and the same integer value in all of them.
R**: Ouch... Aaaand... Before today, it was not an issue. Because the database was on the same server as the application..
Me: Exactly, it used the loopback interface, and now it's using ehternet, which, apparently, doesn't have a super good bandwidth. We don't have a gigabit channel between servers, do we?
R**: No, it's 100 Mbit
Me: Are you fixing the query, BTW?
R**: yeah, man, deploying it...
WebSockets have compatibility with 96.5% of clients globally
OnConnection
method.OnOpen
gets called when a new connection is made.OnClose
gets called when a client quits. It's essential to keep an eye on memory management, and essential to keep tidying up as you move through the code.OnError
gets called when there is an exception faced by the user.OnMessage
gives the text of the JSON message, which is being exchanged with the client.Your biggest asset is also your biggest risk... your developers