So you want to write a sync system for a web app with offline and realtime support? Good luck. You might find the following resources useful.
Database in a browser, a spec (Stepan Parunashvili)
What problem are we trying to solve with a sync system?
The web of tomorrow (Nikita Prokopov)
This is a list of general-purpose optimizations for C programs, from the most impactful to the tiniest low-level micro-optimizations to squeeze out every last bit of performance. It is meant to be read top-down as a checklist, with each item being a potential optimization to consider. Everything is in order of speed gain.
Choose the best algorithm and data structure for the problem at hand by evaluating:
| <?php | |
| $host = "db hostname"; | |
| $dbname = "db name"; | |
| $user = "db username"; | |
| $pass = "db password"; | |
| $charset = "UTF8MB4"; // if your db does not use CHARSET=UTF8MB4, you should probably be fixing that | |
| $dsn = "mysql:host={$host};dbname={$dbname};charset={$charset}"; |
| <?php | |
| // let's make a query. | |
| // only sql. NO DATA! put a named parameter where the data would normally go. | |
| // parameters start with a ":", contain letters, numbers, and underscores only, and are not quoted. | |
| const SQL_SELECT = 'SELECT foo, bar, baz FROM myTable WHERE quxx = :quxx'; | |
| // that's the parameter marker ---^ | |
| // prepare the statement. | |
| $selectStmt = $pdo->prepare(SQL_SELECT); |
Here's a very common pattern. People recommend it everywhere. Put your config into a separate file, and require it in your script. Awesome, right!?
Halfway. Yes, doing it is better than not. BUT now you have a bunch of invisible variables in your script! This makes for code that is hard to read and debug, and is fragile because code that directly affects your script is far away from it.
Imagine you got a warning like "undefined index 'foo' …" one day. It seems obvious now — the config file is messed up. But what if there were a ton of other stuff going on around this? What if this happens six months later (when you've completely forgotten about where $config comes from)? Even worse, what if a second config file gets included somewhere in the same scope and these invisible variables start colliding!?
BAD.config.php
<?php
$config["foo"] = "Hello, World!";
say you have two arrays, $a1 and $a2, and you want to combine them.
<?php
$a1 = [
'a' => 'foo',
'b' => ['bar']
];
$a2 = [
'a' => 'bar',
The biggest issue with Herd Pro is that you cannot use Reverb out of the box with a site that has SSL enabled. Here is the workaround for it all to play nicely together.
First you will need to create two sites. The two I have here are as follows:
Of note is that I'm using Herd Pro as well, so all additional services are being used directly though Herd Pro itself.
OK, so you have a filepath made from user input; something like
$path = __DIR__ . "/uploads/{$user_input_filename}"
#1: DO NOT DO THIS. Make up your own directory names. The user has no business picking path names on your server.
#2: Filesystem traversal is bad. If you mean for the given $user_input_filename to be inside the __DIR__ . "/uploads/ directory, take a moment to check.
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