In this case we want to get the average of values but we also want to ignore certain values, say if when the deviceType column
Using the preg_replace function you can easily replace all characters in a string that are not alphanumeric. This can be useful for sanitizing a string
You can do this simply with an onclick event like below.
This example will work fairly well cross-browser. In IE it will use new Image and everything else it will use createElement. There are bugs in
Using the substring function, this example below will select the leftmost 6 characters from a string field named “field_name” in the table tbl_stuff with mysql.
After you run a query on MySQL server you may get warning messages. To see the complete warnings you simply run the command show warnings.
When you download software online often the publisher will also provide a file hash to make sure that the file hasn’t been modified or hacked
The built-in function coalesce in MySQL is great for outer joins where the return or expected answer can be null. Coalesce can be used anytime
This is a simple screenshot server running over http. You append a url (a urlencoded url) to the server and it returns a PNG image
Both htmlentities and htmlspecialchars work the same way in that they are used to emit a string of user input that may contain raw HTML