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As you get more confident with your PHP code, your code will get more and more complex. The PHP switch statement simplifies your PHP logic, replacing messy if statements when trying to make simple decisions based on the value of a variable. Read on to find out how to use it. PHP switch Syntax switch($v) { case $a: # Code to be executed if $v is equal to $a break; case $b: # Code to be executed if $v is equal to $b break; case $c: # Code to … Read more
#! – Usually nicknamed shebang, shabang, hashbang, poundbang – we’ll stick with shebang for the duration of this article. It is found at the beginning of countless Linux shell scripts – but what actually is it? Let’s break it down. It Usually Looks Something Like This #!/bin/bash The #! appears at the beginning of the file, usually on the first line, followed by the path to an executable (in this case, the bash shell). It’s a Comment It starts with a #, so it’s not executed as part of the script itself – it does affect how the … Read more
Knowing which version of MySQL you are running is vital when making sure your code is compatible and that you are using supported features. Here’s how to find out which you are running. For example, older versions of MySQL lack features for handling JSON data and modern character sets (including emojis!), so targeting the right MySQL version or making sure your MySQL version is up to date is pretty important if you want to support these popular functions! MariaDB is a drop-in replacement for MySQL, so … Read more
If you followed our article on how to SSH to your Raspberry Pi so that you can control it over a network, you might be tired of having to run the commands to find out what its current IP address is on your network. Most networks assign IP addresses dynamically, which means each device on the network is assigned an IP address from a pool of available IP addresses. The address for a specific device may change over time if it is rebooted or the address is automatically … Read more
This article shows you how to use the string.replace() method in Python to replace elements in a string of characters and includes useful examples. Python String replace Syntax The replace() function can be called on existing string variables like so: string.replace(find, new, count) Where: string is the existing string variable find is the string your want found and replaced new is the text you want to replace the found text count is the number of instances of the found text you want to be replaced, counted from the beginning of the … Read more
The title pretty much explains this project- it’s a tank, that can shoot BBs – powered by a Raspberry Pi and Python Code. It’s pretty awesome. This is part one of a two-parter and handles all of the hardware and wiring and a Python script for test firing the engines. Click here to see Part 2 of this project where I get a live video stream and buttons to control the tank into a web UI! As with my other projects, I’ll try to keep things simple … Read more
This simple guide explains how to check how much disk space is available in Ubuntu Linux. The df command tells you how much space is being used on each storage volume attached to your Linux system. To run it, simply execute the following command in your terminal: df Which outputs: Easy! But, it’s a bit difficult to read at a glance – the -h option makes everything human-readable: df -h Which outputs: However, there’s a lot of junk in there- we can ignore the /dev/loop* entries by omitting filesystems of the squashfs type: df … Read more
If you’re frequently interacting with Linux via the Bash shell, you’ll eventually want to customize it a bit – perhaps adding your own shortcuts, or setting up the environment to your liking, or even just adding some decorative personalization. This is what the Bash profile is for. It’s stored in your home directory and can be edited to set things up just the way you want each time you log in. Editing your Bash Profile To edit your bash profile, open it with the nano text editor … Read more
The Python range() function returns an immutable sequence of integers between a given start and endpoint, incrementing by a given amount. Python range Syntax Here’s the syntax for the Python range() function: range(start, stop, step) Note that: start is the integer to start incrementing from – it will be included in the range If it is not supplied, it will be assumed to be 0 stop is the integer to end the range at – it will NOT be included in the range – the range will end before the stop value If start and stop are the same, an empty … Read more
Being able to redirect the user to a different page in PHP can be useful if you’ve moved a page to a different location or want to send the user elsewhere – directing them to an access denied or error page instead of the page they were trying to access. This can be easily done using the PHP header() function. Using the PHP header() Function to Redirect to a Different Page To redirect the user to a different page, simply include the following PHP code: header(“Location: https://linuxscrew.com/”); … Read more
