Ubuntu Unleashed 2019 Edition: Covering 18.04, 18.10, 19.04

r—Read-only; it overwrites the file. r+—Reading and writing; it overwrites the file. w—Write-only; it erases the ...

Click here to view code image <?php $file = fopen("filea.txt", "ab"); fwrite($file, "Testing\n"); fclose($ ...

} else { echo "Name was not set"; } if (isset($name)) { echo ...

string(6) "Graham" [1]=> string(6) "Julian" [2]=> string(4) "Nick" [ ...

<?php $string = "This is the best test in the west"; $result = preg_match_all("/[A-Za-z]est/", ...

$replace = "<em>$1</em> (<a href=\"http://www.php.net/$1\">manual</A>)"; $haysta ...

you to send a great deal more data and stops people from tampering with your URL to try to find ...

occupation Also for the sake of this tutorial, we use a database server at IP address 10.0.0.1, running M ...

you can query using functions such as getMessage(). The script in Listing 47.6 prints the error message if ...

If you add those two function calls to the end of the script, it is complete. References https://secure.php.net—This ...

BONUS CHAPTER 48 Using Python IN THIS CHAPTER Python on Linux The Basics of Python Functions Object Orientation ...

who has already used Python for more than a few years has learned and the version most likely to have been ...

Center is a Python program. The Python binary is installed in /usr/bin/python (or /usr/bin/python3); if you run tha ...

When you are done, press Ctrl+D to exit. At this point, all your variables and commands are forgotten ...

>>> 2 ** 31 2147483648L The first statement raises 2 to the power of 30 (that is, 2 times 2 ...

type for numbers larger than the normal integer type is designed to handle. More on Strings Python stores a ...

The last line shows how, with commas, you can ask for several indexes at the same time. You could print ...

lower() (lowercases them all), title() (uppercases the first letter in each word), and upper() (uppercases them a ...

negative indexes with strings and slices is a pretty neat feature that deserves a mention. Here’s an ex ...

is where mutability starts to matter, and so this might sound complicated. Recall that an immutable string ...