PHP 5 in Practice

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PHP was originally created by Rasmus Lerdorf in It was initially known as Personal Home Page.

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The current major version of PHP is 7. All of the code in this tutorial has been tested and validated against the most recent release of PHP 7. PHP is very powerful language yet easy to learn and use. So bookmark this website and continued on. Tip: Our PHP tutorial will help you to learn the fundamentals of the PHP scripting language, from the basic to advanced topics step-by-step.

PHP - Wikipedia

If you're a beginner, start with the basics and gradually move forward by learning a little bit every day. The list does not end here, there are many other interesting things that you can do with PHP. You will learn about all of them in detail in upcoming chapters. If you're familiar with other server-side languages like ASP. There are several advantages why one should choose PHP.

This PHP tutorial series covers all the fundamental programming concepts, including data types, operators, creating and using variables, generating outputs, structuring your code to make decisions in your programs or to loop over the same block of code multiple times, creating and manipulating strings and arrays, defining and calling functions, and so on.

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Once you're comfortable with the basics, you'll move on to next level that explains the concept file system, sessions and cookies, dates and times, as well as how to send email from your script, handling and validating forms, perform data filtration and handling errors in PHP. Finally, you'll explore some advanced concepts like classes and objects, parsing JSON data, pattern matching with regular expressions, exception handling as well as how to use PHP to manipulate data in MySQL database and create useful features like user login system, Ajax search, etc.

In a shared-hosting environment, its configuration might restrict what you can do. You might find that some of these solutions work on different or older versions of PHP. Many common hashing algorithms like md5 and even sha1 are unsafe for storing passwords, because hackers can easily crack passwords hashed using those algorithms.

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PHP provides a built-in password hashing library that uses the bcrypt algorithm, currently considered the best algorithm for password hashing. PDO has a consistent interface across many different types of database, uses an object-oriented approach, and supports more features offered by newer databases.

PDO makes all that gunk unnecessary.

Learn PHP in 15 minutes

Double-quoted strings are parsed and any PHP variables in the string are evaluated. For extremely high-load apps, it might matter a little. Make a choice depending on what your app needs, but whatever you choose, be consistent. Traditionally in PHP you would define constants using the define function. But at some point PHP gained the ability to also declare constants with the const keyword. Which one should you use when defining your constants?

Using const generally results in more readable code, but at the expense of flexibility.

In older versions of PHP, every time a script was executed it would have to be compiled from scratch, even if it had been compiled before. Opcode caches were additional software that saved previously compiled versions of PHP, speeding things up a bit.

What Exactly is Good PHP Performance?

There were various flavors of caches you could choose from. Lucky for us, the version of PHP that ships with Ubuntu Memcached is a popular choice and it works with many languages, including PHP. However, when it comes to accessing a Memcached server from a PHP script, you have two different and very stupidly named choices of client library: Memcache and Memcached. It turns out that the Memcache d library is the one that best implements the Memcached protocol.

After you install the Memcached server, you need to install the Memcached client library.

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You can install the Memcached client library on Ubuntu Before Ubuntu Since the version of PHP that ships since Ubuntu Each family of functions used a slightly different flavor of regular expression. There are several ways of configuring a web server to serve PHP. Both of these keep a limited number of PHP processes running, and Apache sends requests to these interfaces to handle PHP execution on its behalf.

Because these libraries limit how many PHP processes are alive, memory usage is greatly reduced without affecting performance. This was the standard solution for web servers since Ubuntu In the years since Ubuntu The following example is for Apache 2.

Execute PHP Online

PHP provides a mail function that looks enticingly simple and easy. Unfortunately, like a lot of things in PHP, its simplicity is deceptive and using it at face value can lead to serious security problems. Email is a set of protocols with an even more tortured history than PHP.

PHPMailer is a popular and well-aged open-source library that provides an easy interface for sending mail securely. It takes care of the gotchas for you so you can concentrate on more important things. A common task your web app might need to do is to check if a user has entered a valid email address. A malicious user can craft HTML that, if outputted directly by your web app, can be dangerous to the person viewing it.

While it may be tempting to use regular expressions to sanitize HTML, do not do this.

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