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Mit diesem Seiten-Bestseller lernen Sie die Programmiersprache PHP und das Datenbanksystem MySQL von Grund auf kennen, um eigene moderne. PHP Offline Tutorial App is a PHP Learning App From Basics to Advanced Level of PHP, PHP Reference and PHP Study Guide for Students And Developers. Zum Angebot PHP: A Beginner's Guide This task-oriented reference teaches you everything you need to know to build cutting-edge Web applications with PHP.
You have probably all heard the term expression used in mathematics. We use expressions in PHP to preform operations and give an answer to a single value.
These expressions are made up of two parts, the operators and the operands. The operands can be variables, numbers, strings, boolean values, or other expressions.
In this expression the operands are a, 3 and 4. Now that you understand what an operand is we can go into more detail about what operators are.
Operators tell us what to do with operands, and they fall into three major categories:. Mathematical operators are exactly what they are called, they apply mathematical functions to the operands.
Comparison is also pretty straight forward, they compare one operand to another operand. Boolean however may need a little more explaining.
Boolean is an extremely simple form of logic. In Boolean every statement is either True or False. Think of a light switch, it must either be turned on or off, there is no in between.
Let me give you an example:. Again this is a TRUE expression. Since that is the case, this expression is TRUE. Conditionals allow your program to make choices.
Following the same sort of boolean logic you just learned about, the computer can only make two choices; true or false.
Below is an example of an IF statement that would apply a senior's discount. When using just the IF statement the code within the brackets either will true or will not false be executed before carrying on with the rest of the program.
When we add in the ELSE statement, if the statement is true it will execute the first set of code and if it is false it will execute the second ELSE set of code.
One useful thing to remember about conditional statements is that they can be nested within each other.
There are other ways of doing this - such as using elseif or switch but this demonstrates how statements can be nested. This program will first check if they are eligible for the senior's discount.
If they are not, it will then check if they are eligible for a student discount, before returning the non-discounted price. Share Flipboard Email.
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PHP stands for Hypertext Preprocessor. PHP is a very popular and widely-used open source server-side scripting language to write dynamically generated web pages.
PHP was originally created by Rasmus Lerdorf in It was initially known as Personal Home Page. 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.
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.
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