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PHP Manual

Basic knowledge

Basic knowledge

Almost all programming languages consist of keywords, which are special expressions of the language that have a special meaning. An example of a keyword is the word string, if or echo. It is important to note that keywords (sometimes also commands) a…

Cycles and their types in PHP

Loops in general are used to repeat the same code section (usually over a data set) For each type of task, a different type of loop is suitable, which differs mainly in meaning and syntax. It is also important to note that all types of loops are conv…

How to understand PHP code

Most languages can be written in different ways, with the same result. At the same time, once you have written the code, you will probably read it sometime in the future and correct it or add new features. Therefore, to avoid having to think about th…

Echo - output to source code

The echo construct is used to dump a variable or string into the source code. Support: All versions Brief description: Output one or more strings Type: command, construct (not a function) Description echo 'hello world'; Print "hello world". $var = 't…

Escaping characters in a string in PHP

Escaping is used to write characters that have different meanings in different contexts. For example, we want to insert another quotation mark into a string enclosed by quotation marks. How to do it? There are 2 options: echo "Levi's jeans"; // Combi…

Conditions in PHP - IF() {...} - branching options

Note: This article may be a bit messy for some beginners as it assumes a basic understanding of PHP. If you're interested in how conditions work, read about conditions in the beginner's course. Support: All versions: PHP 4, PHP 5, PHP 7 Brief descrip…

Commands, keywords and functions in PHP

Every PHP script consists of commands and functions, together these are called constructs. When the script is processed, these language expressions are tracked (this process is called tokenization) and based on the keywords the interpreter decides ho…

PHP function date(), date and time

The date() function is a tool for working with date and time. It is used in two cases: Finding the current state, i.e. the current date, time, … and outputting it in a specific format, Converting a specific date into another format (for example, mont…

Overview of web development knowledge

Knowing how to create a website and then take comprehensive care of it is not just a matter of making it. There are many hurdles along the way and it's good to have at least a basic idea of each thing. When I started out, I didn't really know what al…

Conditions and branching

Warning: This article was written many years ago and some information may be outdated or incorrect. Please bear this in mind when reading. No more linear programs! The most basic principle of any program is "what happens when….". A condition can be w…

Special meaning of quotation marks

In PHP, you can often replace quotation marks with apostrophes and achieve the same effect. Sometimes we even use a combination of quotes and apostrophes on purpose to achieve different output without having to use escaping. TLDR: Using quotes can be…

print - String output Description print 'Hello World!'; print(), is not really a real function (it's a language construct), so you don't need to use parentheses. Parameters arg Output parameter Return values Always returns the number 1. Note Note: Be…

Basic developer concepts

This is a very brief list of basic concepts that every beginning developer should know. I use them all across articles. For programmers Program - an independently running task for a computer. Script - a series of instructions that are executed by an…

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