PHP if statement

In this tutorial I will show you how to use the if statement in PHP.

Step 1 - Control structures

PHP if statement

Control structures are the fundamental elements of PHP (and any other programming language). These structures allows you to controll the program / script flow. In PHP there are more control structures and we can split them into 2 categories.

Conditional statements
Iteration statements

In this description I will focus only on the if statement which is maybe the most important conditional statement.

You can use the if statement if you want to execute a set of code when a condition is true. It is very similar as in C. The syntax is the following:

if (condition) code to execute in case the condition is true;

Let's see a real example.

Code: 

  if ($userName == 'Peter') echo 'Hello Peter!';
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Notice that we used == in the condition and not =. This means that we want to check the equality og the left and right values and we don't want to assign a new value to the variable.

In this example there was only a one line statement to be executed if the condition is true. Of course you can use a complete code block. In this case you have to put all relevant code in a code block separated by { and } as follows:

Code: 

  if ($userName == 'Peter') {
     echo 'Hello Peter!';    
     echo 'Nice to see you again!'; 
  }
 
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Next Step of PHP if statement

Tags: php if statement, if statement, if, php

PHP if statement - Table of contents
Step 1 - Control structures
Step 2 - More complex if statement

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PHP if statement

Step 1 - Control structures