PHP for loop tutorial

In this tutorial I will show you with a lot of code example how to use the for loop in PHP.

Tutorial info:

Name:	PHP for loop tutorial
Total steps:	2
Category:	Basics
Level:	Beginner

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Step 1 - For loop basics

PHP for loop tutorial

The for loop is the most used and the most complex loop. However it's usage is not so complicated. The definition of the for statement looks like this:

for (expr1; expr2; expr3) statement

As you can see with 3 expressions it is really more complex than a while loop.

What does these expressions means? Let's discuss it one-by-one.

expr1: This expression is called only once and this is the first statement which is executed during the loop lifetime. In general loop variable initialization used to be here.
expr2: This condition is checked in each iteration. If it is true then the statement will be executed.
expr3: As final step of each iteration this code will be executed.

Let's see a real example how it looks like:

Code: 
for ($i=0;$i<10;$i++) echo "$i<br/>";
PHP F1

As you can see here we first initialised the $i variable with 0. Afterwards we defined a condition which is true until the value of $i is less than 10. As last step we increment the value of the variable to avoid endless loop. As result the echo statement will be executed 10 times printing out its actual value.

As usual you can use code blocks instead of only one statement. However in case of only one statement I recommend to use code blocks between {} as it can eliminate some further problem.

Code: 
for ($i=0;$i<10;$i++) {
   echo "$i<br/>";
   echo "-------<br/>";
}
 
PHP F1

Of course you can change the value of the loop variable inside the loop, but be careful with this solution.

Code: 
for ($i=0;$i<10;$i++) {
   echo "$i<br/>";
   echo "-------<br/>";
   $i++;
}
PHP F1

Next Step of PHP for loop tutorial

Tags: php for loop, for loop, php for, php, for, loop

PHP for loop tutorial - Table of contents
Step 1 - For loop basics
Step 2 - Break and continue the for loop

PHP for loop tutorial

Tutorial info:

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Step 1 - For loop basics

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