In this tutorial we will study about for loop,probably for loop is the most easy to understand. Examples in this tutorial will make it more clear.

For Control Structure:

In for loop construct there are three parts of For loop, first Initialization part: initialize a variable (we can initialize more than one variable at a time by using comma operator between variables), Condition: to check the validity of the condition, Increment/Decrement: we can increment or decrement the variable(s).

Format of for loop is as below:

for(variable initialization; condition; variable increment/decrement)

statements;

We can use alternative structure also, example is given below:

Example:

<?php

for($i=0;$i<=10;$i++){

echo "<b>Value of i:</b>$i<br/>";

}

echo "<p/>";

$j=10;

for(;$j>0;$j--){

echo "<b>Value of j:</b>$j<br/>";

}

$k=2;

echo "<p/>";

for(;$k<=10;){

echo "<b>Value of k:</b>$k<br/>";

$k+=2;

}

?>

 

Output:

Value of i:0
Value of i:1
Value of i:2
Value of i:3
Value of i:4
Value of i:5
Value of i:6
Value of i:7
Value of i:8
Value of i:9
Value of i:10

Value of j:10
Value of j:9
Value of j:8
Value of j:7
Value of j:6
Value of j:5
Value of j:4
Value of j:3
Value of j:2
Value of j:1

Value of k:2
Value of k:4
Value of k:6
Value of k:8
Value of k:10

Example:

<?php

for($a=1;$a<=10;$a++):

echo $a."&nbsp;";

endfor;

?>

Output:

1 2 3 4 5 6 7 8 9 10 

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