PHP For Loop

PHP for loop can be used to traverse set of code for the specified number of times.

It should be used if number of iteration is known otherwise use while loop.

Syntax

for(initialization; condition; increment/decrement){  
//code to be executed  
}  

Flowchart

Example

<?php  
for($n=1;$n<=10;$n++){  
echo "$n<br/>";  
}  
?>  

Output:

1

2

3

4

5

6

7

8

9

10

PHP Nested For Loop

We can use for loop inside for loop in PHP, it is known as nested for loop.

In case of inner or nested for loop, nested for loop is executed fully for one outer for loop. If outer for loop is to be executed for 3 times and inner for loop for 3 times, inner for loop will be executed 9 times (3 times for 1st outer loop, 3 times for 2nd outer loop and 3 times for 3rd outer loop).

Example

<?php  
for($i=1;$i<=3;$i++){  
for($j=1;$j<=3;$j++){  
echo "$i   $j<br/>";  
}  
}  
?>

Output:

1 1
1 2
1 3
2 1
2 2
2 3
3 1
3 2
3 3

PHP For Each Loop

PHP for each loop is used to traverse array elements.

Syntax

foreach( $array as $var ){  
 //code to be executed  
}  
?>  

Example

<?php  
$season=array("summer","winter","spring","autumn");  
foreach( $season as $arr ){  
  echo "Season is: $arr<br />";  
}  
?>  

Output:

Season is: summer
Season is: winter
Season is: spring
Season is: autumn