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PHP Basic Loops

PHP For & foreach looping

For loop in PHP is used to iterate through a section in an application. This is used frequently in many scripts where a common block of code to be executed repeatedly. We can add break statement to stop the loop in between based on matching requirements.
We will start with a basic loop and then move to adding different requirements to it. Here is the basic syntax for for loop.
for($i=1; $i<=10; $i++){
echo $i."<br>";
}
This will list from number one to ten. In above case the loop is executed 10 times and each time the value of $i is increased by 1. So in the first loop the value of $i became 1 and in the last loop the value equals to 10. Next time when the value of $i becomes 11 the condition checking fails and the loop is escaped without executing. Here condition is checked at the staring of the loop.

Now we will try with a break statement in side the for loop. By using break we can exit the loop without completing the total required loopings (early exit).
for($i=1; $i<=10; $i++){
if($i > 5){break;}
echo $i."<br>";
}
This will list from 1 to 5 only. The If condition inside the for loop will exit the loop when the value of $i exceeds 5 ( that is when it equals to 6)

Demo of for loop

Step value of increment in loop

So far we have seen each time the variable value is increased by 1. This increase or step value can be changed. Now we will use a step value of 10 so the variable $i will increase its value by 10 ( it was increasing by 1 in previous cases ) in each looping.
for($i=0;$i<=100;$i +=10){
echo $i."<br>";
}
The above code will display 0,10,20 ... till 100

While handling PHP Arrays foreach function is required to display the elements of an array. Once the foreach function is called the array pointer will reset to the first element of the array. So we need not call the reset() again( Reset() rewinds array’s internal pointer to the first element. ). Here is an example of the foreach code.
$i = array (10, 12, 13, 25);
foreach ($i as $v) {
print "Present  value of \$i: $v <br> ";
}
This will list all the values of the array from starting to end. You can read more on arrays
Read how to display elements of an array

Nested for loops

One for loop can be kept inside another for loop and we can generate different scripts using nested loops. Here is an example.
for($i=1; $i<=10; $i++){
	for($j=1;$j<=$i;$j++){
		echo "*";
	}
echo "<br>";
}
You can check more on this on For loop demo page

Number of User Comments : 1


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vinit03-05-2013
How to use loop in the form of next if i am click on browser?
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