WHAT IS A LOOP
loop is used to repeat the specific block of code again and again ,until the given condition is true.
types of loops:
for loop:
syntax:
for(initialization;condition;increment/decrement)
{
#block of code
}
note:
increment :add a value by one.
decrement: subtract a value by one.
example: print a sequence of numbers from 1 to 5 .
for($a=1;$a<=5;$a++)
{
echo$a,"<br>";
}
output:
1
2
3
4
5
example:
print the 7 div elements (div) using for loop (remember:div will be written only one time
in a box).
<html>
<head>
<style>
</style>
</head>
<body>
<div class="main">
<?php
for($a=1;$a<=7;$a++)
{
?>
<div>
<p>this para in for loop</p>
<img src="a.jpg">
</div>
<?php
}
?>
</div>
</body>
</html>
while loop:
The while loop runs the specific block of code until the spcified condition is true .
syntax:
while(condition)
{
#block of code
#increment or decrement
}
example:
$a=1;
while($a<2)
{
echo$a;
$a++;
}
do-while loop:
The do-while loop is used to run a set of code of the program several times . If you have to execute the loop at least once ,then you can use do-while loop .
syntax:
do
{
#block of code
}while(condition);
example:
Q1. write a program to execute a loop atleast once, even the condition is false.
$i=1;
do
{
echo $i,"<br>";
$i++;
}
while($i<2);
foreach loop:
The foreach loop is generally used for the arrays and is used to loop through each key/value pair in an array.<?php
foreach($emp as $key => $val) {
echo $key," = ",$val,"<br>";
}
<?php
foreach($emp as $row)
}
?>
0 Comments