Loops execute a block of code
a specified number of times, or while a specified condition is true.
The for Loop
The
for loop is used when you know in advance how many times the script should run.
Syntax
for (init;
condition; increment)
{
code to be executed;
}
Parameters:{
code to be executed;
}
- init: Mostly used
to set a counter (but can be any code to be executed once at the beginning
of the loop)
- condition: Evaluated for
each loop iteration. If it evaluates to TRUE, the loop continues. If it
evaluates to FALSE, the loop ends.
- increment: Mostly used
to increment a counter (but can be any code to be executed at the end of
the iteration)
Example
The
example below defines a loop that starts with i=1. The loop will continue to
run as long as i is less than, or equal to 5. i will increase by 1 each time
the loop runs:
<html>
<body>
<?php
for ($i=1; $i<=5; $i++)
{
echo "The number is " . $i . "<br />";
}
?>
</body>
</html>
Output:<body>
<?php
for ($i=1; $i<=5; $i++)
{
echo "The number is " . $i . "<br />";
}
?>
</body>
</html>
The number is 1
The number is 2
The number is 3
The number is 4
The number is 5
The number is 2
The number is 3
The number is 4
The number is 5
The foreach Loop
The
foreach loop is used to loop through arrays.
Syntax
foreach ($array as $value)
{
code to be executed;
}
For
every loop iteration, the value of the current array element is assigned to
$value (and the array pointer is moved by one) - so on the next loop iteration,
you'll be looking at the next array value.{
code to be executed;
}
Example
The
following example demonstrates a loop that will print the values of the given
array:
<html>
<body>
<?php
$x=array("one","two","three");
foreach ($x as $value)
{
echo $value . "<br />";
}
?>
</body>
</html>
Output:<body>
<?php
$x=array("one","two","three");
foreach ($x as $value)
{
echo $value . "<br />";
}
?>
</body>
</html>
one
two
three
two
three
