For
Loops
The for loop is used when you know in advance how many
times the script should run.
The for
loop is simply a while loop with a bit more code added to it. The common tasks
that are covered by a for loop are:
1.
Set
a counter variable to some initial value.
2.
Check
to see if the conditional statement is true.
3.
Execute
the code within the loop.
4.
Increment
a counter at the end of each iteration through the loop.
Syntax:
For (init; condition; increment)
{
code to be executed;
}
Example:
<html>
<body>
<?php
for ($i=1; $i<=5; $i++)
{
echo "The number is " . $i . "<br>";
}
?>
</body>
</html>
Output:
The number is 1
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.
Imagine that you have an associative array that you
want to iterate through. PHP provides an easy way to use every element of an
array with the For each statement.
We have an associative array that stores the names of
people in our company as the keys with the values being their age.
We want to know how old everyone is at work so we use a
Foreach loop to print out everyone's name and age.
PHP Code:
$employeeAges;
$employeeAges["Lisa"]
= "28";
$employeeAges["Jack"]
= "16";
$employeeAges["Ryan"]
= "35";
$employeeAges["Rachel"]
= "46";
$employeeAges["Grace"]
= "34";
foreach( $employeeAges as
$key => $value){
echo "Name: $key, Age: $value <br />";
}
Display:
Name: Lisa, Age: 28
Name: Jack, Age: 16
Name: Ryan, Age: 35
Name: Rachel, Age: 46
Name: Grace, Age: 34
Example:
<html>
<body>
<?php
$x=array("one","two","three");
foreach ($x as $value)
{
echo $value . "<br>";
}
?>
</body>
</html>
Output:
one
two
three
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