PHP Loop Types
Loops in PHP are used to execute the same block of code a specified number of times. PHP supports following four loop types.
-
for − loops through a block of code a specified number of times.
-
while − loops through a block of code if and as long as a specified condition is true.
-
do...while − loops through a block of code once, and then repeats the loop as long as a special condition is true.
-
foreach − loops through a block of code for each element in an array.
We will discuss about continue and break keywords used to control the loops execution.
For loop
<?php
for ($x = 0; $x <= 10; $x++) {
echo $x.',';
}
?>
output: 0,1,2,3,4,5,6,7,8,9,10,
Explain
$x = 0; - Initialize the loop counter ($x), and set the start value to 0
$x <= 10; - Continue the loop as long as $x is less than or equal to 10
$x++ - Increase the loop counter value by 1 for each iteration
While Loop
The while loop executes a block of code as long as the specified condition is true.
<?php
$x = 1;
while($x <= 5) {
echo 'The number is:'. $x ;
$x++;
}
?>
Output:
The number is: 1
The number is: 2
The number is: 3
The number is: 4
The number is: 5
Explained
$x = 1; - Initialize the loop counter ($x), and set the start value to 1
$x <= 5 - Continue the loop as long as $x is less than or equal to 5
$x++; - Increase the loop counter value by 1 for each iteration
Do While Loop
The do...while loop will always execute the block of code once, it will then check the condition, and repeat the loop while the specified condition is true.
<?php
$x = 1;
do {
echo 'The number is:'. $x ;
$x++;
} while ($x <= 5);
?>
Output:
The number is: 1
The number is: 2
The number is: 3
The number is: 4
The number is: 5
Explained: This is similar to while loop but this loop will execute at least one, because the condition check at last
Foreach loop
<?php
$colors = array("red", "green", "blue", "yellow");
foreach ($colors as $value) {
echo $value;
}
?>
Output:
red
green
blue
yellow
Explained:
This is simplest loop in php use to display array or object easily.
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