When you know ahead of time how many times the script should run, you use the for loop.

```php
<?php
   for (init counter; test counter; increment counter) {
     code to be executed for each iteration;
   }
?>
```

University of Michigan - Ann Arbor

When writing code, you frequently want a particular block of code to run a given number of times repeatedly. Thus, we can use loops in a script rather than adding numerous nearly identical code lines.

Loops are used to repeatedly run the same block of code as long as a specific condition is met.

We have the following sorts of loops in PHP:

- while - loops through a block of code as long as the specified condition is true
- do...while - loops through a block of code once, and then repeats the loop as long as the specified condition is true
- for - loops through a block of code a specified number of times
- foreach - loops through a block of code for each element in an array

PHP Loops

php.net

The PHP for Loop

While the provided condition is true, the while loop runs a block of code.

```php
<?php
   while (condition is true) {
     code to be executed;
   }
?>
```

The PHP while Loop

The foreach loop iterates through each key/value pair in an array and is only compatible with arrays.

```php
<?php
   foreach ($array as $value) {
     code to be executed;
   }
?>

```

The PHP foreach Loop

The do...while loop always runs the supplied block of code once, checks the condition, and then repeats the loop as long as the condition is true.

```php
<?php
   do {
     code to be executed;
   } while (condition is true);
?>
```

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