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;
   }
?>

```

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

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;
   }
?>
```

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 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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