The Break Statement in PHP

Let's say we have a loop that outputs array elements to the screen:

<?php
	$arr = [1, 2, 3, 4, 5];
	
	foreach ($arr as $elem) {
		echo $elem;
	}
?>

Suppose our task is to determine if the array contains the number 3. If it does, - we will output '+++' to the screen (and if it doesn't - we will do nothing).

Let's solve our task:

<?php
	$arr = [1, 2, 3, 4, 5];
	
	foreach ($arr as $elem) {
		if ($elem == 3) {
			echo '+++';
		}
	}
?>

The task is solved, however, there is a problem: after the number 3 has been found, the array still continues to be pointlessly iterated further, wasting valuable CPU resources and slowing down our script.

It would be more optimal to terminate our loop immediately after finding the number. This can be done using a special break statement, which allows for premature termination of the loop.

So, let's terminate the loop as soon as we encounter the number 3:

<?php
	$arr = [1, 2, 3, 4, 5];
	
	foreach ($arr as $elem) {
		if ($elem == 3) {
			echo '+++';
			break; // exit the loop
		}
	}
?>

The break statement can terminate any loops: foreach, for, while.

Given an array with numbers. Start a loop that will output the elements of this array to the console one by one until an element with the value 0 is encountered. After that, the loop should terminate.

Given an array with numbers. Find the sum of the elements from the beginning of the array to the first negative number.

Given an array with numbers. Find the position of the first number 3 in this array (assuming that this number is definitely in the array).

Determine how many integers, starting from the number 1, need to be added so that the sum becomes greater than 100.