Foreach loop for arrays in PHP - Step-by-Step Execution

Concept Flow - Foreach loop for arrays

Start with array

↓

Pick first element

↓

Execute loop body with element

↓

More elements?

Yes→Pick next element

No +---> Back to Execute loop body↓

End loop

↩No +---> Back to Execute loop body

The foreach loop picks each element from the array one by one and runs the loop body using that element until all elements are processed.

Execution Sample

PHP

<?php
$fruits = ["apple", "banana", "cherry"];
foreach ($fruits as $fruit) {
    echo $fruit . "\n";
}
?>

This code loops through each fruit in the array and prints its name on a new line.

Execution Table

Iteration	Current Element ($fruit)	Action	Output
1	"apple"	Print $fruit	apple
2	"banana"	Print $fruit	banana
3	"cherry"	Print $fruit	cherry
-	-	No more elements, exit loop	-

💡 All elements processed, foreach loop ends

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
$fruit	undefined	"apple"	"banana"	"cherry"	"cherry" (holds last value)

Key Moments - 3 Insights

Why does $fruit change each iteration?

Because foreach assigns the current array element to $fruit at each iteration, as shown in execution_table rows 1 to 3.

What happens after the last element is processed?

The loop stops and $fruit holds the value of the last element ("cherry"), as shown in the variable_tracker final value.

Can foreach modify the original array elements?

Not in this example because $fruit is a copy of each element. To modify, you need to use references (not shown here).

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of $fruit during iteration 2?

A "apple"

B "banana"

C "cherry"

D undefined

💡 Hint

Check the 'Current Element ($fruit)' column at iteration 2 in the execution_table.

At which iteration does the foreach loop stop?

A After iteration 1

B After iteration 2

C After iteration 3

D It never stops

💡 Hint

Look at the exit note and the last iteration row in the execution_table.

If the array had 5 elements, how many times would the loop body run?

A 5 times

B 3 times

C 4 times

D Depends on the element values

💡 Hint

Each element in the array causes one loop iteration, as shown in the concept_flow and execution_table.

Concept Snapshot

foreach ($array as $value) {
    // code using $value
}

- Loops over each element in $array
- $value holds current element
- Runs loop body once per element
- Stops after last element
- Simple way to read arrays

Full Transcript

The foreach loop in PHP goes through each element of an array one by one. It assigns the current element to a variable, here called $fruit, and runs the code inside the loop using that variable. This continues until all elements have been used. In the example, the loop prints each fruit name on its own line. After the last element, the loop ends and the variable holds the value of the last element. This is a simple way to read all items in an array without needing to manage indexes manually.