🔁 Lesson 4: Loops in PHP

Ishika April 17, 2025

Loops in PHP

Loops allow PHP to execute a block of code repeatedly, either a set number of times or until a certain condition is met. They help make your code efficient and reduce repetition.

🧠 Why Use Loops?

Repeat tasks multiple times
Iterate through data like arrays
Reduce code duplication

🔁 1. For Loop

Best when you know how many times you want the loop to run.

for ($i = 1; $i <= 5; $i++) {
  echo "Line $i<br>";
}

Output:

Line 1
Line 2
Line 3
Line 4
Line 5

🔄 2. While Loop

Executes code as long as the condition is true.

$i = 1;
while ($i <= 5) {
  echo "Count: $i<br>";
  $i++;
}

🔁 3. Do...While Loop

This loop runs at least once, even if the condition is false.

$i = 1;
do {
  echo "Number: $i<br>";
  $i++;
} while ($i <= 5);

📦 4. Foreach Loop

Specifically used for iterating over arrays.

$fruits = ["apple", "banana", "orange"];
foreach ($fruits as $fruit) {
  echo "$fruit<br>";
}

Output:

apple
banana
orange

🧾 Summary Table

Loop Type	Use Case	Condition Check Location
for	Known number of repetitions	Before loop starts (top)
while	Unknown repetitions, condition checked first	Top
do...while	Always run once, then check	Bottom
foreach	Loop through arrays	Internally handled