Loops are used to repeat a block of code multiple times until a condition is met.

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🔹 1. for Loop

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

✅ Syntax:

for (initialization; condition; increment/decrement) {
    // code
}

✅ Example:

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

🔍 Output:

1
2
3
4
5

👉 Best for: Counting loops

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🔹 2. while Loop

Runs as long as the condition is true.

✅ Syntax:

while (condition) {
    // code
}

✅ Example:

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

👉 Best for: When number of iterations is unknown

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🔹 3. do-while Loop

Executes the code at least once, even if the condition is false.

✅ Syntax:

do {
    // code
} while (condition);

✅ Example:

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

👉 Key difference:

• while → checks condition first
• do-while → runs first, then checks

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🔹 4. foreach Loop

Used to loop through arrays.

✅ Syntax:

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

✅ Example:

$colors = ["Red", "Green", "Blue"];foreach ($colors as $color) {
    echo $color . "<br>";
}

🔍 Output:

Red
Green
Blue

👉 With key & value:

$student = ["name" => "Aditya", "age" => 22];foreach ($student as $key => $value) {
    echo $key . ": " . $value . "<br>";
}

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🔹 5. break Statement

Used to stop the loop immediately.

✅ Example:

for ($i = 1; $i <= 10; $i++) {
    if ($i == 5) {
        break;
    }
    echo $i . "<br>";
}

🔍 Output:

1 2 3 4

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🔹 6. continue Statement

Skips the current iteration and moves to the next one.

✅ Example:

for ($i = 1; $i <= 5; $i++) {
    if ($i == 3) {
        continue;
    }
    echo $i . "<br>";
}

🔍 Output:

1 2 4 5

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🧠 Quick Summary

Loop Type	Use Case
for	Fixed number of iterations
while	Condition-based looping
do-while	Run at least once
foreach	Arrays
break	Stop loop
continue	Skip iteration