Скачать или смотреть PHP & MySQLi for Web Development - Loop & its Type - Part 10

Loops in PHP
Loops are fundamental control structures in PHP that allow a block of code to be executed repeatedly based on a condition. They help in automating repetitive tasks and reduce redundancy in code.

Types of Loops in PHP
1. While Loop
Executes a block of code as long as the specified condition evaluates to true.
Useful when the number of iterations is not predetermined.
Key Features:

The condition is evaluated before executing the loop.
If the condition is initially false, the loop will not execute.
2. Do-While Loop
Similar to the while loop but guarantees the code block runs at least once.
The condition is checked after the execution of the loop.
Key Features:

Ensures at least one iteration.
Ideal for scenarios where the condition depends on code executed within the loop.
3. For Loop
Ideal for scenarios where the number of iterations is known.
Combines initialization, condition-checking, and increment/decrement in a single line.
Key Features:

Clean and concise.
Commonly used for iterating through a sequence of numbers or items.
4. Foreach Loop
Specifically designed for iterating over arrays.
Loops through each element in an array and assigns it to a variable for use within the loop.
Key Features:

Easy to use with arrays and objects.
Automatically handles array indices.
When to Use Which Loop?
Type of Loop Use Case
While When the number of iterations is unknown and depends on a condition.
Do-While When you need the loop to execute at least once before checking the condition.
For When the number of iterations is predetermined.
Foreach When iterating over an array or collection of items.
Common Use Cases
While Loop: Continuously check user input until it meets specific criteria.
Do-While Loop: Ensure a menu displays at least once before allowing user input.
For Loop: Generate tables, lists, or repetitive calculations.
Foreach Loop: Process and display data from arrays or databases.
Mastering PHP loops allows you to handle repetitive tasks efficiently, making your code cleaner and more dynamic.