If-else execution flow in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of an if-else statement in PHP?

An if-else statement lets the program choose between two paths based on a condition. If the condition is true, it runs one block of code; if false, it runs another.

beginner

How do you write a simple if-else statement in PHP?

Use if (condition) { ... } else { ... }. The code inside the if block runs if the condition is true; otherwise, the else block runs.

beginner

What happens if the if condition is false and there is no else block?

If the condition is false and no else block exists, PHP skips the if block and continues running the rest of the code.

intermediate

Can you have multiple conditions checked in PHP using if-else?

Yes, you can use elseif to check multiple conditions in order. PHP runs the block for the first true condition it finds.

beginner

Why is if-else important in programming?

If-else lets programs make decisions, like choosing what to do next based on data or user input. It makes programs flexible and interactive.

What will this PHP code output?<br>

<?php
$age = 20;
if ($age >= 18) {
  echo "Adult";
} else {
  echo "Child";
}
?>

A No output

B Child

C Adult

D Error

Since $age is 20, which is greater than or equal to 18, the if block runs and outputs 'Adult'.

What happens if the if condition is false and there is no else block?

A The else block runs

B The if block runs anyway

C The program crashes

D The program skips the if block and continues

Without an else block, if the condition is false, PHP skips the if block and continues running the rest of the code.

Which keyword lets you check multiple conditions in PHP?

A elseif

B else if

C switch

D case

The 'elseif' keyword lets you check multiple conditions in sequence inside if-else statements.

What is the correct syntax for an if-else statement in PHP?

A if (condition) { ... } else { ... }

B if condition then ... else ...

C if (condition) then { ... } else { ... }

D if condition { ... } else { ... }

PHP requires parentheses around the condition and curly braces for code blocks: if (condition) { ... } else { ... }

Why do programmers use if-else statements?

A To repeat code multiple times

B To make decisions based on conditions

C To store data

D To define functions

If-else statements let programs choose different actions depending on conditions, enabling decision-making.

Explain how an if-else statement controls the flow of a PHP program.

Think about how the program chooses which code to run.

Describe the difference between if, else if, and else in PHP.

Consider how multiple choices are handled.