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

Recall & Review

beginner

What does an if statement do in PHP?

An if statement checks a condition. If the condition is true, it runs the code inside its block. If false, it skips that code.

beginner

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

The code inside the if block is skipped, and the program continues with the next statement after the if block.

beginner

How does an else block work with an if statement?

The else block runs only when the if condition is false. It provides an alternative set of instructions.

intermediate

What is the role of elseif in PHP's if statement execution flow?

elseif lets you check multiple conditions one after another. It runs the block for the first true condition it finds.

intermediate

Explain the execution flow of this PHP code:<br>

if ($a > 10) { echo 'Big'; } elseif ($a > 5) { echo 'Medium'; } else { echo 'Small'; }

PHP checks if $a is greater than 10. If yes, it prints 'Big'. If not, it checks if $a is greater than 5. If yes, it prints 'Medium'. Otherwise, it prints 'Small'. Only one block runs.

What happens if the if condition is true?

A The code inside the <code>if</code> block runs.

B The code inside the <code>else</code> block runs.

C The program stops.

D Nothing happens.

When the if condition is true, PHP runs the code inside the if block.

Which block runs if the if condition is false and there is an else block?

A <code>else</code> block

B No block runs

C <code>elseif</code> block

D <code>if</code> block

If the if condition is false, the else block runs if it exists.

What does elseif allow you to do?

A Run code only if the first <code>if</code> is true

B Run code after the <code>else</code> block

C Skip all conditions

D Check multiple conditions one after another

elseif lets you check more than one condition in order.

In this code, what will print if $a = 7?<br>

if ($a > 10) { echo 'Big'; } elseif ($a > 5) { echo 'Medium'; } else { echo 'Small'; }

A Big

B Medium

C Small

D Nothing

7 is not greater than 10, but it is greater than 5, so 'Medium' prints.

If none of the if or elseif conditions are true, what happens?

A The <code>if</code> block runs anyway

B The program crashes

C The <code>else</code> block runs if it exists

D Nothing runs

The else block runs when all previous conditions are false.

Describe how PHP decides which block of code to run in an if-elseif-else statement.

Think about the order PHP checks conditions and what happens when one is true.

Explain what happens when an if statement has no else block and the condition is false.

Consider what PHP does when it finds no code to run inside the if.