PhpHow-ToBeginner · 3 min read

How to Use If Else in PHP: Simple Guide with Examples

In PHP, you use if to run code when a condition is true, and else to run code when it is false. The syntax is if (condition) { ... } else { ... }. This lets your program choose between two paths based on conditions.

📐

Syntax

The if else statement in PHP lets you run different code blocks based on a condition. The if part checks if a condition is true. If it is, the code inside its block runs. If not, the else block runs instead.

Here is the basic structure:

php

<?php
if (condition) {
    // code runs if condition is true
} else {
    // code runs if condition is false
}
?>

💻

Example

This example checks if a number is positive or not. It prints a message based on the check.

php

<?php
$number = 5;
if ($number > 0) {
    echo "The number is positive.";
} else {
    echo "The number is zero or negative.";
}
?>

Output

The number is positive.

⚠️

Common Pitfalls

Common mistakes include missing parentheses around the condition, forgetting curly braces, or using = instead of == for comparison.

Always use == or === to compare values, not = which assigns values.

php

<?php
// Wrong: assignment instead of comparison
$age = 20;
if ($age == 18) {
    echo "You are 18.";
} else {
    echo "You are not 18.";
}

// Right: comparison
if ($age === 18) {
    echo "You are 18.";
} else {
    echo "You are not 18.";
}
?>

Output

You are not 18.

📊

Quick Reference

Part	Description
if (condition)	Checks if the condition is true
{ ... }	Code block that runs if condition is true
else	Runs if the condition is false
{ ... }	Code block that runs if condition is false

✅

Key Takeaways

Use if else to run code based on true or false conditions.

Always put conditions inside parentheses and code inside curly braces.

Use == or === for comparisons, not = which assigns values.

The else block runs only if the if condition is false.

Missing braces or parentheses cause syntax errors.