✅ Conditional Statements in PHP
Conditional statements allow your program to make decisions based on conditions — like “if a user is logged in, show their profile; otherwise, show the login form.”
1. if Statement
Executes a block of code only if the condition is true.
2. if...else Statement
Executes one block of code if the condition is true, another if it’s false.
3. if...elseif...else Chain
Checks multiple conditions in sequence.
4. Ternary Operator (Shorthand if...else)
Useful for simple conditions in a single line.
5. switch Statement
Good for checking one variable against multiple values.
Best Practices
-
Always use braces
{}for clarity, even for one-line blocks. -
Use
===instead of==for strict comparison (type + value). -
Sanitize user input before using it in conditions (e.g.,
htmlspecialchars()).
Summary Table
| Type | Use Case |
|---|---|
if |
Run code if a condition is true |
if...else |
Run one of two code blocks |
if...elseif...else |
Handle multiple options |
?: (ternary) |
Shorthand for simple if...else |
switch |
Compare one value against many cases |
