If a certain condition is met, the **if** statement causes some code to run.

```php
<?php
   if (condition) {
     code to be executed if condition is true;
   }
?>
```

University of Michigan - Ann Arbor

When writing code, it's very common to want to take multiple actions depending on the situation. To accomplish this, you can utilize conditional statements in your code.

The following conditional statements are available in PHP:

- If a condition is true, the if statement performs some code; if it is false.
- if...else statement executes some code; and if it is true.
- if...elseif...else statement executes multiple codes for more than two circumstances.
- Switch statements are used to choose which of numerous code blocks to execute.

```php
<?php
   $t = date("H");

   if ($t < "20") {
     echo "Welcome to 1cademy.com!";
   }
?>
```

PHP Conditional Statements

php.net

PHP - The if Statement

If a condition is true, the **if...else** expression executes one piece of code; if it's false, it executes another.

```php
<?php
   if (condition) {
     code to be executed if condition is true;
   } else {
     code to be executed if condition is false;
   }
?>
```

PHP - The if...else Statement

To run one statement under various conditions, use the **Switch** statement in PHP. Similar to PHP's if-else-if statement, it operates.


```php
<?php
switch (n) {
  case label1:
    code to be executed if n=label1;
    break;
  case label2:
    code to be executed if n=label2;
    break;
  case label3:
    code to be executed if n=label3;
    break;
    ...
  default:
    code to be executed if n is different from all labels;
}
?>
```

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