PHP Variables

Variables store information.

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Syntax

$name = "Aayan";

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Rules

1. Must start with $
2. Cannot start with number.
3. Case-sensitive.

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Valid

$playerName
$serverName
$pluginVersion

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Invalid

$1name
$player-name

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Data Storage

$name = "Steve";
$health = 20;

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Dynamic Variables

$var = "name";

$$var = "Aayan";

echo $name;

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Variable Variables

Advanced feature allowing variables to contain variable names.

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Scope Example

$name = "Aayan";

function test() {

}

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PocketMine Example

$onlinePlayers =
count(
    $this->getServer()
        ->getOnlinePlayers()
);

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Best Practices

Use:

$playerHealth
$serverVersion

Avoid:

$a
$b
$x

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Exercise

Create:

$name
$age
$server
$onlinePlayers