PHP Scalar Data Types

PHP scalar types include bool, int, float and string for ordinary values.

What It Does

PHP scalar types include bool, int, float and string for ordinary values. The following examples distinguish a normal use case, a boundary case and a practical application.

Requirements and Compatibility

PHP 8.x and a local test environment. Apply input validation, correct error handling and the requirements of any optional libraries.

The code focuses on the core concept. Production implementation may also need routes, validation, persistence, authorization or deployment tooling.

Example 1: Basic Behavior

Start with the smallest meaningful working case.

<?php
function total(int $quantity, float $price): float { return $quantity * $price; }
echo total(3, 4.5);

Example 2: Another Case

Examine the edge case and the observable result.

<?php
function findName(int $id): ?string { return $id === 5 ? 'Rita' : null; }
var_dump(findName(8));

Practical Example: Putting It to Use

Show the four scalar types without confusing them with arrays or objects.

<?php
$fields = ['active' => true, 'visits' => 5, 'rating' => 4.5, 'name' => 'Mina'];
foreach ($fields as $key => $value) echo $key . ':' . get_debug_type($value) . '; ';

Important Behavior and Edge Cases

Untrusted HTTP input arrives mostly as strings; validate and convert it explicitly.

Comparison with Related Functions or Approaches

Common Beginner Mistakes

Key Takeaways

• PHP scalar types include bool, int, float and string for ordinary values.
• Untrusted HTTP input arrives mostly as strings; validate and convert it explicitly.
• Value objects can express stronger domain-specific constraints.

Before adapting these examples, verify the return values, test the failure paths and confirm that your application meets its security and environment requirements.