oliverdavies.uk/content/node.d421a5a4-8025-4809-8a30-68c723e46af6.json

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    "title": [
        {
            "value": "Immutable read-only properties in PHP 8.1\n"
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            "value": "2023-04-13T00:00:00+00:00"
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    "body": [
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            "value": "\n          <p>Continuing with yesterday's data transfer object (DTO) example, something that can be done since PHP 8.1 is to make properties read-only:<\/p>\n\n<pre><code class=\"language-php\">class AccountDetails {\n\n  public function __construct(\n  public readonly string $accountNumber,\n  public readonly string $sortCode,\n  ) {}\n\n}\n<\/code><\/pre>\n\n<p>This means the public properties can be read and used without the need for getter methods, but cannot be overridden - making the DTO immutable.<\/p>\n\n<p>Without <code>readonly<\/code>, a DTO can be created and the property values can be changed:<\/p>\n\n<pre><code class=\"language-php\">$accountDetails = new AccountDetails('12345678', '00-00-00');\n$accountDetails-&gt;accountNumber = 'banana';\n<\/code><\/pre>\n\n<p>With <code>readonly<\/code> set, you'd get a fatal error instead:<\/p>\n\n<blockquote>\n  <p>Fatal error: Uncaught Error: Cannot modify readonly property AccountDetails::$accountNumber in \/home\/opdavies\/tmp\/example.php:13<\/p>\n<\/blockquote>\n\n        ",
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            "processed": "\n          <p>Continuing with yesterday's data transfer object (DTO) example, something that can be done since PHP 8.1 is to make properties read-only:<\/p>\n\n<pre><code class=\"language-php\">class AccountDetails {\n\n  public function __construct(\n  public readonly string $accountNumber,\n  public readonly string $sortCode,\n  ) {}\n\n}\n<\/code><\/pre>\n\n<p>This means the public properties can be read and used without the need for getter methods, but cannot be overridden - making the DTO immutable.<\/p>\n\n<p>Without <code>readonly<\/code>, a DTO can be created and the property values can be changed:<\/p>\n\n<pre><code class=\"language-php\">$accountDetails = new AccountDetails('12345678', '00-00-00');\n$accountDetails-&gt;accountNumber = 'banana';\n<\/code><\/pre>\n\n<p>With <code>readonly<\/code> set, you'd get a fatal error instead:<\/p>\n\n<blockquote>\n  <p>Fatal error: Uncaught Error: Cannot modify readonly property AccountDetails::$accountNumber in \/home\/opdavies\/tmp\/example.php:13<\/p>\n<\/blockquote>\n\n        ",
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