97 lines
3.1 KiB
YAML
97 lines
3.1 KiB
YAML
uuid:
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- value: d421a5a4-8025-4809-8a30-68c723e46af6
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langcode:
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- value: en
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type:
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- target_id: daily_email
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target_type: node_type
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target_uuid: 8bde1f2f-eef9-4f2d-ae9c-96921f8193d7
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revision_timestamp:
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- value: '2025-05-11T09:00:44+00:00'
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revision_uid:
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- target_type: user
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target_uuid: b8966985-d4b2-42a7-a319-2e94ccfbb849
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revision_log: { }
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status:
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- value: true
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uid:
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- target_type: user
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target_uuid: b8966985-d4b2-42a7-a319-2e94ccfbb849
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title:
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- value: |
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Immutable read-only properties in PHP 8.1
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created:
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- value: '2023-04-13T00:00:00+00:00'
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changed:
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- value: '2025-05-11T09:00:44+00:00'
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promote:
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- value: false
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sticky:
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- value: false
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default_langcode:
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- value: true
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revision_translation_affected:
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- value: true
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path:
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- alias: /daily/2023/04/13/immutable-read-only-properties-in-php-8-1
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langcode: en
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body:
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- value: |
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<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>
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<pre><code class="language-php">class AccountDetails {
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public function __construct(
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public readonly string $accountNumber,
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public readonly string $sortCode,
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) {}
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}
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</code></pre>
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<p>This means the public properties can be read and used without the need for getter methods, but cannot be overridden - making the DTO immutable.</p>
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<p>Without <code>readonly</code>, a DTO can be created and the property values can be changed:</p>
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<pre><code class="language-php">$accountDetails = new AccountDetails('12345678', '00-00-00');
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$accountDetails->accountNumber = 'banana';
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</code></pre>
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<p>With <code>readonly</code> set, you'd get a fatal error instead:</p>
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<blockquote>
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<p>Fatal error: Uncaught Error: Cannot modify readonly property AccountDetails::$accountNumber in /home/opdavies/tmp/example.php:13</p>
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</blockquote>
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format: full_html
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processed: |
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<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>
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<pre><code class="language-php">class AccountDetails {
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public function __construct(
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public readonly string $accountNumber,
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public readonly string $sortCode,
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) {}
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}
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</code></pre>
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<p>This means the public properties can be read and used without the need for getter methods, but cannot be overridden - making the DTO immutable.</p>
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<p>Without <code>readonly</code>, a DTO can be created and the property values can be changed:</p>
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<pre><code class="language-php">$accountDetails = new AccountDetails('12345678', '00-00-00');
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$accountDetails->accountNumber = 'banana';
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</code></pre>
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<p>With <code>readonly</code> set, you'd get a fatal error instead:</p>
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<blockquote>
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<p>Fatal error: Uncaught Error: Cannot modify readonly property AccountDetails::$accountNumber in /home/opdavies/tmp/example.php:13</p>
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</blockquote>
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summary: null
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field_daily_email_cta: { }
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