Using ${var} in strings is deprecated in PHP

What the message means

Using ${var} in strings is deprecatedA deprecation is an early warning that a feature still works today but will be removed in a future PHP version, so code using it must be changed in time. concerns inserting a variable into a text string. This notation has been deprecated since PHPPHP is a programming language that builds your web pages on the computer that hosts your site, just before they reach the visitor. WordPress runs on it. 8.2. For an ordinary variable, {$var} is an alternative.

This is different from the removed curly-brace syntax for accessing an individual character or array element.

Before changing anything

Keep the complete error line and its timestamp in a private note. Record the action that failed, the active PHP versionA PHP version is a numbered edition of PHP, like 8.3. Each edition is looked after for a limited time, then gets security fixes only, then nothing. and the components updated at the same time. Share only information needed for the investigation.

Public support forums are not an appropriate place for customer details, credentials or complete server paths.

Back up files and the database before making changes. Check that the backupA backup is a separate copy of your website's files and database, so you can bring the site back after a mistake, a hack or a failed update. is usable. Work on a private test copy with the same PHP version and relevant settings.

Disable real payments and outgoing customer email there. Agree who will make the change and who will check the outcome. The steps below are investigation advice rather than a diagnosis of your particular website.

Possible cause

Locate the reported text template. Establish whether it uses an ordinary variable or an expression selecting another variable name. The PHP manual distinguishes these cases.

A blanket replacement can therefore change the intended text. Check email templates and generated labels in a preview without sending real messages.

Fix it in five steps

1. Keep the message and identify the affected template. Record which visible text it generates, such as a subject line or order label.
2. Have the developer distinguish an ordinary variable from a variable variable name. Write down the expected text using recognisable test values.
3. Apply a targeted syntax change following the string documentation. Keep separate checks for the content and the destination where it will be displayed.
4. Generate the text on the test copy with supplied and missing optional data. Compare punctuation, spaces and characters immediately beside each inserted variable.
5. Inspect the complete example in a mail capture or preview. Review fresh logs and record the templates actually changed and tested.

A concrete acceptance test

An order confirmation containing a first name and order reference makes a useful proposed test. Check both values in the intended positions, including a case without an optional company name. Direct test mail into a private capture.

Compare its subject and body separately. This is a suggested investigation, not a finding about your shop templates. Quiet logs are insufficient if the finished message uses the wrong customer field or displays variable names literally.

Record the expected wording before comparing it.

Identify who maintains the code

For a pluginA WordPress plugin is an add-on you install in WordPress to give your site extra features, such as contact forms, SEO tools or a webshop. or themeA WordPress theme is a ready-made package that decides how your WordPress site looks and how its pages are laid out. Change the theme and the design changes., first ask which release fits the intended PHP environment. Give its maintainer the error line and the action that reproduces it. Request a focused change with an explanation of the expected result.

The same explanation belongs in a handover to the developer of custom code.

Avoid changing unrelated components during the same investigation. Keep the original message separate from any new messages after an adjustment. Record the code version and test inputs for each attempt.

This lets you associate a result with a specific change. A test where nobody knows which files changed cannot provide useful acceptance evidence.

Agree in advance what would make the test fail. Examples include incorrect content, lost settings or a visitor action that can no longer be completed. Making a warning disappear is only part of the check.

Ask the website owner to assess the result that a visitor actually needs, alongside the technical review of the change.

When to get help

Use the existing PHP update service or the help form below if you cannot access the code or do not maintain the affected library. Describe the failed action and intended outcome. Do not send passwords.

Ask which correction is proposed and which test will establish that it works.

Use the Exposure Check through the Check your PHP version link as an initial version check. A public check cannot always determine the PHP version and does not prove the cause or repair of this error. If the result is unknown, ask the host to confirm the active version for this website.

After repair, keep versions, test results and fresh log entries with your maintenance notes. Let the responsible administrator decide when the tested change can reach the live website.

Record which fields were populated in the example. Ask whoever maintains customer copy to read the preview. This checks that the message remains understandable and all intended details appear in the right order, alongside the technical syntax review.