PHP Embedded JavaScript Highlighting

Adds JavaScript syntax highlighting to quoted function values in PHP arrays. It recognises the JavaScript content rather than framework methods or specific array keys.

The extension is declarative. It injects VS Code's built-in JavaScript TextMate grammar into recognised PHP strings and does not run any extension code.

Example

$options = [
    'onReady' => 'function () {
        const element = document.querySelector(".example");

        return element !== null;
    }',
    'transform' => 'function (value) { return String(value); }',
];

Both single-quoted and double-quoted PHP values are supported, including values that begin on the same line as another array element. Single-quoted PHP strings are recommended for JavaScript containing template literals because PHP will not attempt to interpolate JavaScript ${...} expressions.

Scope

Any quoted PHP array value beginning with function or async function is treated as JavaScript. Other PHP strings, including ordinary labels and HTML, are left unchanged.

As this is lexical syntax highlighting, JavaScript stored in a PHP variable or assembled through concatenation cannot be followed automatically:

$callback = 'function () { return this.id; }';

['onReady' => $callback];