'../build/pdf.js?v=' . $version . '"', '../build/pdf.js"' => '../build/pdf.js?v=' . $version . '"', // Viewer script (Mozilla provides as .mjs, we mirror to .js) 'viewer.mjs"' => 'viewer.js?v=' . $version . '"', 'viewer.js"' => 'viewer.js?v=' . $version . '"', // Viewer stylesheet 'viewer.css"' => 'viewer.css?v=' . $version . '"', // Localization 'locale/locale.json"' => 'locale/locale.json?v=' . $version . '"', // Worker scripts (referenced in viewer.js) '../build/pdf.worker.mjs' => '../build/pdf.worker.js?v=' . $version, '../build/pdf.worker.js' => '../build/pdf.worker.js?v=' . $version, // Sandbox script (referenced in PDF library) '../build/pdf.sandbox.mjs' => '../build/pdf.sandbox.js?v=' . $version, '../build/pdf.sandbox.js' => '../build/pdf.sandbox.js?v=' . $version, ); $customization_script = << // Override Worker constructor to add version query parameter const OriginalWorker = window.Worker; window.Worker = class extends OriginalWorker { constructor(scriptURL, options) { // Add version to pdf.worker.js requests let modifiedURL = scriptURL; if (typeof scriptURL === 'string' && scriptURL.includes('pdf.worker.js') && !scriptURL.includes('?')) { modifiedURL = scriptURL + '?v=$version'; } super(modifiedURL, options); } }; // Preserve static properties Object.keys(OriginalWorker).forEach(key => { window.Worker[key] = OriginalWorker[key]; }); HTML; header( 'Content-Type: text/html; charset=utf-8' ); echo str_replace( '', $customization_script . '', strtr( $html, $replacements ) );