wp_get_script_polyfill( WP_Scripts $scripts, array $tests )
Returns contents of an inline script used in appending polyfill scripts for browsers which fail the provided tests. The provided array is a mapping from a condition to verify feature support to its polyfill script handle.
Description Description
Parameters Parameters
- $scripts
-
(WP_Scripts) (Required) WP_Scripts object.
- $tests
-
(array) (Required) Features to detect.
Return Return
(string) Conditional polyfill inline script.
Source Source
File: wp-includes/script-loader.php
function wp_get_script_polyfill( &$scripts, $tests ) {
$polyfill = '';
foreach ( $tests as $test => $handle ) {
if ( ! array_key_exists( $handle, $scripts->registered ) ) {
continue;
}
$src = $scripts->registered[ $handle ]->src;
$ver = $scripts->registered[ $handle ]->ver;
if ( ! preg_match( '|^(https?:)?//|', $src ) && ! ( $scripts->content_url && 0 === strpos( $src, $scripts->content_url ) ) ) {
$src = $scripts->base_url . $src;
}
if ( ! empty( $ver ) ) {
$src = add_query_arg( 'ver', $ver, $src );
}
/** This filter is documented in wp-includes/class.wp-scripts.php */
$src = esc_url( apply_filters( 'script_loader_src', $src, $handle ) );
if ( ! $src ) {
continue;
}
$polyfill .= (
// Test presence of feature...
'( ' . $test . ' ) || ' .
// ...appending polyfill on any failures. Cautious viewers may balk
// at the `document.write`. Its caveat of synchronous mid-stream
// blocking write is exactly the behavior we need though.
'document.write( \'<script src="' .
$src .
'"></scr\' + \'ipt>\' );'
);
}
return $polyfill;
}
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Changelog Changelog
| Version | Description |
|---|---|
| 5.0.0 | Introduced. |