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  • branches/3.5/wp-includes/functions.php

    r23002 r23281  
    903903    $headers = array(
    904904        'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
    905         'Last-Modified' => '',
    906905        'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
    907906        'Pragma' => 'no-cache',
     
    911910        $headers = (array) apply_filters('nocache_headers', $headers);
    912911    }
     912    $headers['Last-Modified'] = false;
    913913    return $headers;
    914914}
     
    925925function nocache_headers() {
    926926    $headers = wp_get_nocache_headers();
     927
     928    unset( $headers['Last-Modified'] );
     929
     930    // In PHP 5.3+, make sure we are not sending a Last-Modified header.
     931    if ( function_exists( 'header_remove' ) ) {
     932        @header_remove( 'Last-Modified' );
     933    } else {
     934        // In PHP 5.2, send an empty Last-Modified header, but only as a
     935        // last resort to override a header already sent. #WP23021
     936        foreach ( headers_list() as $header ) {
     937            if ( 0 === stripos( $header, 'Last-Modified' ) ) {
     938                $headers['Last-Modified'] = '';
     939                break;
     940            }
     941        }
     942    }
     943
    927944    foreach( $headers as $name => $field_value )
    928945        @header("{$name}: {$field_value}");
    929     if ( empty( $headers['Last-Modified'] ) && function_exists( 'header_remove' ) )
    930         @header_remove( 'Last-Modified' );
    931946}
    932947
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