Avoid our pre-flight writable checks if get_core_checksums() doesn't exist yet.
Thus, it will not work for 3.6 => 3.7, only 3.7+. see #22704. Built from https://develop.svn.wordpress.org/trunk@25798 git-svn-id: http://core.svn.wordpress.org/trunk@25710 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -710,7 +710,7 @@ function update_core($from, $to) {
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}
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// If we're using the direct method, we can predict write failures that are due to permissions.
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if ( $wp_filesystem->method === 'direct' ) {
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if ( $check_is_writable && 'direct' === $wp_filesystem->method ) {
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$files_writable = array_filter( $check_is_writable, array( $wp_filesystem, 'is_writable' ) );
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if ( $files_writable !== $check_is_writable ) {
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$files_not_writable = array_diff_key( $check_is_writable, $files_writable );
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