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Fix GH-1178: array_flip allegedly can return null
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@@ -48,7 +48,7 @@
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns the flipped array on success and &null; on failure.
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Returns the flipped array.
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</para>
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</refsect1>
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