Nikita Popov 93ba3abe63 Warn on strtr(["" => "x"]) ...

Previously:
 * If only ["" => "x"] was present, the original string was returned
   without warning.
 * If both ["" => "x"] and at least one more element was present,
   false was returned without warning.

New behavior:
 * Ignore "" keys in the replacement array (and perform any remaining
   replacement).
 * Throw a warning indicating that an empty string replacement has
   been ignored.

Closes GH-4792.

2019-10-30 10:53:45 +01:00

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