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Check whether serialized data is of string type.
<code style="color: #000000"><span style="color: #0000BB"><?php is_serialized_string</span><span style="color: #007700">( </span><span style="color: #0000BB">$data </span><span style="color: #007700">) </span><span style="color: #0000BB">?></span></code>
Since: 2.0.5
is_serialized_string() is located in wp-includes/functions.php.