Description:
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This sample code is a customized version of the sample from http://php.net/pg_execute

Reproduce code:
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$dbconn = pg_connect(...)

// Prepare a query for execution
$result = pg_prepare($dbconn, "my_query", 'SELECT $1');

// Execute the prepared query.  Note that it is not necessary to escape
// the string "Joe's Widgets" in any way
$result = pg_execute($dbconn, "my_query", array("Joe's Widgets"));

// Execute the same prepared query, this time with a different parameter
$result = pg_execute($dbconn, "my_query", array("Clothes Clothes Clothes"));

Expected result:
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No errors ;)

Actual result:
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Warning: pg_prepare(): Query failed: ERROR:  could not determine data type of parameter $1 in ...
Warning: pg_execute(): Query failed: ERROR:  prepared statement "my_query" does not exist in ...
Warning: pg_execute(): Query failed: ERROR:  prepared statement "my_query" does not exist in ...