Description:
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From manual page: http://www.php.net/function.pg-query-params
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After testing pg_query_params, I found that it supports reusing parameters. In other words, the script below works as expected (no error message). This was IMO not clear from the documentation.

Test script:
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pg_query_params(
    'SELECT * FROM tname WHERE foo = $1 OR bar = $1',
    array('value'));