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>yaz_ccl_parse</H1
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><P
> (PHP 4 >= 4.0.5)</P
>yaz_ccl_parse -- Invoke CCL Parser</DIV
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><H2
>Description</H2
>int <B
CLASS="methodname"
>yaz_ccl_parse</B
> ( resource id, string query, array & result)<BR
></BR
><P
> This function invokes a CCL parser. It converts a given
CCL FIND query to an RPN query which may be passed to the
<A
HREF="function.yaz-search.html"
><B
CLASS="function"
>yaz_search()</B
></A
> function to perform a search.
To define a set of valid CCL fields call
<A
HREF="function.yaz-ccl-conf.html"
><B
CLASS="function"
>yaz_ccl_conf()</B
></A
> prior to this function.
If the supplied <TT
CLASS="parameter"
><I
>query</I
></TT
> was successfully
converted to RPN, this function returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
>, and the index
<TT
CLASS="literal"
>rpn</TT
> of the supplied array
<TT
CLASS="parameter"
><I
>result</I
></TT
> holds a valid RPN query.
If the query could not be converted (because of invalid syntax,
unknown field, etc.) this function returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> and three
indexes are set in the resulting array to indicate the cause
of failure: <TT
CLASS="literal"
>errorcode</TT
>CCL error code (integer),
<TT
CLASS="literal"
>errorstring</TT
>CCL error string, and
<TT
CLASS="literal"
>errorpos</TT
>approximate position in query of failure
(integer is character position).
</P
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>Ejemplo 1. CCL Parsing</B
></P
><P
>We'll try to search using CCL. In the example below,
<TT
CLASS="literal"
>$ccl</TT
> is a CCL query.
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>yaz_ccl_conf($id,$fields); // see example for yaz_ccl_conf
if (!yaz_ccl_parse($id, $ccl, &$cclresult) {
echo 'Error: ' . $cclresult["errorstring"];
} else {
$rpn = $cclresult["rpn"];
yaz_search($id,"rpn",$rpn);
}</PRE
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