sprintf(): Too few arguments... why??

you have % in one of the variables!

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example：

$Consulta = sprintf ("UPDATE info_table SET title = '%s, alt = '%s', abstract = '%s', WHERE ref = '%s';", $title, $alt, $abstract, $ref);???? //error

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$Consulta = sprintf ("UPDATE info_table SET title = '%s', alt = '%s', abstract = '%s', WHERE ref = '%s';", $title, $alt, $abstract, $ref);???? //right

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