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<?php $content = '<table></table><p></p><table></table><p></p><table></table><p></p>'; $counter = 0; echo preg_replace_callback('~<table\K>~', function() use (&$counter) { return ' class="table_' . $counter++ . '">'; }, $content);

This is an error 500

Value for `_results` contains invalid data `array`


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