Warning: strlen() expects parameter 1

Question

Im constantly seeing the following error in system.log I've gone into the file but cant see anything wrong can any one help me?

Warning: strlen() expects parameter 1 to be string, array given in /app/code/core/Mage/Catalog/Model/Layer/Filter/Attribute.php on line 93

Answer 1

This is from my copy (1.7.0.2) of app/code/core/Mage/Catalog/Model/Layer/Filter/Attribute.php

_getOptionText is returning an array, not a string like the code is clearly expecting. I'd see what class getFrontend is returning and then see how that can be returning an array.

protected function _getOptionText($optionId)
{
    return $this->getAttributeModel()->getFrontend()->getOption($optionId);
}

/**
 * Apply attribute option filter to product collection
 *
 * @param   Zend_Controller_Request_Abstract $request
 * @param   Varien_Object $filterBlock
 * @return  Mage_Catalog_Model_Layer_Filter_Attribute
 */
public function apply(Zend_Controller_Request_Abstract $request, $filterBlock)
{
    $filter = $request->getParam($this->_requestVar);
    if (is_array($filter)) {
        return $this;
    }
    $text = $this->_getOptionText($filter);
    if ($filter && strlen($text)) {
        $this->_getResource()->applyFilterToCollection($this, $filter);
        $this->getLayer()->getState()->addFilter($this->_createItem($text, $filter));
        $this->_items = array();
    }
    return $this;
}

Answer 2

strlen() is a function which gives the length of the string you passed as a parameter.

The error is that you must be passing an array in the strlen(). Please check the value you are passing. It should be string.

Check your file "Attribute.php" at line no. 93.