How can a search form in PHP be properly constructed to avoid errors like "Invalid argument supplied for foreach()"?

The "Invalid argument supplied for foreach()" error occurs when trying to iterate over a variable that is not an array. To avoid this error, you should check if the variable is an array before using it in a foreach loop. This can be done using the is_array() function to ensure that the variable is indeed an array before attempting to iterate over it. 

if(is_array($search_results)) {
    foreach($search_results as $result) {
        // Process each search result
    }
} else {
    // Handle case where $search_results is not an array
}

Keywords

PHP search form foreach error handling validation

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