What are common causes of the "Warning: Invalid argument supplied for foreach()" error in PHP scripts?

The "Warning: Invalid argument supplied for foreach()" error in PHP scripts typically occurs when trying to iterate over a variable that is not an array or an object implementing the Traversable interface. To solve this issue, you should check if the variable is iterable before using it in a foreach loop. This can be done using the is_array() or is_iterable() functions to ensure that the variable is suitable for iteration. 

if (is_iterable($variable)) {
    foreach ($variable as $item) {
        // Your code here
    }
} else {
    // Handle the case when $variable is not iterable
}

Keywords

PHP foreach Invalid argument error troubleshooting

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