What are some common errors that occur when using array_filter() in PHP?

One common error when using array_filter() in PHP is forgetting to pass the array as the first argument. This can result in unexpected behavior or errors. To fix this, always make sure to pass the array as the first argument when using array_filter(). 

// Incorrect usage of array_filter()
$filteredArray = array_filter(function($value) {
    return $value > 5;
});

// Corrected code
$array = [3, 6, 9, 12];
$filteredArray = array_filter($array, function($value) {
    return $value > 5;
});

Keywords

array_filter PHP errors callback function filtering

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