What are some common pitfalls when extracting small lowercase strings from mixed case strings in PHP arrays?

When extracting small lowercase strings from mixed case strings in PHP arrays, a common pitfall is not taking case sensitivity into account, which can lead to missing desired strings. To solve this issue, you can use the `strtolower()` function to convert both the search term and the array values to lowercase before comparison. 

$array = ['Hello', 'world', 'PHP', 'is', 'awesome'];
$searchTerm = 'php';

$lowercaseArray = array_map('strtolower', $array);
$lowercaseSearchTerm = strtolower($searchTerm);

$matchingStrings = array_filter($lowercaseArray, function($value) use ($lowercaseSearchTerm) {
    return strpos($value, $lowercaseSearchTerm) !== false;
});

print_r($matchingStrings);

Keywords

case-insensitive strtolower array_map strpos substr

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