Check if Any Array Value Contains a Specific Substring

<?php

/**
 * Checks if any string value in an array contains a specific substring.
 *
 * @param array $array The array to search within.
 * @param string $substring The substring to search for.
 * @param bool $caseSensitive Whether the search should be case-sensitive (default: false).
 * @return bool True if at least one value contains the substring, false otherwise.
 */
function arrayContainsSubstring(array $array, string $substring, bool $caseSensitive = false): bool
{
    foreach ($array as $value) {
        // Ensure value is a string before searching
        if (is_string($value)) {
            if ($caseSensitive) {
                if (str_contains($value, $substring)) { // PHP 8+
                    return true;
                }
            } else {
                if (str_contains(strtolower($value), strtolower($substring))) { // PHP 8+
                    return true;
                }
            }
            /* For PHP 7.x compatibility, use strpos:
            if ($caseSensitive) {
                if (strpos($value, $substring) !== false) {
                    return true;
                }
            } else {
                if (strpos(strtolower($value), strtolower($substring)) !== false) {
                    return true;
                }
            }
            */
        }
    }
    return false;
}

$keywords = ['php', 'JavaScript', 'Python', 'HTML', 'CSS'];

// Case-insensitive search
$hasScript = arrayContainsSubstring($keywords, 'script');
echo "Does 'keywords' contain 'script' (case-insensitive)? " . ($hasScript ? 'Yes' : 'No') . "
"; // Yes

$hasPhp = arrayContainsSubstring($keywords, 'PHP', true);
echo "Does 'keywords' contain 'PHP' (case-sensitive)? " . ($hasPhp ? 'Yes' : 'No') . "
"; // Yes

$hasRuby = arrayContainsSubstring($keywords, 'Ruby');
echo "Does 'keywords' contain 'Ruby'? " . ($hasRuby ? 'Yes' : 'No') . "
"; // No

$mixedArray = ['apple', 123, 'banana', ['nested'], 'orange pie'];
$hasOrange = arrayContainsSubstring($mixedArray, 'orange');
echo "Does 'mixedArray' contain 'orange'? " . ($hasOrange ? 'Yes' : 'No') . "
"; // Yes