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<?php $big = ['html', 'body', 'div', 'body','table', 'tbody', 'tr', 'td']; $small = ['body', 'div', 'td']; $wrong = ['td', 'body', 'div']; function isSubsequence($haystack,$needle){ if(count($needle) > count($haystack)) return false; $keys = array_keys($needle); $ptr = 0; $len = count($needle); foreach($haystack as $element){ if($ptr === $len) return true; if($needle[$keys[$ptr]] === $element) $ptr++; } return $ptr === $len; } var_dump(isSubsequence($big, $small)); var_dump(isSubsequence($big, $wrong));
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
bool(true) bool(false)

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