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<?php $haystack = 'abcdefghi'; $needle = 'acegi'; function charsExistInString($haystack, $needle) { $haystackChars = count_chars($haystack); $needleChars = str_split($needle); foreach ($needleChars as $c) { if ($haystackChars[ord($c)] == 0) { return false; } } return true; } var_dump(charsExistInString($haystack, 'acegi')); var_dump(charsExistInString($haystack, 'acez'));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false)

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