Check whether a given string is an anagram of another given string.

/** * Check if a word is an anagram of another word * Break Down the Problem: * a. Checking length of two given strings - return false if it doesn't match the length * b. Mapping characters between two strings - Checking same char in two strings * c. Counting for each character found - Same char, but checking occurrence is same between two strings * d. Comparing each character count between two strings - if char and char count are same * * @param string $str1 * @param string $str2 * @return false|string */ function checkAnagram(string $str1, string $str2) { $msg = ''; try { $str1Count = strlen($str1); $str2Count = strlen($str2); if ($str1Count !== $str2Count) { return false; } $strOne = $strTwo = []; for ($i = 0; $i < $str1Count; $i++) { if (isset($strOne[$str1[$i]])) { $strOne[$str1[$i]]++; } else { $strOne[$str1[$i]] = 1; } if (isset($strTwo[$str2[$i]])) { $strTwo[$str2[$i]]++; } else { $strTwo[$str2[$i]] = 1; } } foreach ($strOne as $char => $count) { if (! isset($strTwo[$char]) || $count !== $strTwo[$char]) { throw new Exception("This word {$str1} is not anagram of {$str2}."); } else { $msg = "This word {$str1} is anagram of {$str2}."; } } } catch (Exception $ex) { $msg = $ex->getMessage(); } return $msg; } /** * It doesn't match, why? * a. String length is same for given two string * b. Char are same in two strings * c. But count of char occurrence isn't same- 'c' two times in str1, and 'c' one time in str2 * d. For matching: Just try 'act' with the word 'cat' */ print_r(checkAnagram('acct', 'caat'));