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<?php $sentences = [ 0 => 'The tiger is the national animal of India', 1 => 'The tiger is a large carnivorous mammal that roams the forests', 2 => 'The tiger feeds on animals that also live in the forest', 3 => 'The tiger does have a coat of orange with black stripes', 4 => 'Tigers, regardless of their subspecies, are carnivorous animals', 5 => 'The tiger is a protected species', ]; foreach ($sentences as $sentence) { $letters = preg_match_all ('~[a-z\d]~', strtolower($sentence), $out) ? $out [0] : []; $occurrences = array_count_values($letters); arsort($occurrences); $result[] = [ "sentence" => $sentence, "character" => key($occurrences), "occurrences" => current($occurrences) ]; } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'sentence' => 'The tiger is the national animal of India', 'character' => 'i', 'occurrences' => 6, ), 1 => array ( 'sentence' => 'The tiger is a large carnivorous mammal that roams the forests', 'character' => 'a', 'occurrences' => 7, ), 2 => array ( 'sentence' => 'The tiger feeds on animals that also live in the forest', 'character' => 'e', 'occurrences' => 7, ), 3 => array ( 'sentence' => 'The tiger does have a coat of orange with black stripes', 'character' => 'e', 'occurrences' => 6, ), 4 => array ( 'sentence' => 'Tigers, regardless of their subspecies, are carnivorous animals', 'character' => 's', 'occurrences' => 8, ), 5 => array ( 'sentence' => 'The tiger is a protected species', 'character' => 'e', 'occurrences' => 6, ), )

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