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@ 2018-09-08T10:19:52Z

<?php
$interesting_words = [
  'test' => [
    'number_of_occurances' => 0,
    'connected_words' => [
        'TEST',
        'TESTER',
        'TESTING'
      ]
    ],
  'foobar' => [
    'number_of_occurances' => 0,
    'connected_words' => [
        'FOO',
        'FOOBAR',
        'BAR'
      ]
    ]
];
$str = 'Lorem ipsum TEST sit amet, consectetur TESTER elit. Sed in turpis dui. Maecenas venenatis FOOBAR facilisis. Quisque dictum, diam consequat mollis TESTING, orci tellus aliquet nisl, BAR molestie FOO augue at est. In TESTING vehicula lectus. Curabitur ac varius ligula. Pellentesque orci urdna.';
$str = preg_replace('/[\.\,]/i','',$str);
$str = strtolower($str);
$str_arr = explode(" ",$str);
$str_occurance_counts = array_count_values($str_arr);
foreach($interesting_words as $k=>&$v){
  foreach($v['connected_words'] as $c=>$cVal){
    $v['number_of_occurances'] += $str_occurance_counts[strtolower($cVal)];
  }
  echo "Number of occurances for '$k': ".$v['number_of_occurances']."\n";
}
print_r($interesting_words );
?>

Output for git.master, git.master_jit, rfc.property-hooks: Number of occurances for 'test': 4 Number of occurances for 'foobar': 3 Array ( [test] => Array ( [number_of_occurances] => 4 [connected_words] => Array ( [0] => TEST [1] => TESTER [2] => TESTING ) ) [foobar] => Array ( [number_of_occurances] => 3 [connected_words] => Array ( [0] => FOO [1] => FOOBAR [2] => BAR ) ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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