str_word_count

//PHP 7.4.6で実行
$str = "Hello world!, I am a Pen! Thank You";

//format を無指定で実行
$result = str_word_count($str);

//結果 単語数が返る
echo $result;
8

//format に 1 を指定
$result = str_word_count($str, 1);

//結果 配列が返る
print_r($result);
Array
(
    [0] => Hello
    [1] => world
    [2] => I
    [3] => am
    [4] => a
    [5] => Pen
    [6] => Thank
    [7] => You
)


//format に 2 を指定
$result = str_word_count($str, 2);

//結果 開始位置をキーとした連想配列が返る
print_r($result);
Array
(
    [0] => Hello
    [6] => world
    [14] => I
    [16] => am
    [19] => a
    [21] => Pen
    [26] => Thank
    [32] => You
)

/* ----------------------------- */

//マルチバイト文字列を指定
$str = "Hello world!!, ありがとう!";

//format に 2 を指定
$result = str_word_count($str, 1);

//結果 通常はマルチバイト文字列は認識しない
print_r($result);
Array
(
    [0] => Hello
    [1] => world
)

//string $charlist で単語として認識できるように指定
$result = str_word_count($str, 1, "ありがとう");

//結果
print_r($result);
Array
(
    [0] => Hello
    [1] => world
    [2] => ありがとう
)

例1 str_word_count() の例
 


$str = "Hello fri3nd, you're
       looking          good today!";

print_r(str_word_count($str, 1));
print_r(str_word_count($str, 2));
print_r(str_word_count($str, 1, 'àáãç3'));

echo str_word_count($str);


 
上の例の出力は以下となります。
 
Array
(
    [0] => Hello
    [1] => fri
    [2] => nd
    [3] => you're
    [4] => looking
    [5] => good
    [6] => today
)

Array
(
    [0] => Hello
    [6] => fri
    [10] => nd
    [14] => you're
    [29] => looking
    [46] => good
    [51] => today
)

Array
(
    [0] => Hello
    [1] => fri3nd
    [2] => you're
    [3] => looking
    [4] => good
    [5] => today
)

7