PHP で全角半角を考慮して文字列を同じ長さに切りそろえる / Cut the character string to the same length in PHP considering full-width and half-width characters.

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<?php

/**
 * 文字列を同じ長さに切りそろえる
 * 文字列 $s を半角=1, 全角=2 として $narrowLength で区切って配列で返す
 */
function mb_strwidth_split($s, $narrowLength) {
    $result = [];
    while (strlen($s)) {
        $lead = mb_strimwidth($s, 0, $narrowLength);
        $s = mb_substr($s, mb_strlen($lead));
        array_push($result, $lead);
    }
    return $result;
}

$s = 'あい0123うえおかきくけこさしすせそたちつてとなにぬねのはひふへほまみむめもやゆよらりるれろわゐゑ123をん';
print_r(mb_strwidth_split($s, 21));
/*
$ php -version
PHP 7.4.3 (cli) (built: Nov 25 2021 23:16:22) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies

$ php mb_strwidth_split.php
Array
(
    [0] => あい0123うえおかきく
    [1] => けこさしすせそたちつ
    [2] => てとなにぬねのはひふ
    [3] => へほまみむめもやゆよ
    [4] => らりるれろわゐゑ123を
    [5] => ん
)
*/

<?php

/**

* 文字列を同じ長さに切りそろえる

* 文字列 $s を半角=1, 全角=2 として $narrowLength で区切って配列で返す

function mb_strwidth_split($s, $narrowLength) {

$result = [];

while (strlen($s)) {

$lead = mb_strimwidth($s, 0, $narrowLength);

$s = mb_substr($s, mb_strlen($lead));

array_push($result, $lead);

}

return $result;

}

$s = 'あい0123うえおかきくけこさしすせそたちつてとなにぬねのはひふへほまみむめもやゆよらりるれろわゐゑ123をん';

print_r(mb_strwidth_split($s, 21));

$ php -version

PHP 7.4.3 (cli) (built: Nov 25 2021 23:16:22) ( NTS )

Zend Engine v3.4.0, Copyright (c) Zend Technologies

with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies

$ php mb_strwidth_split.php

Array

(

[0] => あい0123うえおかきく

[1] => けこさしすせそたちつ

[2] => てとなにぬねのはひふ

[3] => へほまみむめもやゆよ

[4] => らりるれろわゐゑ123を

[5] => ん

)

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