How to decompose a string into characters in php

First type:

$arr = str_split($str);
p($arr);

Result:

Summary:

The str_split method is used directly to split, but unfortunately this method does not support Chinese parsing. Here you can consider the split of mb_split, and why here [sample] Will the two characters be divided into six garbled characters? It should be caused by utf8. One Chinese character in utf8 occupies 3 bytes, and one Chinese character in GBK and GB2312 occupies 2 bytes.

Second type:

$arr = preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);
P($arr);

Result:

Summary:

Regular rules are used here to separate characters

preg_split(pattern, subject, limit, flags)

pattern: Pattern used for search, string form;

subject: Input string;

limit: how many characters are limited, -1|0|null means no limit

flags: PREG_SPLIT_NO_EMPTY (returns the separated non-empty part [commonly used]) PREG_SPLIT_DELIM_CAPTURE( Parenthesized expressions in delimited patterns will be captured and returned) PREG_SPLIT_OFFSET_CAPTURE (with the string offset appended to the return for each occurrence of a match).

Third type:

$len = mb_strlen($str, 'utf8');
$tmp = [];
for ($i = 0;$i < $len;$i++) {
    $tmp[] = $str[$i];
}
p($tmp);

Result:

Result:

Use a loop to cut the string, first get the length of the string, and then for loop, the last unknown character here is because $len = 7, so the cycle is 7 times, which is different from the utf8 character confusion problem of the first method.

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