Edit Report a Bug

    str_split

    (PHP 5, PHP 7)

    str_split — 문자열을 배열로 변환

    설명

    array str_split ( string $string [, int $split_length ] )

    문자열을 배열로 변환합니다.

    인수

    string

    입력 문자열.

    split_length

    조각의 최대 길이.

    반환값

    선택적인 split_length 인수를 지정하면, 반환하는 배열은 split_length 길이의 원소로 나누어집니다. 지정하지 않으면 하나의 원소에 한 문자가 들어갑니다.

    split_length가 1보다 작을 경우에는 FALSE를 반환합니다. split_length 길이가 string의 길이보다 클 경우, 문자열 전체를 첫번째 배열 원소로 반환합니다.

    예제

    Example #1 str_split() 용례

    <?php

    $str     = "Hello Friend";

    $arr1 = str_split($str);
    $arr2 = str_split($str, 3);

    print_r($arr1);
    print_r($arr2);

    ?>

    위 예제의 출력:

    Array
(
    [0] => H
    [1] => e
    [2] => l
    [3] => l
    [4] => o
    [5] =>
    [6] => F
    [7] => r
    [8] => i
    [9] => e
    [10] => n
    [11] => d
)

Array
(
    [0] => Hel
    [1] => lo 
    [2] => Fri
    [3] => end
)

    참고

    • chuck_split()
    • preg_split() - 정규 표현식에 따라 문자열을 나눔
    • explode() - 문자열을 문자열로 나눕니다
    • count_chars() - 문자열 안에 사용한 문자에 대한 정보를 반환
    • str_word_count() - 문자열에서 사용한 단어에 대한 정보를 반환
    • for

    add a note add a note

    User Contributed Notes 3 notes

    up
    0
    Julian
    1 year ago
    The function str_split() is not 'aware' of words. Here is an adaptation of str_split() that is 'word-aware'.

    <?php

    $array     =  str_split_word_aware(
            'In the beginning God created the heaven and the earth. And the earth was without form, and void; and darkness was upon the face of the deep.',
            32
    );

    var_dump($array);

    /**
      * This function is similar to str_split() but this function keeps words intact; it never splits through a word.
      *
      * @return array<int, string>
      */
    function str_split_word_aware(string $string, int $maxLengthOfLine): array
    {
        if (    $maxLengthOfLine <= 0) {
            throw new     RuntimeException(sprintf('The function %s() must have a max length of line at least greater than one', __FUNCTION__));
        }
       
            $lines = [];
            $words = explode(' ', $string);

            $currentLine = '';
            $lineAccumulator = '';
        foreach (    $words as $currentWord) {

                $currentWordWithSpace = sprintf('%s ', $currentWord);
                $lineAccumulator .= $currentWordWithSpace;
            if (    strlen($lineAccumulator) < $maxLengthOfLine) {
                    $currentLine = $lineAccumulator;
                continue;
            }

                $lines[] = $currentLine;

                // Overwrite the current line and accumulator with the current word
                $currentLine = $currentWordWithSpace;
                $lineAccumulator = $currentWordWithSpace;
        }

        if (    $currentLine !== '') {
                $lines[] = $currentLine;
        }

        return     $lines;
    }

    ?>

    OUTPUT:

    <?php

    array(5) {
      [    0]=> string(29) "In the beginning God created "
          [1]=> string(30) "the heaven and the earth. And "
          [2]=> string(28) "the earth was without form, "
          [3]=> string(27) "and void; and darkness was "
          [4]=> string(27) "upon the face of the deep. "
    }

    ?>
    up
    -7
    lskatz at gmail dot com
    16 years ago
    A good use of str_split is reverse translating an amino acid sequence.

    <?php
    /* reverse translate an aa sequence using its dna counterpart */
    function reverseTranslate($aaSeq,$ntSeq){
          $nt=str_split($ntSeq,3);
          $aa=str_split($aaSeq,1);
          $gapChar=array('*','-');

          $numAa=count($aa);
          $ntIndex=0;
          $newNtSeq="";
      for(    $i=0;$i<$numAa;$i++){
            // if the aa is a gap, then just put on a gap character
            if(in_array($aa[$i],$gapChar)){
              $newNtSeq.='---';
        }
        else{
              $newNtSeq.=$nt[$ntIndex];
              $ntIndex++;
        }
      }
      return     $newNtSeq;
    }
    ?>
    up
    -7
    alex-glebe at mail dot ru
    1 year ago
    Empty string Does'n returns Empty array!

    $arr0 = str_split("");
    print_r($arr0);

    Array
    (
        [0] =>
    )
    add a note add a note
    To Top