str_split
Если указан необязательный аргумент split_length , возвращаемый массив будет содержать части исходной строки длиной split_length каждая, иначе каждый элемент будет содержать один символ.
Если split_length меньше 1, возвращается FALSE . Если split_length больше длины строки string , то вся строка будет возвращена в первом и единственном элементе массива.
Примеры
Пример #1 Пример использования str_split()
$arr1 = str_split ( $str );
$arr2 = str_split ( $str , 3 );
print_r ( $arr1 );
print_r ( $arr2 );
Результат выполнения данного примера:
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 )
Примечания
Замечание:
Функция str_split() производит разбивку по байтам, а не по символам, в случае использования строк в многобайтных кодировках.
Смотрите также
- chunk_split() — Разбивает строку на фрагменты
- preg_split() — Разбивает строку по регулярному выражению
- explode() — Разбивает строку с помощью разделителя
- count_chars() — Возвращает информацию о символах, входящих в строку
- str_word_count() — Возвращает информацию о словах, входящих в строку
- for
explode
Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string separator .
Parameters
If limit is set and positive, the returned array will contain a maximum of limit elements with the last element containing the rest of string .
If the limit parameter is negative, all components except the last — limit are returned.
If the limit parameter is zero, then this is treated as 1.
Note:
Prior to PHP 8.0, implode() accepted its parameters in either order. explode() has never supported this: you must ensure that the separator argument comes before the string argument.
Return Values
Returns an array of string s created by splitting the string parameter on boundaries formed by the separator .
If separator is an empty string («»), explode() throws a ValueError . If separator contains a value that is not contained in string and a negative limit is used, then an empty array will be returned, otherwise an array containing string will be returned. If separator values appear at the start or end of string , said values will be added as an empty array value either in the first or last position of the returned array respectively.
Changelog
| Version | Description |
|---|---|
| 8.0.0 | explode() will now throw ValueError when separator parameter is given an empty string ( «» ). Previously, explode() returned false instead. |
Examples
Example #1 explode() examples
// Example 1
$pizza = «piece1 piece2 piece3 piece4 piece5 piece6» ;
$pieces = explode ( » » , $pizza );
echo $pieces [ 0 ]; // piece1
echo $pieces [ 1 ]; // piece2
// Example 2
$data = «foo:*:1023:1000::/home/foo:/bin/sh» ;
list( $user , $pass , $uid , $gid , $gecos , $home , $shell ) = explode ( «:» , $data );
echo $user ; // foo
echo $pass ; // *
Example #2 explode() return examples
/*
A string that doesn’t contain the delimiter will simply
return a one-length array of the original string.
*/
$input1 = «hello» ;
$input2 = «hello,there» ;
$input3 = ‘,’ ;
var_dump ( explode ( ‘,’ , $input1 ) );
var_dump ( explode ( ‘,’ , $input2 ) );
var_dump ( explode ( ‘,’ , $input3 ) );
The above example will output:
array(1) ( [0] => string(5) "hello" ) array(2) ( [0] => string(5) "hello" [1] => string(5) "there" ) array(2) ( [0] => string(0) "" [1] => string(0) "" )
Example #3 limit parameter examples
// positive limit
print_r ( explode ( ‘|’ , $str , 2 ));
// negative limit
print_r ( explode ( ‘|’ , $str , — 1 ));
?>
The above example will output:
Array ( [0] => one [1] => two|three|four ) Array ( [0] => one [1] => two [2] => three )
Notes
Note: This function is binary-safe.
See Also
- preg_split() — Split string by a regular expression
- str_split() — Convert a string to an array
- mb_split() — Split multibyte string using regular expression
- str_word_count() — Return information about words used in a string
- strtok() — Tokenize string
- implode() — Join array elements with a string
User Contributed Notes 3 notes
Note that an empty input string will still result in one element in the output array. This is something to remember when you are processing unknown input.
For example, maybe you are splitting part of a URI by forward slashes (like «articles/42/show» => [«articles», «42», «show»]). And maybe you expect that an empty URI will result in an empty array («» => []). Instead, it will contain one element, with an empty string:
$uri = » ;
$parts = explode ( ‘/’ , $uri );
var_dump ( $parts );
Be careful, while most non-alphanumeric data types as input strings return an array with an empty string when used with a valid separator, true returns an array with the string «1»!
var_dump(explode(‘,’, null)); //array(1) < [0]=>string(0) «» >
var_dump(explode(‘,’, false)); //array(1) < [0]=>string(0) «» >
var_dump(explode(‘,’, true)); //array(1) < [0]=>string(1) «1» >
If you want to directly take a specific value without having to store it in another variable, you can implement the following:
echo $status_only = explode(‘-‘, $status)[0];
str_split
If the optional length parameter is specified, the returned array will be broken down into chunks with each being length in length, except the final chunk which may be shorter if the string does not divide evenly. The default length is 1 , meaning every chunk will be one byte in size.
Errors/Exceptions
If length is less than 1 , a ValueError will be thrown.
Changelog
| Version | Description |
|---|---|
| 8.2.0 | If string is empty an empty array is now returned. Previously an array containing a single empty string was returned. |
| 8.0.0 | If length is less than 1 , a ValueError will be thrown now; previously, an error of level E_WARNING has been raised instead, and the function returned false . |
Examples
Example #1 Example uses of str_split()
$arr1 = str_split ( $str );
$arr2 = str_split ( $str , 3 );
print_r ( $arr1 );
print_r ( $arr2 );
The above example will output:
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 )
Notes
Note:
str_split() will split into bytes, rather than characters when dealing with a multi-byte encoded string. Use mb_str_split() to split the string into code points.
See Also
- mb_str_split() — Given a multibyte string, return an array of its characters
- chunk_split() — Split a string into smaller chunks
- preg_split() — Split string by a regular expression
- explode() — Split a string by a string
- count_chars() — Return information about characters used in a string
- str_word_count() — Return information about words used in a string
- for
User Contributed Notes 3 notes
The function str_split() is not ‘aware’ of words. Here is an adaptation of str_split() that is ‘word-aware’.
$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
);
/**
* This function is similar to str_split() but this function keeps words intact; it never splits through a word.
*
* @return array
*/
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;
>
// Overwrite the current line and accumulator with the current word
$currentLine = $currentWordWithSpace ;
$lineAccumulator = $currentWordWithSpace ;
>
if ( $currentLine !== » ) $lines [] = $currentLine ;
>
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. »
>