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str_split

(PHP 5)

str_split --  Convert a string to an array

Description

array str_split ( string string [, int split_length] )

Converts a string to an array. If the optional split_length parameter is specified, the returned array will be broken down into chunks with each being split_length in length, otherwise each chunk will be one character in length.

FALSE is returned if split_length is less than 1. If the split_length length exceeds the length of string, the entire string is returned as the first (and only) array element.

例子 1. Example uses of str_split()

<?php

$str = "Hello Friend";

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

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

?>

Output may look like: 

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
)

例子 2. Examples related to str_split()

<?php

$str = "Hello Friend";

echo $str{0};  // H
echo $str{8};  // i

// Creates: array('H','e','l','l','o',' ','F','r','i','e','n','d')
$arr1 = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);

?>

See also chunk_split(), preg_split(), split(), count_chars(), str_word_count(), and for.


add a note add a note User Contributed Notes
webmaster at nsssa dot ca
28-Oct-2006 10:45
I noticed in the post below me that his function would return an array with an empty key at the end.

So here is just a little fix for it.

<?php

//Create a string split function for pre PHP5 versions
function str_split($str, $nr) { 
            
     //Return an array with 1 less item then the one we have
     return array_slice(split("-l-", chunk_split($str, $nr, '-l-')), 0, -1);
    
}

?>
05-Oct-2006 08:14
//fast & short version od str_split PHP3, 4x
function string_split($str, $nr){   
   return split("-l-", chunk_split($str, $nr, '-l-'));
}
//example :
print_r(string_split('123412341234', 4));
ference at super_delete_brose dot co dot uk
01-Sep-2006 03:22
If you are looking for a way to split multibyte strings then this may come in handy:

<?php
$text  = "sprbrs";

function mb_str_split($str, $length = 1) {
  if ($length < 1) return FALSE;

  $result = array();

  for ($i = 0; $i < mb_strlen($str); $i += $length) {
   $result[] = mb_substr($str, $i, $length);
  }

  return $result;
}

$solo = mb_str_split($text);
$quintet = mb_str_split($text, 5);

print_r($solo);
print_r($quintet);
?>

Spits out:

Array
(
   [0] => s
   [1] =>
   [2] => p
   [3] =>
   [4] => r
   [5] => b
   [6] => r
   [7] =>
   [8] => s
   [9] =>
)
Array
(
   [0] => spr
   [1] => brs
)
fstorm2 at gmail dot com
29-Aug-2006 05:08
If you use PHP 4 and don't need the split_length parameter, here's the shortest replacement:

<?php

preg_split('#(?<=.)(?=.)#s', $str);

?>
http://www.matt-fletcher.co.uk/
21-Aug-2006 07:44
A simple way to split credit card numbers into chunks of four numbers:

<?php
echo implode(' ',str_split($card_number,4));
?>
malmsteenforce at tlen dot pl
20-Jul-2006 01:52
<?
//fast & short version od str_split

function string_split($str)
     {
       $str_array=array();
       $len=strlen($str);
       for($i=0;$i<$len;$i++) $str_array[]=$str{$i};
       return $str_array;
       }
//example :
var_dump (string_split("split this"));
?>
user at mockme dot com
25-Mar-2006 09:53
found this great example on a php board for those not using php5, as an alternative to the posts below this

<?php
if(!function_exists('str_split')){
   function str_split($string,$split_length=1){
       $count = strlen($string); 
       if($split_length < 1){
           return false; 
       } elseif($split_length > $count){
           return array($string);
       } else {
           $num = (int)ceil($count/$split_length); 
           $ret = array(); 
           for($i=0;$i<$num;$i++){ 
               $ret[] = substr($string,$i*$split_length,$split_length); 
           } 
           return $ret;
       }     
   } 
}
?>
simple
16-Mar-2006 11:54
if (!function_exists("str_split")) {
   function str_split($string, $length = 1) {
       if ($length <= 0) {
           trigger_error(__FUNCTION__."(): The the length of each segment must be greater then zero:", E_USER_WARNING);
           return false;
       }
       $splitted  = array();
       while (strlen($string) > 0) {
           $splitted[] = substr($string, 0, $length);
           $string = substr($string, $length);
       }
       return $splitted;
   }
}
14-Mar-2006 09:49
Note to function by carlosreche at yahoo dot com.

The while:
<?php
...
               while ($str_length--) {
                   $splitted[$i] = $string[$i++];
               }
...
?>
.. result in index starting at 1.
Ie: str_split("ABC") gives
Array
(
   [1] => A
   [2] => B
   [3] => C
)
While php5's str_split("ABC") gives
Array
(
   [0] => A
   [1] => B
   [2] => C
)
And his str_split("ABC",2) gives index starting at 0.
Change to this (or something similar):
<?php
...
               while ($str_length--) {
                   $splitted[$i] = $string[$i];
                   $i++;
               }
...
?>
.... or use heavyraptor's function. A bit more sclick,..
heavyraptor
11-Mar-2006 06:07
I think that the last post by carlosreche at yahoo dot com is too complicated.
It's much easier if you do it like this:

<?php
if (!function_exists("str_split")) {
  function str_split($str,$length = 1) {
   if ($length < 1) return false;
   $strlen = strlen($str);
   $ret = array();
   for ($i = 0; $i < $strlen; $i += $length) {
     $ret[] = substr($str,$i,$length);
   }
   return $ret;
  }
}
?>

I hope it helps for those with PHP <5
carlosreche at yahoo dot com
15-Feb-2006 08:23
For those who work with PHP < 5:

<?php

if (!function_exists("str_split")) {
   function str_split($string, $length = 1) {
       if ($length <= 0) {
           trigger_error(__FUNCTION__."(): The the length of each segment must be greater then zero:", E_USER_WARNING);
           return false;
       }
       $splitted  = array();
       $str_length = strlen($string);
       $i = 0;
       if ($length == 1) {
           while ($str_length--) {
               $splitted[$i] = $string[$i++];
           }
       } else {
           $j = $i;
           while ($str_length > 0) {
               $splitted[$j++] = substr($string, $i, $length);
               $str_length -= $length;
               $i += $length;
           }
       }
       return $splitted;
   }
}

?>
Hage Yaapa
04-Feb-2006 10:27
The very handy str_split() was introduced in PHP 5, but a lot of us are still forced to use PHP 4 at our host servers. And I am sure a lot of beginners have looked or are looking for a function to accomplish what str_split() does.

Taking advantge of the fact that strings are 'arrays' I wrote this tiny but useful e-mail cloaker in PHP, which guarantees functionality even if JavaScript is disabled in the client's browser. Watch how I make up for the lack of str_split() in PHP 4.3.10.

<?php

// cloackEmail() accepts a string, the email address to be cloaked
function cloakEmail($email) {

// We create a new array called $arChars, which will contain the individula characters making up the email address. The array is blank for now.
   $arChars = array();

// We extract each character from the email 'exploiting' the fact that strings behave like an array: watch the '$email[$i]' bit, and beging to fill up the blank array $arChars
   for ($i = 0; $i < strlen($email); $i++) { $arChars[] = $email[$i]; }

// Now we work on the $arChars array: extract each character in the array and print out it's ASCII value prefixed with '&#' to convert it into an HTML entity
   foreach ($arChars as $char) { print '&#'.ord($char); }

// The result is an email address in HTML entities which, I hope most email address harvesters can't read.

}
print cloakEmail('someone@nokikon.com');
?>

###### THE CODE ABOVE WITHOUT COMMENTS ######

<?php
function cloakEmail($email) {
   $arChars = array();
   for ($i = 0; $i < strlen($email); $i++) { $arChars[] = $email[$i]; }
   foreach ($arChars as $char) { print '&#'.ord($char); }
}
print cloakEmail('someone@nokikon.com');
?>
In creating this little utility, I demonstrated how the lack of str_split() can be made up in PHP < 5. If you got how it was accomplished, you could write a function to do exactly what str_split() does in PHP 5 and even name it 'str_split()'. :)
organek at hektor dot umcs dot lublin dot pl
21-May-2005 07:57
[Editor's Note: Or just: php.net/wordwrap]
This is a little function to split a string into shorter strings with max lenght $n in such way, that it don't split words (it search for spaces), it's usefull for articles or sth.
Result is put in $ttab variable, and function result is number of "pages".

<?php
function divide_text($text, $n, &$ttab) {
  
   $ttab = array();
   $l = strlen($text); // text length
   $cb = 0;    //copy begin from..
   $p = 0; // parts
  
   if ($l  <= $n) {
       $ttab[0] = $text;
       return 1;
   } else {
       $ctrl = 1;
       while(((($p-1) * $n) < $l) && ($ctrl < 100)) {
       $crtl++; // control variable, to protect from infinite loops
      
       $tmp = substr($text, $cb, $n);
      
       // we're looking for last space in substring
       $lastpos = strrpos($tmp," ");   
      
       if ( (is_bool($lastbool) && !$lastpos) || ( $l - $cb <= $n)) {
           $ttab[$p] = $tmp;
                      
       } else  {
           $tmpgood = trim(substr($tmp, 0,$lastpos));  // if they were another spaces at the end..
           $ttab[$p] = $tmpgood;
           $cb += $lastpos + 1 ;
          
       }; // if
       $p++;
       }; //for
       return $p;
   }; // if
  

} // divide text

?>
aidan at php dot net
21-May-2004 12:53
This functionality is now implemented in the PEAR package PHP_Compat.

More information about using this function without upgrading your version of PHP can be found on the below link:

http://pear.php.net/package/PHP_Compat
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