The description of the function is slightly inaccurate. A trailing $end is also added.
(PHP 4, PHP 5, PHP 7, PHP 8)
chunk_split — 将字符串分割成小块
$string
, int $length = 76
, string $separator = "\r\n"
) : string
使用此函数将字符串分割成小块非常有用。例如将
base64_encode() 的输出转换成符合 RFC 2045 语义的字符串。它会在每
length 个字符后边插入
separator。
string要分割的字符。
length分割的尺寸。
separator行尾序列符号。
返回分割后的字符。
Example #1 chunk_split() 例子
<?php
// 使用 RFC 2045 语义格式化 $data
$new_string = chunk_split(base64_encode($data));
?>
The description of the function is slightly inaccurate. A trailing $end is also added.
As an alternative for qeremy [atta] gmail [dotta] com
There is much shorter way for binarysafe chunking of multibyte string:
<?php
function word_chunk($str, $len = 76, $end = "\n") {
$pattern = '~.{1,' . $len . '}~u'; // like "~.{1,76}~u"
$str = preg_replace($pattern, '$0' . $end, $str);
return rtrim($str, $end);
}
$str = 'русский';
echo chunk_split($str, 3) ."\n";
echo word_chunk($str, 3) . "\n";
?>
р?
?с
с?
?и
й
рус
ски
й
Important note is the maximum line length and the recommended one. The standard says:
"Lines in a message MUST be a maximum of 998 characters excluding the CRLF, but it is RECOMMENDED that lines be limited to 78 characters excluding the CRLF. "
See PHP8中文参考手册 for chunk_split() Which is set to 76 characters long chunk and "\r\n" at the end of line by default.
An alternative for unicode strings;
<?php
function chunk_split_unicode($str, $l = 76, $e = "\r\n") {
$tmp = array_chunk(
preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY), $l);
$str = "";
foreach ($tmp as $t) {
$str .= join("", $t) . $e;
}
return $str;
}
$str = "Yar?m kilo ?ay, yar?m kilo ?eker";
echo chunk_split($str, 4) ."\n";
echo chunk_split_unicode($str, 4);
?>
Yar?
?m k
ilo
?ay
, ya
r?m
kil
o ?
eker
Yar?
m ki
lo ?
ay,
yar?
m ki
lo ?
eker
If you are using UTF-8 charset you will face a problem with Arabic language
to solve this problem i used this function
<?php
function chunk_split_($text,$length,$string_end)
{
$text = iconv("UTF-8","windows-1256",$text);
$text = str_split($text);
foreach($text as $val)
{
if($a !== $val)
{
$a = $val;
$x = 0;
}else{
$a = $val;
$x++;
}
if($x > $length)
{
$new_text .= $val.$string_end;
$x = 0;
}else
{
$new_text .= $val;
}
}
$new_text = iconv("windows-1256","UTF-8",$new_text);
return $new_text;
}
?>
chunk_split() is not multibyte safe. If you ever run into needing the function that is multibyte safe, here you go:
<?php
function mbStringToArray ($str) {
if (empty($str)) return false;
$len = mb_strlen($str);
$array = array();
for ($i = 0; $i < $len; $i++) {
$array[] = mb_substr($str, $i, 1);
}
return $array;
}
function mb_chunk_split($str, $len, $glue) {
if (empty($str)) return false;
$array = mbStringToArray ($str);
$n = 0;
$new = '';
foreach ($array as $char) {
if ($n < $len) $new .= $char;
elseif ($n == $len) {
$new .= $glue . $char;
$n = 0;
}
$n++;
}
return $new;
}
?>
I've found this quite useful for simulating various kinds of shuffles with cards. It is humorous but can imitate multiple deck cuts and other (imperfectly) random events.
<?php
function truffle_shuffle($body, $chunklen = 76, $end = "\r\n")
{
$chunk = chunk_split($body, $chunklen, "-=blender=-");
$truffle = explode("-=blender=-",$chunk);
$shuffle = shuffle($truffle);
$huknc = implode($end,$shuffle);
return $huknc;
}
?>
@Royce
I think this is better, since you can still use the ampersand in your text:
<?php
function HtmlEntitySafeSplit($html,$size,$delim)
{
$pos=0;
for($i=0;$i<strlen($html);$i++)
{
if($pos >= $size && !$unsafe)
{
$out.=$delim;
$unsafe=0;
$pos=0;
}
$c=substr($html,$i,1);
if($c == "&")
$unsafe=1;
elseif($c == ";")
$unsafe=0;
elseif($c == " ")
$unsafe=0;
$out.=$c;
$pos++;
}
return $out;
}
?>
"version" of chunk_split for cyrillic characters in UTF-8
public function UTFChunk($Text,$Len = 10,$End = "\r\n")
{
if(mb_detect_encoding($Text) == "UTF-8")
{
return mb_convert_encoding(
chunk_split(
mb_convert_encoding($Text, "KOI8-R","UTF-8"), $Len,$End
),
"UTF-8", "KOI8-R"
);
} else
{
return chunk_split($Text,$Len,$End);
}
}
this is example for russian language
Here's a version of Chunk Split I wrote that will not split html entities. Useful if you need to inject something in html (in my case, <wbr/> tags to allow for long text wrapping).
<?php
function HtmlEntitySafeSplit($html,$size,$delim)
{
$pos=0;
for($i=0;$i<strlen($html);$i++)
{
if($pos >= $size && !$unsafe)
{
$out.=$delim;
$unsafe=0;
$pos=0;
}
$c=substr($html,$i,1);
if($c == "&")
$unsafe=1;
elseif($c == ";")
$unsafe=0;
$out.=$c;
$pos++;
}
return $out;
}
?>
When using ssmtp for simple command line mailing:
$mail_to = "destination@emailbox.com";
$msg = "this would be an actual base64_encoded gzip msg";
$date = date(r);
$mail = "X-FROM: root@sender.org \n";
$mail .= "X-TO: ".$mail_to. " \n";
$mail .= "To: ".$mail_to. " \n";
$mail .= "Date: $date \n";
$mail .= "From: root@sender.org \n";
$mail .= "Subject: lifecheck \n";
$mail .= $msg." \n";
exec("echo '$mail' | /usr/sbin/ssmtp ".$mail_to);
be sure to invoke chunk_split() on your message body - ssmtp becomes unhappy with long lines and will subsequently trash your message.
This function is very simple and many other functions make this on PHP 5 and even some ones in 4 the good think about this one is that work on php 3.0.6 and 4
function split_hjms_chars($xstr, $xlenint, $xlaststr)
{
$texttoshow = chunk_split($xstr,$xlenint,"\r\n");
$texttoshow = split("\r\n",$texttoshow);
$texttoshow = $texttoshow[0].$xlaststr;
return $texttoshow;
}
// For use
echo split_hjms_chars("This is your text",6,"...");
// Will return
This i...
It is useful to cut long text on preview lists and if the server it's old.
Hope it helps some one. Hans Svane
I'm not sure what versions this also occurs in but the output of chunk_split() in PHP 5.0.4 does not match the output in other versions of PHP.
In all versions of PHP I have used, apart from 5.0.4 chunk_split() adds the separator (\r\n) to the end of the string. But in PHP 5.0.4 this does not happen. This had a fairly serious impact on a library I maintain so it may also affect others who are not aware of this.
In reply to "adrian at zhp dot inet dot pl" digit grouping function:
<?php
$number = strrev(chunk_split (strrev($number), 3,' '));
//If $number is '1234567', result is '1 234 567'.
?>
There is a much more simple way of doing this, by using the built-in number_format() function.
<?php
$number = number_format($number,2,"."," ");
//This will round $number to 2 decimals, use the dot (".")
//as decimal point, and the space (" ") as thousand sepparator.
?>
Not quite completely obvious, but...
you can un_chunk_split() by:
$long_str = str_replace( "\r\n", "", $chunked_str );
another way to group thousands in a number, which is much simpler, is built into PHP :)
www.php.net/number_format
To phpkid:
This is a much simpler solution.
<?php
function longWordWrap($string) {
$string = str_replace("\n", "\n ", $string); // add a space after newline characters, so that 2 words only seperated by \n are not considered as 1 word
$words = explode(" ", $string); // now split by space
foreach ($words as $word) {
$outstring .= chunk_split($word, 12, " ") . " ";
}
return $outstring;
}
?>
Well I have been having issues with a shoutbox I am coding it would keep expanding the <TD> if there were large words in it but I fixed it with this:
function PadString($String){
$Exploded = explode(" ", $String);
$Max_Parts = count($Exploded);
$CurArray = 0;
$OutString = '';
while($CurArray<=$Max_Parts)
{
$Peice_Size = strlen($Exploded[$CurArray]);
if($Peice_Size>15)
{
$OutString .= chunk_split($Exploded[$CurArray], 12, " ");
$CurArray++;
} else {
$OutString .= " ".$Exploded[$CurArray];
$CurArray++;
}
}
return $OutString;
}
the best way to solve the problem with the last string added by chunk_split() is:
<?php
$string = '1234';
substr(chunk_split($string, 2, ':'), 0, -1);
// will return 12:34
?>
>> chunk_split will also add the break _after_ the last occurence.
this should be not the problem
substr(chunk_split('FF99FF', 2, ':'),0,8);
will return FF:99:FF