mb_substr

(PHP 4 >= 4.0.6, PHP 5)

mb_substr — Get part of string

Beschreibung

string mb_substr ( string $str , int $start [, int $length [, string $encoding ]] )

Performs a multi-byte safe substr() operation based on number of characters. Position is counted from the beginning of str. First character's position is 0. Second character position is 1, and so on.

Parameter-Liste

str: The string to extract the substring from.
start: Position of first character to use from str.
length: Maximum number of characters to use from str.
encoding: Der encoding Parameter legt das Zeichenencoding fest. Wird er nicht übergeben so wird das interne Zeichenencoding genutzt.

Rückgabewerte

mb_substr() returns the portion of str specified by the start and length parameters.

Siehe auch

mb_strcut() - Get part of string
mb_internal_encoding() - Set/Get internal character encoding

Pspell

mb_substr_count

[edit] Last updated: Sat, 07 Jan 2012

add a note User Contributed Notes mb_substr

p dot assenov at aip-solutions dot com 02-Dec-2011 09:17


I'm trying to capitalize only the first character of the string and tried some of the examples above but they didn't work. It seems mb_substr() cannot calculate the length of the string in multi-byte encoding (UTF-8) and it should be set explicitly. Here is the corrected version:





<?php


function mb_ucfirst($str, $enc = 'utf-8') {


    return mb_strtoupper(mb_substr($str, 0, 1, $enc), $enc).mb_substr($str, 1, mb_strlen($str, $enc), $enc);


}


?>





cheers!

levani9191 at gmail dot com 18-Jul-2010 03:37


A simple code that check if the latest symbol in the string is a question mark and adds one if it doesn't...



<?php $string = (mb_substr($string, -1, 1, 'UTF-8') != '?') ? $string.'?' : $string; ?>

Anonymous 26-Feb-2010 05:15


If start  is negative, the returned string will start at the start'th character from the end of string

dziamid at gmail dot com 06-Feb-2009 08:27


Here is my solution to highlighting search queries in multibyte text:



<?php

function mb_highlight($data, $query, $ins_before, $ins_after)

{

 $result = '';

 while (($poz = mb_strpos(mb_strtolower($data), mb_strtolower($query))) !== false)

 {

       $query_len = mb_strlen ($query);

       $result .= mb_substr ($data, 0, $poz).

               $ins_before.

               mb_substr ($data, $poz, $query_len).

               $ins_after;

       $data = mb_substr ($data, $poz+$query_len);

 }

 return $result;

}

?>



Enjoy!



[EDIT BY danbrown AT php DOT net: Reclassified to a more appropriate function manual page.]

projektas at gmail dot com 21-Oct-2008 06:29


First letter in upper case <hr />



<?php

header ('Content-type: text/html; charset=utf-8');



if (isset($_POST['check']) && !empty($_POST['check'])) {

    echo htmlspecialchars(ucfirst_utf8($_POST['check']));

} else {

    echo htmlspecialchars(ucfirst_utf8('Žąsinų'));

}



function ucfirst_utf8($str) {

    if (mb_check_encoding($str,'UTF-8')) {

        $first = mb_substr(

            mb_strtoupper($str, "utf-8"),0,1,'utf-8'

        );

        return $first.mb_substr(

            mb_strtolower($str,"utf-8"),1,mb_strlen($str),'utf-8'

        );

    } else {

        return $str;

    }

}

?>



<form method="post" action="" >

    <input type="input" name="check" />

    <input type="submit" />

</form>

Silvan 01-Sep-2007 03:30


Passing null as length will not make mb_substr use it's default, instead it will interpret it as 0.

<?php

mb_substr($str,$start,null,$encoding); //Returns '' (empty string) just like substr()

?>

Instead use:

<?php

mb_substr($str,$start,mb_strlen($str),$encoding);

?>

xiaogil at yahoo dot fr 02-Aug-2005 08:33


Thanks Darien from /freenode #php for the following example (a little bit changed).



It just prints the 6th character of $string.

You can replace the digits by the same in japanese, chinese or whatever language to make a test, it works perfect.



<?php

mb_internal_encoding("UTF-8");

$string = "0123456789";

$mystring = mb_substr($string,5,1);

echo $mystring;

?>



(I couldn't replace 0123456789 by chinese numbers for example here, because it's automatically converted into latin digits on this website, look : 

&#38646;&#19968;&#20108;&#19977;&#22235;

&#20116;&#20845;&#19971;&#20843;&#20061;)



gilv

drraf at tlen dot pl 23-Feb-2005 06:44


Note: If borders are out of string - mb_string() returns empty _string_, when function substr() returns _boolean_ false in this case.

Keep this in mind when using "===" comparisions.



Example code:

<?php



var_dump( substr( 'abc', 5, 2 ) ); // returns "false"

var_dump( mb_substr( 'abc', 5, 2 ) ); // returns ""



?>



It's especially confusing when using mbstring with function overloading turned on.

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