PHP: chr - Manual

chr

JasonLauDotBiz
16-Feb-2006 07:34


I didn't see it here, so here's simple random string generation using char.



for($i=0; $i<7; $i++){

$random_string .= chr(rand(0,25)+65);

}

echo $random_string;

sgaston at mercy corps dot ()rg
13-Feb-2006 02:52


I found this function useful as a way to detect and to replace Microsoft Smart Quotes when desplaying info on a webpage.



The following lines seem to do the trick:



<?php

$text = "string containing Microsoft Smart Quotes...";

$chrs = array (chr(150), chr(147), chr(148), chr(146));

$repl = array ("-", "\"", "\"", "'");

$text = str_replace($chrs, $repl, $text);

?>

plugwash at p10link dot net
14-Jan-2006 12:41


bear in mind that php doesn't really care about character sets. php strings are just arbitary byte sequences thier meaning (especailly when you go beyond code 127) depends entirely on whats interpreting the data (in the case of a browser the charset specified in the http headers).

admin at icstrategy dot midgetforhire dot com
08-Jan-2006 10:51


I made a password generator with this function...



<?php

$passlength = 8;

$pass = "";

$i = 0;

while($i <= $passlength)

    {

    $pass .= chr(rand(33,126));

    $i++;

    }

echo $pass;

?>



Ofcourse you can change passlength.



Example of an 8-char password:

AFJ\)t'u}



I realise it isn't compatible for all sites, but most will accept :)

bg at ms dot com
15-Oct-2005 11:20


"If anyone can shed some light on what the difference is, please do."



This is what happens when you give bright young people new power but without old understanding.



A line feed

...........does this.



A carriage return

does this.



The "carriage" is the typewriter (or teletypewriter's) strikehead mechanism.  The "return" means return to leftmost margin; whereas, linefeed means just go down one line but remain at unaltered horizontal position.

php at elijahtech dot com
25-Aug-2005 08:52


Based on Mike's code, here are some handy functions to convert integer numbers into an alphanumeric form based on a custom character set.  Meaning, the array $chrs can include anything, and as long as the same $chrs is used in the decoding, it will always work.  I am using it a condense a generated ID that gets displayed.



e.g., g5 = 997, 10000093 = FXtP -- Much shorter!



Elijah

-----------------------------------------------------------

$chrs = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S' ,'T', 'U', 'V', 'W', 'X', 'Y', 'Z');



function int_to_alph($int, $chrs)

{

  $base = sizeof($chrs);

  do {

    $alph = $chrs[($int % $base)] . $alph;

  } while($int = intval($int / $base));

  return $alph;

}



function alph_to_int($alph, $chrs)

{

  $base = sizeof($chrs);

  for($i = 0, $int = 0; $i < strlen($alph); $i++)

  {

    $int += intval(array_search(substr($alph, strlen($alph) - $i - 1, 1), $chrs)) * pow($base, $i);

  }

  return $int;

}

grey - greywyvern - com
19-Aug-2005 07:55


I spent hours looking for a function which would take a numeric HTML entity value and output the appropriate UTF-8 bytes.  I found this at another site and only had to modify it slightly; so I don't take credit for this.



<?php function unichr($dec) { 

  if ($dec < 128) { 

    $utf = chr($dec); 

  } else if ($dec < 2048) { 

    $utf = chr(192 + (($dec - ($dec % 64)) / 64)); 

    $utf .= chr(128 + ($dec % 64)); 

  } else { 

    $utf = chr(224 + (($dec - ($dec % 4096)) / 4096)); 

    $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64)); 

    $utf .= chr(128 + ($dec % 64)); 

  } 

  return $utf;

} ?>



So for example:



<?php



  $str = "Chinese: &#20013;&#25991;";

  $str = preg_replace("/&#(\d{2,5});/e", "unichr($1);", $str);



?>

Mike
28-Jun-2005 07:43


Hi out there!



Here are two usefull functions to convert ordinal values to int value and back (unlimited length).



For Example:

'A' = 1

'B' = 2

'C' = 3

'AA' = 27

'ABC' = 731



Convert ordinal value to INT:



function convertAlphabetToInt($alpha_string) {

    $int_wert=0;

    $potenzcounter=0;

    for ($i=strlen($alpha_string);$i>0;$i--) {

        $ordinalwert=(ord(substr($alpha_string,$i-1,1))-64);

        $int_wert+=$ordinalwert*pow(26,$potenzcounter);

        $potenzcounter++;

    }

    return $int_wert;

}



And back from INT to ordinal:



function convertIntToAlphabet($int_wert) {

    if($int_wert%26>=1) {

        $alpha_string=chr(($int_wert%26)+64).$alpha_string;

        $alpha_string=convertIntToAlphabet($int_wert/26).$alpha_string;

    }

    return $alpha_string;

}



This functions will return for example:

convertAlphabetToInt("ABCD") => Output: 19010

convertIntToAlphabet(19010) = Output: "ABCD"



I hope someone can use it :)

Greetings,

Mike

24-May-2005 07:15


If you want to increment your letter, which is stored as a string, you have to convert it back to an integer first.



<?php

    $letter=strtolower($_GET['letter']);    //You wanted this originally, but not decided you want the previous letter

    $letter=ord($letter);            //Convert to an integer

    $letter=chr($letter-1);            //Convert back to a string, but the previous letter (naturally won't work with A or a)

?>

mike at go dot online dot pt
11-Mar-2005 12:18


In addition to what mcusack wrote about new lines in text files under Windows:



<?php

$text = "First line\r\n";

$text .= "Second line";

echo $text;

?>

Will output:

First lineSecond line



<?php

$text = "First line" . chr(13) . chr(10);

$text .= "Second line";

echo $text;

?>

Will output:

First line

Second line

sarabas at itstudio dot pl
17-Feb-2005 04:26


The following function helped me to generate ascii-only usernames from firstname/lastname containing iso-8859-2 characters. The convertion array was based on contents of 'man iso-8859-2'.



Example: iso2ascii("b&#322;a&#380;ej.&#378;d&#378;b&#322;o") returns "blazej.zdzblo"



function iso2ascii($str) {

 $arr=array(

  chr(161)=>'A', chr(163)=>'L', chr(165)=>'L', chr(166)=>'S', chr(169)=>'S',

  chr(170)=>'S', chr(171)=>'T', chr(172)=>'Z', chr(174)=>'Z', chr(175)=>'Z',

  chr(177)=>'a', chr(179)=>'l', chr(181)=>'l', chr(182)=>'s', chr(185)=>'s',

  chr(186)=>'s', chr(187)=>'t', chr(188)=>'z', chr(190)=>'z', chr(191)=>'z',

  chr(192)=>'R', chr(193)=>'A', chr(194)=>'A', chr(195)=>'A', chr(196)=>'A',

  chr(197)=>'L', chr(198)=>'C', chr(199)=>'C', chr(200)=>'C', chr(201)=>'E',

  chr(202)=>'E', chr(203)=>'E', chr(204)=>'E', chr(205)=>'I', chr(206)=>'I',

  chr(207)=>'D', chr(208)=>'D', chr(209)=>'N', chr(210)=>'N', chr(211)=>'O',

  chr(212)=>'O', chr(213)=>'O', chr(214)=>'O', chr(216)=>'R', chr(217)=>'U',

  chr(218)=>'U', chr(219)=>'U', chr(220)=>'U', chr(221)=>'Y', chr(222)=>'T',

  chr(223)=>'s', chr(224)=>'r', chr(225)=>'a', chr(226)=>'a', chr(227)=>'a',

  chr(228)=>'a', chr(229)=>'l', chr(230)=>'c', chr(231)=>'c', chr(232)=>'c',

  chr(233)=>'e', chr(234)=>'e', chr(235)=>'e', chr(236)=>'e', chr(237)=>'i',

  chr(238)=>'i', chr(239)=>'d', chr(240)=>'d', chr(241)=>'n', chr(242)=>'n',

  chr(243)=>'o', chr(244)=>'o', chr(245)=>'o', chr(246)=>'o', chr(248)=>'r',

  chr(249)=>'u', chr(250)=>'u', chr(251)=>'u', chr(252)=>'u', chr(253)=>'y',

  chr(254)=>'t'

 );

 return strtr($str,$arr);

}

15-Dec-2004 10:04


Same function as suggested by tippy2k/jmartin. tippy2k's code seems to have a syntax error in the function declaration; jmartin's code throws a notice. 

So here's yet another version, without temporary variables and loops:



<?

// 1 <= $a <= 702

function col2str($a) {

 return ($a-->26?chr(($a/26+25)%26+ord('A')):'').chr($a%26+ord('A'));

}



// Example

$colname = col2str(1) // returns "A"

$colname = col2str(27) // returns "AA"

$colname = col2str(702) // returns "ZZ"

?>

jon
15-Sep-2004 04:11


in response to jcokos's function for catching non-Ascii values when converting to entitites for XML. 



I have found it better to use htmlspecialchars rather than htmlentities because htmlentities does convert some non-Ascii characters to entitities, for example the copyright symbol. To be fully compliant with XML, the numeric entity should be used, rather than the symbolic version used in htmlentities.



<?php

   function strictify ( $string ) {



       $fixed = htmlspecialchars( $string, ENT_QUOTES );



       $trans_array = array();

       for ($i=127; $i<255; $i++) {

           $trans_array[chr($i)] = "&#" . $i . ";";

       }



       $really_fixed = strtr($fixed, $trans_array);



       return $really_fixed;



   }

?>

tenyou at gmail dot com
14-Jul-2004 11:05


When having to deal with parsing an IIS4 or IIS5 metabase dump I wrote a simple function for converting those MS hexidecimal values into their ascii counter parts. Hopefully someone will find use for it.





<?php


function hex_decode($string)  {


        for ($i=0; $i < strlen($string); $i)  {


        $decoded .= chr(hexdec(substr($string,$i,2)));


        $i = (float)($i)+2;


        }


return $decoded;


}


?>

tippy2k
13-May-2004 07:27


Working on the same thing as jmartin today.  701 is the limit of the script, 'ZZ'.  This should work a little faster.  Hope it helps.



<?

function SSkey($xkey+1) {

    $prefix = chr(floor($xkey+1 / 26)+64);

    if($prefix == chr(64)) unset($prefix);

    $suffix = chr($xkey+1 - (floor($xkey+1 / 26)*26) +64);

    if($suffix == chr(64)) {

        $prefix = chr( ord($prefix) -1);

        if($prefix == chr(64)) unset($prefix);

        $suffix = 'Z';

    } 

    $sskey = "$prefix$suffix"; 

    return $sskey;

}

?>

jmartin at prescientsoftware dot com
13-Apr-2004 02:42


Here is a function that will convert column numbers in to a letters for use in a spreadsheet.  It is limited up to 'ZZ' but can easliy by modifed.





<?php


 function col2chr($a){


        if($a<27){


            return strtoupper(chr($a+96));    


        }else{


            while($a > 26){


                $b++;


                $a = $a-26;                


            }                   


            $b = strtoupper(chr($b+96));    


            $a = strtoupper(chr($a+96));                


            return $b.$a;


        }


    }


?>

perrodin at laposte dot net
11-Apr-2004 04:20


Note that if the number is higher than 256, it will return the number mod 256.

For example :

chr(321)=A because A=65(256)

goffrie at somewhere dot ca
05-Apr-2004 05:06


ASCII 7 makes a beep.

so

print chr(7);

is useful in long scripts (like ones that download big files) when you want to get the user's attention after a long time of waiting.

---------------------

Me:)

---------------------

mcusack at fastlanecompanies dot com
25-Mar-2004 04:46


when working with output to a windows system i.e. a textfile the end of line "\n" will not return a valid newline that windows will understand (this is due to a lack of standards accross OS types) this is because windows reads new lines as carriage return and an additional char the linefeed the traditional "\n" so in short use the following to produce a new line under a windows text environment "\r\n"





// not tested but this should work in most cases (i think....)





<?php


function win_nl2br($stringtext) {


return str_replace("\r\n", "<br>", $stringtext);


}





function win_br2nl($stringtext) {


return str_replace("<br>", "\r\n", $stringtext);


}


?>





Hope this is as informative to you as it was to me ......

loremaster
09-Sep-2003 01:27


Re: Kristin: Line feed vs carriage return



I may be wrong, it's been a while since I cared about the difference.



Line feeds add a new line below the current carriage position and moves the carriage to it.

Carriage return brings the carriage (or cursor, if you like) to the beginning of the line.



Most mutliline text fields, when you press Enter, you get both a line feed (new line) and a carriage return (return).  Typically I use the strtr function and replace "\n\r" rather than searching for ascii 13 and 10.  There are many ways, of course, so your mileage may vary.

jgray at triangle dash solutions dot com
25-Jul-2003 10:20


Lowercase alphabet:

for($a=97;$a<(97+26);$a++){ echo chr($a); }

infoserv at chollian dot net
24-Jun-2003 08:16


Cutting Korean(2Byte)-String





<?php


function cutStr($str,$len){


    if(strlen($str) > $len){


        $str = substr($str,0,$len - 2);


        if(strlen(substr(strrchr($str," "),1)) % 2)


            $str = substr($str,0,strlen($str) - 1);


        $str .= "..";


    }


    return $str;


}


?>

jcokos
26-Mar-2003 06:12


A quick function that I use to make strings "XML" compliant, changing every special character into their #$... equivalent.





htmlentities doesn't get all of the chars above 127, so the second part of this (which I stole from one of the comments above) finishes the process, returning a nice, xml happy string.





<?php


    function strictify ( $string ) {





        $fixed = htmlentities( $string, ENT_QUOTES );





        $trans_array = array();


        for ($i=127; $i<255; $i++) {


           $trans_array[chr($i)] = "&#" . $i . ";";


        }





        $really_fixed = strtr($fixed, $trans_array);





        return $really_fixed;





    }


?>





HTH

avenger at php dot net
22-Mar-2003 01:26


I usally used this code to test a Chinese string:





<?php


$chinese_str = "�²���";


if (preg_match("/^[".chr(0xa1)."-".chr(0xff)."_-]+$/",$chinese_str) {


    echo 'This is a Chinese word..';


} else {


    echo 'This is not a Chinese word..';


}


?>

Kristin
06-Mar-2003 08:19


Note that chr(10) is a 'line feed' and chr(13) is a 'carriage return' and they are not the same thing! I found this out while attempting to parse text from forms and text files for inclusion as HTML by replacing all the carriage returns with <BR>'s only to find after many head-scratchings that I should have been looking for line feeds. If anyone can shed some light on what the difference is, please do.





If you're planning on saving text from a form into a database for later display, you'll need to apply the following function so that it gets saved with the proper HTML tags.





<?php


$text = str_replace ( chr(10), "<BR>", $text );


?>





When you want to plug it back into that form for editing you need to convert it back.





<?php


$text = str_replace ( "<BR>", chr(10), $text)


?>





Hope this saves somebody some trouble. :)

joeldegan AT yahoo.com
14-Dec-2002 02:53


Want terminal colors in command line php scripts?





This should take care of that.


<?





$_colors = array(


        'LIGHT_RED'      => "[1;31m",


        'LIGHT_GREEN'     => "[1;32m",


        'YELLOW'     => "[1;33m",


        'LIGHT_BLUE'     => "[1;34m",


        'MAGENTA'     => "[1;35m",


        'LIGHT_CYAN'     => "[1;36m",


        'WHITE'     => "[1;37m",


        'NORMAL'     => "[0m",


        'BLACK'     => "[0;30m",


        'RED'         => "[0;31m",


        'GREEN'     => "[0;32m",


        'BROWN'     => "[0;33m",


        'BLUE'         => "[0;34m",


        'CYAN'         => "[0;36m",


        'BOLD'         => "[1m",


        'UNDERSCORE'     => "[4m",


        'REVERSE'     => "[7m",





);





function termcolored($text, $color="NORMAL", $back=1){


    global $_colors;


    $out = $_colors["$color"];


    if($out == ""){ $out = "[0m"; }


    if($back){


        return chr(27)."$out$text".chr(27).chr(27)."[0m".chr(27);


    }else{


        echo chr(27)."$out$text".chr(27).chr(27)."[0m".chr(27);


    }//fi


}// end function





echo termcolored("test\n", "BLUE");


?>

gschafer at robandger dot com
08-Nov-2002 04:17


Here's a small function I wrote up to generate random passwords using the chr() function.





<?php


function randPass($len)


{


 $pw = ''; //intialize to be blank


 for($i=0;$i<$len;$i++)


 {


   switch(rand(1,3))


   {


     case 1: $pw.=chr(rand(48,57));  break; //0-9


     case 2: $pw.=chr(rand(65,90));  break; //A-Z


     case 3: $pw.=chr(rand(97,122)); break; //a-z


   }


 }


 return $pw;


}


?>





Example:





<?php


 $password = randPass(10); //assigns 10-character password


?>





I found this useful in my early coding days... I'm sure someone else will too :D

28-Jun-2002 08:05


This bit of code will convert all those lovely tilde,umlaut etc. etc. characters into safe character codes:





<?php


    $trans_array = array();


    for ($i=127; $i<255; $i++) {


        $trans_array[chr($i)] = "&#" . $i . ";";


    }


    $outtext = strtr($intext, $trans_array);


?>

webmaster at project-enigma dot net
13-Apr-2002 12:51


\n == &#13;

Usefull if u want to display multi-line-alt-strings

e.g. <img src="/gifs/php_logo.gif" alt="Here u can see the&#13;PHPLogo&#13;3rd line">

happyevil(at)1218.org
26-Mar-2001 07:31


Here is a function that's help me find what chr(number) outputs what character quicker than typing out 256 echo tags.





<?php


 function listChr(){


  for ($i = 0; $i < 256; ++$i) {


  static $genNum;


  $genNum++;


  echo "chr($genNum) will output '";


  echo (chr($genNum));


  echo "'< br>\n";


  }


}


listChr();


?>





Another helpful chr is #9, being a tab.  Quite using when making error logs.





 $tab = (chr(9));


 echo "<pre>error{$tab}date{$tab}time</pre>";





 -- HappyEvil

ddawsonNOSPAM at execpc dot com
09-May-2000 04:59


[Editor's note:





%c is defined as: "Print the character belonging to the ascii code given"





chr() just gives a string, so you need to use %s, even if the string consists of only one character. This is consistent with other languages.


--Jeroen@php.net]








Learn from my mistake:


Do not expect this to work!





<?php


$c_question = chr(63);


$v_out = sprintf("<%cphp\n", $c_question);


//... more stuff being sprintf'd into v_out here ...


$v_out = sprintf("%s%c>\n", $v_out, $c_question);


$v_fp = fopen("foofile", "w");


if ($v_fp)


{


     fwrite($v_fp, $v_out, strlen($v_out));


     fclose($v_fp);


}


?>





When I did this, foofile contained <NUL NUL NUL NUL NUL>.


I spun my wheels quite awhile looking at fputs, fwrite to verify I was calling those functions correctly.


My mistake was using $c_question = chr(63) instead of


$c_question = 63 (correct).  Then everything worked fine.

chr

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