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这可用于在一种单字节编码（像是 ASCII、ISO-8859 或 Windows
1252）中通过传递想要的字符在编码映射表中的位置来创建单字符字符串。但是，注意此函数并不清楚任何字符串编码，特别是无法通过传递一个
Unicode 码位值来生成多字节编码（像是 UTF-8 或 UTF-16）字符串。
此函数与
ord()
互补。
示例 #3 从单个字节构建 UTF-8 字符串
<?php
$str
=
chr
(
240
) .
chr
(
159
) .
chr
(
144
) .
chr
(
152
);
echo
$str
,
PHP_EOL
;
?>
mailderemi at gmail dot com
¶
14 years ago
Here is a sample of encoding and decoding using "chr" and "ord".
<?php
function
Encode
(
$txtData
,
$Level
){
for (
$j
=
0
;
$j
<
$Level
;
$j
++){
$tmpStr
=
''
;
for (
$i
=
0
;
$i
<
strlen
(
$txtData
);
$i
++)
$tmpStr
.=
ord
(
substr
(
strtoupper
(
$txtData
),
$i
,
1
));
$txtData
=
$tmpStr
;
}
return (
strlen
(
$Level
)).
$Level
.
$txtData
;
}
function
Decode
(
$txtData
){
$intLevel
=
substr
(
$txtData
,
1
,
substr
(
$txtData
,
0
,
1
));
$startStr
=
substr
(
$txtData
,
substr
(
$txtData
,
0
,
1
)+
1
,
strlen
(
$txtData
));
for (
$j
=
0
;
$j
<
$intLevel
;
$j
++){
for (
$i
=
0
;
$i
<
strlen
(
$startStr
);
$i
+=
2
)
$tmpStr
.=
chr
(
intval
(
substr
(
$startStr
,
$i
,
2
)));
$startStr
=
$tmpStr
;
$tmpStr
=
""
;
}
return
$startStr
;
}
echo
Encode
(
'123'
,
4
).
'<br>'
;
echo
Decode
(
Encode
(
'123'
,
5
));
?>
grey - greywyvern - com
¶
20 years ago
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: 中文"
;
$str
=
preg_replace
(
"/&#(\d{2,5});/e"
,
"unichr($1);"
,
$str
);
?>
joeldegan AT yahoo.com
¶
22 years ago
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");
?>
synnus at gmail dot com
¶
10 years ago
// rivencodec 1.0
// encode riverse ascii 1 simple function can encode/decode
// can use it for secure source with speed encode text
<?php
function
rivencodec
(
$ch
,
$a
=
0
) {
while((@
$b
=
$ch
[
$a
++])) {
$ch
[
$a
-
1
] =
chr
(
255
-
ord
(
$b
)); }
return
$ch
;
}
$zz
=
rivencodec
(
"abcdefghijklmn"
);
echo
'encode: '
,
$zz
,
'<br/>'
,
PHP_EOL
;
$yy
=
rivencodec
(
$zz
);
echo
'decode: '
,
$yy
,
'<br/>'
,
PHP_EOL
;
?>
Josh B.
¶
17 years ago
In addition to replacing Microsoft Windows smart quotes, as sgaston demonstrated on 2006-02-13, I replace all other Microsoft Windows characters using suggestions[1] published by character code specialist[2] Jukka Korpela.
<?php
$str
=
str_replace
(
chr
(
130
),
','
,
$str
);
$str
=
str_replace
(
chr
(
131
),
'NLG'
,
$str
);
$str
=
str_replace
(
chr
(
132
),
'"'
,
$str
);
$str
=
str_replace
(
chr
(
133
),
'...'
,
$str
);
$str
=
str_replace
(
chr
(
134
),
'**'
,
$str
);
$str
=
str_replace
(
chr
(
135
),
'***'
,
$str
);
$str
=
str_replace
(
chr
(
136
),
'^'
,
$str
);
$str
=
str_replace
(
chr
(
137
),
'o/oo'
,
$str
);
$str
=
str_replace
(
chr
(
138
),
'Sh'
,
$str
);
$str
=
str_replace
(
chr
(
139
),
'<'
,
$str
);
$str
=
str_replace
(
chr
(
140
),
'OE'
,
$str
);
$str
=
str_replace
(
chr
(
145
),
"'"
,
$str
);
$str
=
str_replace
(
chr
(
146
),
"'"
,
$str
);
$str
=
str_replace
(
chr
(
147
),
'"'
,
$str
);
$str
=
str_replace
(
chr
(
148
),
'"'
,
$str
);
$str
=
str_replace
(
chr
(
149
),
'-'
,
$str
);
$str
=
str_replace
(
chr
(
150
),
'-'
,
$str
);
$str
=
str_replace
(
chr
(
151
),
'--'
,
$str
);
$str
=
str_replace
(
chr
(
152
),
'~'
,
$str
);
$str
=
str_replace
(
chr
(
153
),
'(TM)'
,
$str
);
$str
=
str_replace
(
chr
(
154
),
'sh'
,
$str
);
$str
=
str_replace
(
chr
(
155
),
'>'
,
$str
);
$str
=
str_replace
(
chr
(
156
),
'oe'
,
$str
);
$str
=
str_replace
(
chr
(
159
),
'Y'
,
$str
);
?>
[1] On the use of some MS Windows characters in HTML
http://www.cs.tut.fi/~jkorpela/www/windows-chars.html
[2] Unicode Explained by Jukka Korpela
http://www.amazon.com/dp/059610121X/
tenyou at gmail dot com
¶
21 years ago
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
;
}
?>
scott at quinlan dot co dot nz
¶
16 years ago
Secure password generator with a variable maximum amount of symbols.
<?php
function
passwdGen
(
$minLength
=
8
,
$maxLength
=
12
,
$maxSymbols
=
2
)
{
$symbolCount
=
0
;
srand
((double)
microtime
() *
1000003
);
for (
$i
=
0
;
$i
<
rand
(
$minLength
,
$maxLength
);
$i
++)
{
do
{
$char
=
rand
(
33
,
126
);
$symbolCount
+=
$isSymbol
= (!
in_array
(
$char
,
range
(
48
,
57
)) && !
in_array
(
$char
,
range
(
65
,
90
)) && !
in_array
(
$char
,
range
(
97
,
122
)));
if (
$symbolCount
<=
$maxSymbols
|| !
$isSymbol
)
{
break;
}
}
while (
true
);
$passwd
=
sprintf
(
'%s%c'
, isset(
$passwd
) ?
$passwd
:
NULL
,
$char
);
}
return
$passwd
;
}
?>
happyevil(at)1218.org
¶
24 years ago
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
vitkorob
¶
9 years ago
Another quick function to get unicode char by its code.
<?php
function
unichr
(
$dec
)
{
if (
$dec
<
0x80
)
{
$utf
=
chr
(
$dec
);
}
else if (
$dec
<
0x0800
)
{
$utf
=
chr
(
0xC0
+ (
$dec
>>
6
));
$utf
.=
chr
(
0x80
+ (
$dec
&
0x3f
));
}
else if (
$dec
<
0x010000
)
{
$utf
=
chr
(
0xE0
+ (
$dec
>>
12
));
$utf
.=
chr
(
0x80
+ ((
$dec
>>
6
) &
0x3f
));
$utf
.=
chr
(
0x80
+ (
$dec
&
0x3f
));
}
else if (
$dec
<
0x200000
)
{
$utf
=
chr
(
0xF0
+ (
$dec
>>
18
));
$utf
.=
chr
(
0x80
+ ((
$dec
>>
12
) &
0x3f
));
$utf
.=
chr
(
0x80
+ ((
$dec
>>
6
) &
0x3f
));
$utf
.=
chr
(
0x80
+ (
$dec
&
0x3f
));
}
else
{
die(
"UTF-8 character size is more than 4 bytes"
);
}
return
$utf
;
}
echo
unichr
(
0x263A
);
?>
Kristin
¶
22 years ago
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. :)
ddawsonNOSPAM at execpc dot com
¶
25 years ago
[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.
[email protected]]
Learn from my mistake:
Do not expect this to work!
<?php
$c_question
=
chr
(
63
);
$v_out
=
sprintf
(
"<%cphp\n"
,
$c_question
);
$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.
darkodemon at gmail dot com
¶
18 years ago
chr() with unicode support
<?php
function
uchr
(
$codes
) {
if (
is_scalar
(
$codes
))
$codes
=
func_get_args
();
$str
=
''
;
foreach (
$codes
as
$code
)
$str
.=
html_entity_decode
(
'&#'
.
$code
.
';'
,
ENT_NOQUOTES
,
'UTF-8'
);
return
$str
;
}
echo
uchr
(
23383
); echo
'<br/>'
;
echo
uchr
(
23383
,
215
,
23383
); echo
'<br/>'
;
echo
uchr
(array(
23383
,
215
,
23383
,
215
,
23383
)); echo
'<br/>'
;
?>
ibaid at mail dot ru
¶
7 years ago
string mb_chr ( int $cp [, string $encoding ] )
Parameter List:
cp - character code (in decimal notation)
encoding - encoding (UTF-8, ASCII and so on)
We get the letter 'Ж' from the encoding UTF-8:
$sim = mb_chr(0x0416, 'UTF-8');
echo $sim; // Ж
Get the character '}' from the encoding ASCII:
$sim = mb_chr(125, 'ASCII');
echo $sim ; // }
gfour
¶
6 years ago
I was looking for a simple method to construct excel like column identifiers e.g: A B .... AA AB AC etc, using chr() and modulo, but there is magic...
https://www.php.net/manual/en/language.operators.increment.php
So, this also works
<?php
$p
=
chr
(
65
);
for (
$i
=
1
;
$i
<
53
;
$i
++){
echo
$p
++ .
" - "
;
if (
$i
%
10
==
0
) echo
'</br>'
;
}
?>
Gives
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 - AA - AB - AC - AD -
AE - AF - AG - AH - AI - AJ - AK - AL - AM - AN -
AO - AP - AQ - AR - AS - AT - AU - AV - AW - AX -
AY - AZ -
sinfocol at sinfocol dot org
¶
16 years ago
The function chr() also accepts negative numbers as an ascii code, so chr(-number) is equal to chr((number%256)+256).
And for ascii code higher than 255 is chr(number%256)
We can test with a little script
<?php
for(
$i
=-
300
;
$i
<
300
;
$i
++){
echo
"Ascii
$i
\t"
.
ord
(
chr
(
$i
)) .
"\n"
;
}
?>
