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setlocale(LC_ALL,'sv_SE.ISO-8859-1');

On Windows, to change the locale, visit the Control Panel. In the Regional Options section, you

can pick a new locale and customize its settings.

16.3.4 See Also

Section 16.4

shows how to set a default locale; documentation on

setlocale( )

http://www.php.net/setlocale

Recipe 16.4 Setting the Default Locale

16.4.1 Problem

You want to set a locale that all your PHP programs can use.

16.4.2 Solution

At the beginning of a file loaded by the

auto_prepend_file

configuration directive, call

setlocale( )

to set your desired locale:

setlocale(LC_ALL,'es_US');

16.4.3 Discussion

Even if you set up appropriate environment variables before you start your web server or PHP

binary, PHP doesn't change its locale until you call

setlocale( )

. After setting environment

variable

LC_ALL

es_US

, for example, PHP still runs in the default C locale.

16.4.4 See Also

Section 16.3

shows how to use a particular locale; documentation on

setlocale( )

http://www.php.net/setlocale

and

auto_prepend_file

http://www.php.net/manual/en/configuration.directives.php#ini.auto-prepend-file

Recipe 16.5 Localizing Text Messages

16.5.1 Problem

You want to display text messages in a locale-appropriate language.

16.5.2 Solution

Maintain a message catalog of words and phrases and retrieve the appropriate string from the

message catalog before printing it. Here's a simple message catalog with some foods in

American and British English and a function to retrieve words from the catalog:

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$messages = array ('en_US' =>

array(

'My favorite foods are' => 'My favorite foods are',

'french fries' => 'french fries',

'biscuit' => 'biscuit',

'candy' => 'candy',

'potato chips' => 'potato chips',

'cookie' => 'cookie',

'corn' => 'corn',

'eggplant' => 'eggplant'

'en_GB' =>

array(

'My favorite foods are' => 'My favourite foods are',

'french fries' => 'chips',

'biscuit' => 'scone',

'candy' => 'sweets',

'potato chips' => 'crisps',

'cookie' => 'biscuit',

'corn' => 'maize',

'eggplant' => 'aubergine'

)

);

function msg($s) {

global $LANG;

global $messages;

if (isset($messages[$LANG][$s])) {

return $messages[$LANG][$s];

} else {

error_log("l10n error: LANG: $lang, message: '$s'");

}

16.5.3 Discussion

This short program uses the message catalog to print out a list of foods:

$LANG = 'en_GB';

print msg('My favorite foods are').":\n";

print msg('french fries')."\n";

print msg('potato chips')."\n";

print msg('corn')."\n";

print msg('candy')."\n";

My favourite foods are:

chips

crisps

maize

sweets

To have the program output in American English instead of British English, just set

$LANG

en_US

You can combine the

msg( )

message retrieval function with

sprintf( )

to store phrases

that require values to be substituted into them. For example, consider the English sentence "I

am 12 years old." In Spanish, the corresponding phrase is "Tengo 12 años." The Spanish

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phrase can't be built by stitching together translations of "I am," the numeral 12, and "years

old." Instead, store them in the message catalogs as

sprintf( )

-style format strings:

$messages = array ('en_US' => array('I am X years old.' => 'I am %d years

old.'),

'es_US' => array('I am X years old.' => 'Tengo %d

años.')

);

You can then pass the results of

msg( )

sprintf( )

as a format string:

$LANG = 'es_US';

print sprintf(msg('I am X years old.'),12);

Tengo 12 años.

For phrases that require the substituted values to be in a different order in different language,

sprintf( )

supports changing the order of the arguments:

$messages = array ('en_US' =>

array('I am X years and Y months old.' =>

'I am %d years and %d months old.'),

'es_US' =>

array('I am X years and Y months old.' =>

'Tengo %2$d meses y %1$d años.')

);

With either language, call

sprintf( )

with the same order of arguments (i.e., first years,

then months):

$LANG = 'es_US';

print sprintf(msg('I am X years and Y months old.'),12,7);

Tengo 7 meses y 12 años.

In the format string,

%2$

tells

sprintf( )

to use the second argument, and

%1$

tells it to

use the first.

These phrases can also be stored as a function's return value instead of as a string in an

array. Storing the phrases as functions removes the need to use

sprintf( )

. Functions that

return a sentence look like this:

// English version

function i_am_X_years_old($age) {

return "I am $age years old.";

}

// Spanish version

function i_am_X_years_old($age) {

return "Tengo $age años.";

}

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If some parts of the message catalog belong in an array, and some parts belong in functions,

an object is a helpful container for a language's message catalog. A base object and two

simple message catalogs look like this:

class pc_MC_Base {

var $messages;

var $lang;

function msg($s) {

if (isset($this->messages[$s])) {

return $this->messages[$s];

} else {

error_log("l10n error: LANG: $this->lang, message: '$s'");

}

class pc_MC_es_US extends pc_MC_Base {

function pc_MC_es_US() {

$this->lang = 'es_US';

$this->messages = array ('chicken' => 'pollo',

'cow' => 'vaca',

'horse' => 'caballo'

);

}

function i_am_X_years_old($age) {

return "Tengo $age años";

}

class pc_MC_en_US extends pc_MC_Base {

function pc_MC_en_US() {

$this->lang = 'en_US';

$this->messages = array ('chicken' => 'chicken',

'cow' => 'cow',

'horse' => 'horse'

);

}

function i_am_X_years_old($age) {

return "I am $age years old.";

}

Each message catalog object extends the

pc_MC_Base

class to get the

msg( )

method, and

then defines its own messages (in its constructor) and its own functions that return phrases.

Here's how to print text in Spanish:

$MC = new pc_MC_es_US;

print $MC->msg('cow');

print $MC->i_am_X_years_old(15);

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To print the same text in English,

$MC

just needs to be instantiated as a

pc_MC_en_US

object

instead of a

pc_MC_es_US

object. The rest of the code remains unchanged.

16.5.4 See Also

The introduction to Chapter 7

discusses object inheritance; documentation on

sprintf( )

http://www.php.net/sprintf

Recipe 16.6 Localizing Dates and Times

16.6.1 Problem

You want to display dates and times in a locale-specific manner.

16.6.2 Solution

Use

strftime( )

format string:

print strftime('%c');

You can also store

strftime( )

format strings as messages in your message catalog:

$MC = new pc_MC_es_US;

print strftime($MC->msg('%Y-%m-%d'));

16.6.3 Discussion

The

format string tells

strftime( )

to return the preferred date and time representation

for the current locale. Here's the quickest way to a locale-appropriate formatted time string:

print strftime('%c');

This code produces a variety of results:

Tue Aug 13 18:37:11 2002 // in the default C locale

mar 13 ago 2002 18:37:11 EDT // in the es_US locale

mar 13 aoÛ 2002 18:37:11 EDT // in the fr_FR locale

The formatted time string that

produces, while locale-appropriate, isn't very flexible. If you

just want the time, for example, you must pass a different format string to

strftime( )

. But

these format strings themselves vary in different locales. In some locales, displaying an hour

from 1 to 12 with an A.M./P.M. designation may be appropriate, while in others the hour

should range from 0 to 23. To display appropriate time strings for a locale, add elements to

the locale's

$messages

array for each time format you want. The key for a particular time

format, such as

%H:%M

, is always the same in each locale. The value, however, can vary, such

%H:%M

for 24-hour locales or

%I:%M %P

for 12-hour locales. Then, look up the appropriate

format string and pass it to

strftime( )

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$MC = new pc_MC_es_US;

print strftime($MC->msg('%H:%M'));

Changing the locale doesn't change the time zone, it changes only the formatting of the

displayed result.

16.6.4 See Also

Section 3.5

discusses the format strings that

strftime( )

accepts; Section 3.12

covers

changing time zones in your program; documentation on

strftime( )

http://www.php.net/strftime

Recipe 16.7 Localizing Currency Values

16.7.1 Problem

You want to display currency amounts in a locale-specific format.

16.7.2 Solution

Use the

pc_format_currency( )

function, shown in Example 16-1

, to produce an

appropriately formatted string. For example:

setlocale(LC_ALL,'fr_CA');

print pc_format_currency(-12345678.45);

(12 345 678,45 $)

16.7.3 Discussion

The

pc_format_currency( )

function, shown in Example 16-1

, gets the currency

formatting information from

localeconv( )

and then uses

number_format( )

and some

logic to construct the correct string.

Example 16-1. pc_format_currency

function pc_format_currency($amt) {

// get locale-specific currency formatting information

$a = localeconv();

// compute sign of $amt and then remove it

if ($amt < 0) { $sign = -1; } else { $sign = 1; }

$amt = abs($amt);

// format $amt with appropriate grouping, decimal point, and fractional

digits

$amt = number_format($amt,$a['frac_digits'],$a['mon_decimal_point'],

$a['mon_thousands_sep']);

// figure out where to put the currency symbol and positive or negative

signs

$currency_symbol = $a['currency_symbol'];

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// is $amt >= 0 ?

if (1 == $sign) {

$sign_symbol = 'positive_sign';

$cs_precedes = 'p_cs_precedes';

$sign_posn = 'p_sign_posn';

$sep_by_space = 'p_sep_by_space';

} else {

$sign_symbol = 'negative_sign';

$cs_precedes = 'n_cs_precedes';

$sign_posn = 'n_sign_posn';

$sep_by_space = 'n_sep_by_space';

}

if ($a[$cs_precedes]) {

if (3 == $a[$sign_posn]) {

$currency_symbol = $a[$sign_symbol].$currency_symbol;

} elseif (4 == $a[$sign_posn]) {

$currency_symbol .= $a[$sign_symbol];

}

// currency symbol in front

if ($a[$sep_by_space]) {

$amt = $currency_symbol.' '.$amt;

} else {

$amt = $currency_symbol.$amt;

}

} else {

// currency symbol after amount

if ($a[$sep_by_space]) {

$amt .= ' '.$currency_symbol;

} else {

$amt .= $currency_symbol;

}

if (0 == $a[$sign_posn]) {

$amt = "($amt)";

} elseif (1 == $a[$sign_posn]) {

$amt = $a[$sign_symbol].$amt;

} elseif (2 == $a[$sign_posn]) {

$amt .= $a[$sign_symbol];

}

return $amt;

The code in

pc_format_currency( )

that puts the currency symbol and sign in the correct

place is almost identical for positive and negative amounts; it just uses different elements of

the array returned by

localeconv( )

. The relevant elements of

localeconv( )

's returned

array are shown in Table 16-1

Table 16-1. Currency-related information from localeconv( )

Array element

Description

currency_symbol

Local currency symbol

mon_decimal_point

Monetary decimal point character

mon_thousands_sep

Monetary thousands separator

positive_sign

Sign for positive values

negative_sign

Sign for negative values

frac_digits

Number of fractional digits

p_cs_precedes

1 if

currency_symbol

should precede a positive value, 0 if it should

p_sep_by_space

1 if a space should separate the currency symbol from a positive value,

0 if not

n_cs_precedes

1 if

currency_symbol

should precede a negative value, 0 if it should

n_sep_by_space

1 if a space should separate

currency_symbol

from a negative value,

0 if not

p_sign_posn

Positive sign position:

0if parenthesis should surround the quantity and

currency_symbol

1 if the sign string should precede the quantity and

currency_symbol

2 if the sign string should follow the quantity and

currency_symbol

3 if the sign string should immediately precede

currency_symbol

4 if the sign string should immediately follow

currency_symbol

n_sign_posn

Negative sign position: same possible values as

p_sign_posn

There is a function in the C library called

strfmon( )

that does for currency what

strftime( )

does for dates and times; however, it isn't implemented in PHP. The

pc_format_currency( )

function provides most of the same capabilities.

16.7.4 See Also

Section 2.10

also discusses

number_format( )

; documentation on

localeconv( )

http://www.php.net/localeconv

and

number_format( )

at http://www.php.net/number-

format

Recipe 16.8 Localizing Images

16.8.1 Problem

You want to display images that have text in them and have that text in a locale-appropriate

language.

16.8.2 Solution

Make an image directory for each locale you want to support, as well as a global image

directory for images that have no locale-specific information in them. Create copies of each

locale-specific image in the appropriate locale-specific directory. Make sure that the images

have the same filename in the different directories. Instead of printing out image URLs

directly, use a wrapper function similar to the

msg( )

function in Section 16.5

that prints out

locale-specific text.

16.8.3 Discussion

The

img( )

wrapper function looks for a locale-specific version of an image first, then a global

one. If neither are present, it prints a message to the error log:

$image_base_path = '/usr/local/www/images';

$image_base_url = '/images';

function img($f) {

global $LANG;

global $image_base_path;

global $image_base_url;

if (is_readable("$image_base_path/$LANG/$f")) {

print "$image_base_url/$LANG/$f";

} elseif (is_readable("$image_base_path/global/$f")) {

print "$image_base_url/global/$f";

} else {

error_log("l10n error: LANG: $lang, image: '$f'");

}

This function needs to know both the path to the image file in the filesystem

(

$image_base_path

) and the path to the image from the base URL of your site (/images). It

uses the first to test if the file can be read and the second to construct an appropriate URL for

the image.

A localized image must have the same filename in each localization directory. For example, an

image that says "New!" on a yellow starburst should be called new.gif in both the

images/en_US directory and the images/es_US directory, even though the file

images/es_US/new.gif is a picture of a yellow starburst with "

Nuevo!" on it.

Don't forget that the

alt

text you display in your image tags also needs to be localized. A

complete localized

<img>

tag looks like:

printf('<img src="%s" alt="%s">',img('cancel.png'),msg('Cancel'));

If the localized versions of a particular image have varied dimensions, store image height and

width in the message catalog as well:

printf('<img src="%s" alt="%s" height="%d" width="%d">',

img('cancel.png'),msg('Cancel'),

msg('img-cancel-height'),msg('img-cancel-width'));

The localized messages for

img-cancel-height

and

img-cancel-width

are not text

strings, but integers that describe the dimensions of the cancel.png image in each locale.

16.8.4 See Also

Section 16.5

discusses locale-specific message catalogs.

Recipe 16.9 Localizing Included Files

16.9.1 Problem

You want to include locale-specific files in your pages.

16.9.2 Solution

Dynamically modify the

include_path

once you've determined the appropriate locale:

$base = '/usr/local/php-include';

$LANG = 'en_US';

$include_path = ini_get('include_path');

ini_set('include_path',"$base/$LANG:$base/global:$include_path");

16.9.3 Discussion

The

$base

variable holds the name of the base directory for your included localized files. Files

that are not locale-specific go in the global subdirectory of

$base

, and locale-specific files go

in a subdirectory named after their locale (e.g., en_US). Prepending the locale-specific

directory and then the global directory to the include path makes them the first two places

PHP looks when you include a file. Putting the locale-specific directory first ensures that

nonlocalized information is loaded only if localized information isn't available.

This technique is similar to what the

img( )

function does in the Section 16.8

. Here,

however, you can take advantage of PHP's

include_path

feature to have the directory

searching happen automatically. For maximum utility, reset

include_path

as early as

possible in your code, preferably at the top of a file loaded via

auto_prepend_file

on every

request.

16.9.4 See Also

Documentation on

include_path

http://www.php.net/manual/en/configuration.directives.php#ini.include-path

and

auto_prepend_file

http://www.php.net/manual/en/configuration.directives.php#ini.auto-prepend-file

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