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What is __( in php

Posted on 2010-09-09
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I saw this on a php script, what does that mean (two underscores) ?

__('Read the rest of this page')

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Question by:sahanz
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8 Comments
 
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Expert Comment

by:kumaranmca
ID: 33643417
Greetings sahanz,


__ its magic methods..

Refer the below url...its main future of PHP5

http://php.net/manual/en/language.oop5.magic.php

more methods availbale..like __call, __get...
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jchook earned 1000 total points
ID: 33643704
__('This is used for internationalization in WordPress');

Internationalization (abbreviated i18n (see http://en.wikipedia.org/wiki/Internationalization_and_localization)) is a way of providing translations for the text on a website or other software.

Developers wrap all of the various chunks of text for a website or application in the simple function __. Then, translators can create language files that literally map specific phrases from one human language to another.

So, for example, if your website code has __('The Example'); written somewhere, and the language flag is set to French, the page will display 'L'exemple' instead of 'The Example', so long as there is a French language file that correctly connects the two.


However, this may not always be the case.

In PHP, you can define the function __ to do anything you want. For example:

function __($a) {
  return strrev($a);
}

The function above will reverse any string.

print __('hello'); // outputs olleh
print __('racecar'); // outputs racecar


The short answer is: It is entirely based on context.
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Expert Comment

by:Dushyant Sharma
ID: 33643984
PHP automatically creates variable and assigns values to it even is the variables are not defined. But in Object Oriented Programming all the data members/methods needs to be defined.

Magic methods are used to solve this problem. PHP reserves all function names starting with __ as magical.

These methods for overloading purpose. Please refer http://php.net/manual/en/language.oop5.overloading.php
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Expert Comment

by:Lukasz Chmielewski
ID: 33645591
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Assisted Solution

by:Ray Paseur
Ray Paseur earned 1000 total points
ID: 33653052
Double underscores are reserved by PHP, and apparently used in a quirky (possibly conflicting and dangerous) way in WordPress.

Single underscores get used in Drupal.

So the executive summary is, if you have PHP don't name anything starting with a double underscore.  And if you have a CMS don't name anything starting with an underscore.
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Author Comment

by:sahanz
ID: 33680682
Btw this is not a magic method right?
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Expert Comment

by:Ray Paseur
ID: 33681189
Please see this page:
http://php.net/manual/en/language.oop5.magic.php

HTH, ~Ray
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Author Closing Comment

by:sahanz
ID: 33681250
Thank You
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