Description:
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From manual page: http://www.php.net/function.setlocale#refsect1-function.setlocale-parameters
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The english documentation for the parameter "locale" of "setlocale" is :

 If locale is "0", the locale setting is not affected, only the current setting is returned.

But in french, it's :

 Si locale vaut NULL ou vaut "0", la configuration locale ne sera pas modifiée, et la configuration courante sera retournée.

So french documentation say the parameter local can be set to NULL to fetch curent configuration, this is wrong, only "0" will return current configuration, so the english version is right.

Test script:
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wget -qO- http://www.php.net/manual/fr/function.setlocale.php | grep -q ' Si <em><code class="parameter">locale</code></em> vaut <strong><code>NULL</code></strong> ou vaut <em>&quot;0&quot;</em>' && echo Failed || echo Success


Expected result:
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Si locale vaut "0", la configuration locale ne sera pas modifiée, et la configuration courante sera retournée. 

Actual result:
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Si locale vaut NULL ou vaut "0", la configuration locale ne sera pas modifiée, et la configuration courante sera retournée.