Description:
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---
From manual page: http://www.php.net/function.str-replace#Liste de paramètres
---
The description of the count parameter (in the french documentation page) could 
lead to an understanding mistake.
The French documentation is:
'Si fourni, définira le nombre de remplacements à effectuer.'
It means:
'If passed, this will set the number of replacements to perform.'

To be conform to the English documentation, it should be written:
'Si fournie, cette variable contiendra le nombre de remplacements effectués.' 

You can check the French documentation of the preg_replace function to validate 
this translation