[ExpressionLanguage] added some documentation about functions
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@ -92,6 +92,18 @@ class ExpressionLanguage
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/**
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/**
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* Registers a function.
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* Registers a function.
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*
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*
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* A function is defined by two PHP callables. The callables are used
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* by the language to compile and/or evaluate the function.
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*
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* The first function is used at compilation time and must return a
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* PHP representation of the function call (it receives the function
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* arguments as arguments).
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*
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* The second function is used for expression evaluation and must return
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* the value of the function call based on the values defined for the
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* expression (it receives the values as a first argument and the function
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* arguments as remaining arguments).
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*
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* @param string $name The function name
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* @param string $name The function name
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* @param callable $compiler A callable able to compile the function
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* @param callable $compiler A callable able to compile the function
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* @param callable $evaluator A callable able to evaluate the function
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* @param callable $evaluator A callable able to evaluate the function
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