7.5. Opt_Compiler_Class class
7.5.19. isFunction()
7.5.18. isComponent()
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7.5.20. isIdentifier()
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7.5.19. isFunction()

Referencestring isFunction(string $name)

Checks, whether the $name represents a function name that is allowed to be used in the templates (this means - is it registered or not). It returns its original PHP name or null, if the class is not registered in the parser.

7.5.19. isFunction()
7.5. Opt_Compiler_Class class
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7.5.18. isComponent()
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7.5.20. isIdentifier()