No need to have this protected. Property can be read with method show()
and this method can be override.
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@ -65,7 +65,7 @@ class DolGraph
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var $bgcolorgrid=array(255,255,255); // array(R,G,B)
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var $datacolor; // array(array(R,G,B),...)
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protected $_stringtoshow; // To store string to output graph into HTML page
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private $_stringtoshow; // To store string to output graph into HTML page
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/**
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