Difference B/w is_null Empty and isset
Note:: empty($name) or $name=="" same
Note: In php NULL IS NOT EQUAL TO BLANK
NOTE:: In php BLANK = = EMPTY == '' OR ""
empty() : blank is not allowed isset() True $name="";
is_null() : varible is defined with value NULL $name=NULL isset() True
isset() : varible is defined
isset > empty() >is_null
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