create CRC32 checksum(a,b,c)
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     Group  | 
                
This function calculates a CRC32 checksum for the string a.
Parameter Description
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     Parameter  | 
                
     Description  | 
        
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     a  | 
                
     Text for which the checksum is to be generated.  | 
        
| 
     b  | 
                
     (optional) Encoding to use for reading a. Default: ISO-8859-1  | 
        
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     c  | 
                
     (optional) If true, the result value is generated as a hexadecimal value, otherwise as a long value. Default: false.  | 
        
Examples
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     Parameter a  | 
                
     Parameter b  | 
                
     Parameter c  | 
                
     Result  | 
        
| 
     Hello world  | 
                
     | 
                
     2346098258  | 
        |
| 
     Hello world  | 
                
     | 
                
     true  | 
                
     8bd69e52  |