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SQL Server Field Name Truncated after 30 Characters

This is due to the older SQL SERVER 6.x driver used.

On  It states:
On Windows, the DBLIB from Microsoft is used. Functions that return a column name are based on the dbcolname() function in DBLIB. DBLIB was developed for SQL Server 6.x where the max identifier length is 30. For this reason, the maximum column length is 30 characters. On platforms where FreeTDS is used (Linux), this is not a problem.

Please switch to the new MSSQL driver for PHP from that would support modern SQL Server. 

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