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The PHP’s crc32 support string as input.And For a file , below code will work OFC.
crc32(file_get_contents("myfile.CSV"));
But if file goes huge (2 GB) it might raise out of memory Fatal error.
So any way around to find checksum of huge files ?
This function in the User Contributed Notes to
crc32()claims to calculate the value without loading the file in full. If it works correctly, it should eliminate any memory problems.For a file larger than 2 GB, it is however likely to stop at the same 32-bit limitation you are encountering right now.
If possible, I would invoke an external tool that can calculate the checksum for files as large as the one at hand.