事务管理器要能够容忍不同资源管理器在发生类似错误时返回的不同错误代码而导致的不同行为。
The transaction manager needs to be tolerant to different behaviors due to different error codes returned by different resource managers for similar kinds of failures.
exec() 命令与 shell_exec() 相似，不同之处是它返回输出的最后一行，并且可选地用命令的完整输出和错误代码填充数组。
The exec() command is similar to shell_exec(), except it returns the last line of the output and, optionally, populates an array with the full output of the command, along with the error code.
转换提供者错误代码——不同的服务提供者会使用不同的语义来返回服务错误。
Transform provider error codes - It is possible that different service providers return service errors using different semantics.
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