Preserving the last error code implies a decrease in performance.

保留最后的错误码意味著效能的降低。

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The last thing we need to do is add some error-handling code for uploads larger than 1mb.

最后，我们需要对大于1 MB的上传文件进行错误处理。

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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.

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。

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