将example . php文件加载到文本编辑器，并删除第一行—该行包括facebook . php行。

Load the example.php file into a text editor, and remove the first line-the one that does an include of the facebook.php.

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若要删除文件中的第一行，可以使用以下命令。

To delete the first line in a file.

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也可以按相反方向执行此操作，并删除从该文件的第一行到第一个匹配某模式的行的所有内容。

You can do the inverse and delete everything from the first line of the file until the first line matches some pattern.

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