In fact, you have to learn to understand. It doesn’t matter whether you understand what you heard at the time. Just roughly understand the meaning. The key is to type according to the code and read the documents at the same time. Then you will slowly understand. In fact, most of the videos on the PHP Chinese website have been very Detailed and straightforward. For the metacharacters you mentioned, you can refer to each syntax and corresponding description of the metacharacters in the manual. You can quickly understand it by reading the manual while watching the video explanation, and then typing the code based on the video examples.
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In fact, you have to learn to understand. It doesn’t matter whether you understand what you heard at the time. Just roughly understand the meaning. The key is to type according to the code and read the documents at the same time. Then you will slowly understand. In fact, most of the videos on the PHP Chinese website have been very Detailed and straightforward. For the metacharacters you mentioned, you can refer to each syntax and corresponding description of the metacharacters in the manual. You can quickly understand it by reading the manual while watching the video explanation, and then typing the code based on the video examples.