How to output backslash in php

According to the conventional writing method, if we want to output a backslash, then we can directly write the backslash symbol in the output string, but is this okay? Let's try it anyway. (Recommended learning: PHP programming from entry to proficiency)

When running the page of this code, I found that the page reported an error, and the error was a syntax error.

Why is this? We can see from the php document that this backslash has a special meaning in the string. It is actually an escape character.

So if we want to output this backslash, we need to add another backslash. The first backslash is for escaping, and the second one is for escaping. A backslash is the actual output string.

#Run the above code again, you can see that no error is reported, and the backslash character can be output correctly.

What if you want to output two backslash characters? We just need to write four backslash symbols. In short, they must be in pairs.

You can know by running the page that two backslash symbols are successfully output.

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