Questions about carriage return when PHP writes to a text file

Questions about Enter when PHP writes to a text file

Today, when writing a log file, it is found that the content written is not wrapped. Some information was found to find some problems.

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The relevant code is as follows:

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File_put_contents ($_session[' projectname '), ' balance sheet written successfully \ r \ n ', file_append);

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Or

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$fp = fopen (' Log.txt ', ' a '); Fwrite ($fp, ' balance sheet Write success \r\ntest '); fclose ($FP);

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The code is not a problem, but after writing the file, \ r \ n will output directly instead of the carriage return.

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But Windows under \ r \ n really represents a carriage return, and there is no error, depressed for a good while,

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Later, I changed the quotation marks enclosed in strings from single quotes to double quotes, and everything was OK.

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Seemingly small differences, but the results are unexpected.

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Although it is unclear what the reason is, but still record

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