How Can I Efficiently Replace Different Newline Styles in PHP?

Replacing Different Newline Styles in PHP Efficiently

To replace various newline styles, such as rn, n, and r, with a uniform style (e.g., rn), the following approach is recommended:

$string = preg_replace('~\R~u', "\r\n", $string);

This utilizes PHP's PREG library to search for and replace Unicode newline sequences. The R expression matches any newline sequence in the input string. The u modifier specifies that the string should be treated as UTF-8.

If you prefer to match only carriage return (CR), linefeed (LF), or carriage return followed by linefeed (CRLF) sequences, use this line instead:

$string = preg_replace('~(*BSR_ANYCRLF)\R~', "\r\n", $string);

The following key points are worth noting:

• R matches Unicode newline sequences, including CR, LF, CRLF, and others, by default.
• (*BSR_ANYCRLF) restricts R to match only CR, LF, or CRLF sequences.
• ~ delimiters (Perl-style regular expressions) are used to specify the pattern.

These approaches provide a concise and efficient solution for replacing different newline styles in PHP, improving code performance and readability.

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