How to replace br tag in php

How to replace the br tag in php: First create a PHP sample file; then replace the br tag with "\r\n" through the regular method, and the statement is "preg_replace("/
/i", "\r\n",$str);". \s*\>

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PHP Regular Replacement"br /> ;" Tag

regular replacement
is "\r\n"

$str =  "1234567<br />1234567<br />1234567";
 
echo preg_replace("/<br\s*\/?>/i","\r\n",$str);

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