How to replace carriage return with br using PHP

When displaying text content on a web page, it is often necessary to replace the carriage return and line feed character (\n) in the text content with the line feed character (br) in HTML to display it correctly. In PHP, we can use some simple functions to achieve such replacement.

1. Use PHP’s built-in nl2br() function

nl2br() function is PHP’s built-in function, which can replace the carriage return (\n) in any string Replaced by newline character (br) in HTML. The specific usage method is as follows:

$string = "这里有一个\n换行符"; $string = nl2br($string); echo $string;

The output result after execution is:

这里有一个
换行符

2. Use the str_replace() function in PHP

In addition to the built-in nl2br () function, we can also use the str_replace() function in PHP to perform replacement. The specific usage method is as follows:

$string = "这里有一个\n换行符"; $string = str_replace("\n", "
", $string); echo $string;

The output result after execution is the same as the above method:

这里有一个
换行符

It should be noted that the str_replace() function also supports the replacement of multiple different strings. All strings that need to be replaced can be passed into the function as an array.

3. Use regular expressions

If you need to perform more complex replacement operations, you can use regular expressions to match and replace. For example, we can replace all carriage returns and line feeds with line breaks in HTML through the following code:

$string = preg_replace("/\r|\n/", "
", $string);

It should be noted that when using regular expressions, pay special attention to each character in the expression. Special characters to ensure that they can correctly match the string that needs to be replaced.

To sum up, the above three methods can all replace the carriage return character (\n) in the string with the HTML line feed character (br). Just choose the corresponding method according to actual needs.

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