How to detect if a string has a new line break in it?

Question

This doesn\'t work:

$string = \'Hello
    world\';

if(strpos($string, \'\\n\')) {
    echo \'New line break found\';
}
else {
    echo \'not found\';
}
<         


        

Answer 1

The most reliable way to detect new line in the text that may come from different operating systems is:

preg_match('/\R/', $string)

\R comes from PCRE and it is the same as: (?>\r\n|\n|\r|\f|\x0b|\x85|\x{2028}|\x{2029})

The suggested answer to check PHP_EOL

if(strstr($string, PHP_EOL)) {

will not work if you are for example on Windows sytem and checking file created in Unix system.