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Open any text file and click on the pilcrow (¶) button. Notepad++ will show all of the characters with newline characters in either the CR and LF format. If it is a Windows EOL encoded file, the newline characters of CR LF will appear (\r\n).
PHP_EOL represents the endline character for the current system (eg \n on unixes) however if you are treating strings from a windoes system (\r\n) they won't be rexognised as endlines. PHP_EOL is "The correct 'End Of Line' symbol for this platform".
Create a string containing line breaksInserting a newline code \n , \r\n into a string will result in a line break at that location. On Unix, including Mac, \n (LF) is often used, and on Windows, \r\n (CR + LF) is often used as a newline code.
Your existing test doesn't work because you don't use double-quotes around your line break character ('\n'). Change it to:
if(strstr($string, "\n")) {
Or, if you want cross-operating system compatibility:
if(strstr($string, PHP_EOL)) {
Also note that strpos will return 0 and your statement will evaluate to FALSE if the first character is \n, so strstr is a better choice. Alternatively you could change the strpos usage to:
if(strpos($string, "\n") !== FALSE) {
echo 'New line break found';
}
else {
echo 'not found';
}
line break is \r\n on windows and on UNIX machines it is \n.
so its search for PHP_EOL instead of "\n" for cross-OS compatibility, or search for both "\r\n" and "\n".
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.
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