Question

I have a string and I want to control the content of the string it
contain ( CR, LF or CRLF)or not?

 if (no CR, LF or CF or LF) in string: 
    echo 'no sepator';
  else:
     echo 'have some separator';

Anyone here could tell me the ways to do this in php

Answer 1

this function checks that input string has any combination of new line characters, or not.

function hasNewLine($str) {
    $found = false;
    foreach (array("\r", "\n", "\r\n", "\n\r") as $token) {
        if (strpos($str, $token) !== false) {
            $found = true;
            break;
        }
    }
    return $found;
}

and there’s another version of this function which detects the given string ends with new line characters:

function endsWithNewLine($str) {
    $found = false;
    foreach (array("\r", "\n", "\r\n", "\n\r") as $token) {
        $desiredPos = strlen($str) - strlen($token);
        if (strpos($str, $token) === $desiredPos) {
            $found = true;
            break;
        }
    }
    return $found;
}