Three ways to remove line breaks in PHP

//php Line breaks in different systems
//The implementation of line breaks is different between different systems
///n is used in linux and unix
//MAC uses /r
//window In order to reflect Different from Linux, it is /r/n
  //So the implementation methods are different on different platforms
  //It will be a lot of trouble to use the program you write to run on different platforms
  //There are three methods in php To solve
  //1. Use str_replace to replace newlines
  $str = str_replace(array("/r/n", "/r", "/n"), "", $str);
  //2. Use regular replacement
  $str = preg_replace('//s*/', '', $str);
  //3. Use variables defined by php (recommended)
  PHP_EOL
  Directly following the statement to be newlined That’s it;

Here we have to re-look at the variables that have been defined in PHP
PHP_EOL is one of them, representing the newline character of PHP. This variable will change according to the platform. Under Windows, it will be /r/n. It is /n under linux and /r under mac
$str = str_replace(PHP_EOL, '', $str);