How to solve invalid and extra newlines in PHP strings

Invalid newline character:

Example:

<?php 
    echo &#39;hello\n&#39;; 
    echo &#39;world&#39;; 
?>

The above problem Mainly because in PHP single quotes and double quotes can be expressed, but double quotes also have a special function: the content in the double quote string can be interpreted and replaced. This is What single quotes don’t have.

After modification:

<?php 
    echo "hello\n"; 
    echo &#39;world&#39;; 
?>

Excess newlines:

     
  //php 不同系统的换行       
  //不同系统之间换行的实现是不一样的       
  //linux 与unix中用 /n     
  //MAC 用 /r      
  //window 为了体现与linux不同 则是 /r/n       
  //所以在不同平台上 实现方法就不一样       
  //php 有三种方法来解决

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

      
 $str = str_replace(PHP_EOL, '', $str);

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