How to solve invalid and extra newlines in PHP strings

Invalid newline character:

Example:

The above problem Mainly because in PHPsingle quotesanddouble quotescan 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:

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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