- array_map: documentation ( source)
- var_dump: documentation ( source)
- explode: documentation ( source)
- join: documentation ( source)
<?php
$str =
"
line 1
line 2
line 3\r
line 4
";
$str_cleared = join("\n", array_map('trim', explode("\n", $str)));
var_dump($str);
var_dump($str_cleared);