php method to replace newline characters in strings: You can use the variable PHP_EOL defined in php to replace, such as [str_replace(PHP_EOL, '', $str);].
You can use the following three methods to solve it:
(Recommended tutorial: php video tutorial)
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)
$str = str_replace(PHP_EOL, '', $str);
Related recommendations : php training
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