删除空的<>

Question

如果< >为空，是否可以删除它？

文本可以是； < > Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, < > when an <b>unknown printer</b> took <> a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries. < >

输出应该是； Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an <b>unknown printer</b> took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries.

Answer 1

您可以使用preg_replace：

$text = "<  > Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, < > when an <b>unknown printer</b> took <> a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries. <     >";
$text = preg_replace('/<\s*\>/', '', $text);
echo $text;

输出：

 Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,  when an <b>unknown printer</b> took  a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries. 

Demo on 3v4l.org

如果您还想清除空<>的行中的任何多个或悬挂的空格（在行的开头或结尾），则可以使用以下代替：

$text = preg_replace(array('/<\s*\>/', '/\s+/', '/^\s|\s$/'), array('', ' ', ''), $text);

Demo on 3v4l.org