显示html代码的函数
php函数htmlspecialchars()
<?php $html = htmlspecialchars("<a href='text'>test</a>"); echo $html;?>
nl2br()
把'\n'换行用<br/>or<br>代替插入内容
example:
<?php echo nl2br("an apple is red \n you agree with me"); //an apple is red<br/>you agree with me?>
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