php函数

htmlspecialchars()

<?php
  
    $html = htmlspecialchars("<a href='text'>test</a>");
    echo $html;
  
?>

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nl2br()

?把'\n'换行用<br/>or<br>代替插入内容

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example:

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<?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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