1. htmlspecialchars() 函数把一些预定义的字符转换为 HTML 实体
函数原型：htmlspecialchars(string,quotestyle,character-set)
预定义的字符是：
& （和号） 成为 &
” （双引号） 成为 "
‘ （单引号） 成为 '
< （小于） 成为 <
> （大于） 成为 >
<?php
$str = "This is some <b>bold</b> text.";
echo htmlspecialchars($str);
?>
以上代码的 HTML 输出如下（查看源代码）：
<!DOCTYPE html>
<html> <body> This is some <b>bold</b> text. </body> </html>
以上代码的浏览器输出：
This is some <b>bold</b> text.
2. htmlspecialchars_decode() 函数把一些预定义的 HTML 实体转换为字符（和htmlspecialchars相反）
函数原型：htmlspecialchars_decode(string,quotestyle)
<?php $str = "This is some <b>bold</b> text."; echo htmlspecialchars_decode($str); ?>
以上代码的 HTML 输出如下（查看源代码）：
<!DOCTYPE html> <html> <body> This is some <b>bold</b> text. </body> </html>
以上代码的浏览器输出：
This is some bold text.
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