php highlight_file函数用于对文件进行PHP语法高亮显示。语法通过使用 HTML 标签进行高亮，其语法是highlight_file(filename,return)，参数filename必需，指规定要显示的文件。
php highlight_file函数怎么用？
定义和用法
highlight_file() 函数对文件进行 PHP 语法高亮显示。语法通过使用 HTML 标签进行高亮。
提示：用于高亮的颜色可通过 php.ini 文件进行设置或者通过调用 ini_set() 函数进行设置。
注释：当使用该函数时，整个文件都将被显示，包括密码和其他敏感信息！
语法
highlight_file(filename,return)
参数
filename 必需。规定要显示的文件。
return 可选。如果该参数设置为 TRUE，该函数将以字符串形式返回高亮显示的代码，而不是直接进行输出。默认是 FALSE。
返回值：
如果 return 参数设置为 TRUE，该函数将以字符串形式返回高亮显示的代码，而不是直接进行输出。否则，如果成功则返回 TRUE，如果失败则返回 FALSE。
PHP 版本： 4+
更新日志： 自 PHP 4.2.1 起，该函数现在也受 safe_mode 和 open_basedir 影响。然而，在 PHP 5.4 中 safe_mode 被移除。
在 PHP 4.2.0 中新增了 return 参数。
对测试文件（"test.php"）进行 PHP 语法高亮显示：
<html>
<body>
<?php
highlight_file("test.php");
?>
</body>
</html>上面代码的浏览器输出如下（取决于文件中的内容）：
<html>
<body>
<?php
echo ("test.php");
?>
</body>
</html>上面代码的 HTML 输出如下（查看源代码）：
<html> <body> <code><span style="color: #000000"> <html> <br /><body> <br /><span style="color: #0000BB"><?php <br /></span><span style="color: #007700">echo (</span><span style="color: #DD0000">"test.php"</span><span style="color: #007700">); <br /></span><span style="color: #0000BB">?> <br /></span></body> <br /></html></span> </code> </body> </html>
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