PHP，怎样解析内含php命令的字符串？

思路是正则匹配到<?php ?>标签,将里面的具体代码通过eval执行,然后前后的字符串输出,再返回

例如:

<?php

session_start()

$_SESSION['age'] = 18

function initStr($str) {

$pattern = '/^(.*)\<\?php(.*)\?\>(.*)$/isU'

<a href="https://www.baidu.com/s?wd=preg_match&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLuj01PjN-nW6YuH0YP1uB0AP8IA3qPjfsn1bkrjKxmLKz0ZNzUjdCIZwsrBtEXh9GuA7EQhF9pywdQhPEUiqkIyN1IA-EUBtYPHf3PWfLnHmkn1nYnWndnWR" target="_blank" class="baidu-highlight">preg_match</a>($pattern, $str, $match)

ob_start()

echo $match[1]

eval($match[2])

echo $match[3]

$return = ob_get_contents()

ob_end_clean()

return $return

}

$ori_str = 'My age is <?php echo $_SESSION["age"]?>, how about you?'

$str = initStr($ori_str)

echo $str

?>

<?php

$content="111\n222"

//先替换

$contents=str_replace("\n","<br/>",$content)

//再输出即可解决

echo $contents

?>

输出结果为：

111

222

---