php - file_put_contents包含&符号的时候执行失败怎么破?

Question

这样子执行成功：
<?php
$filename="test.txt";
file_put_contents($filename, "nihao");
?>

但这样会失败：
<?php
$filename="test.txt";
file_put_contents($filename, "ni&hao");
?>

求指点，只是多了一个and符号，请问这样要怎么处理？

Answer 1

"ni&hao" Add the escape character '&' before special characters or change the double quotes to single quotes.

Answer 2

Is it possible? I have tested both methods and both are fine.

Answer 3

<?php
$filename="test.txt";
file_put_contents($filename, json_encode("ni&hao"));
?>