What does php use to comment single lines of code?

What does php use to comment a single line of code?

All text around "//" in a line will be Treated as comments, the PHP parser will ignore the code to the right of the line "//" as follows:

<?php
echo "test"； // 这是单行注释
?>

If the first line only writes comments and no code, the content after "//" will also be ignored. will be displayed. The code is as follows:

<?php
//这是单行注释
echo “test”；
//这是单行注释
?>

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