如何在/中更改/到\ /？

Question

I want to replace all forward slashes / in my URL with \/.

For example, this URL

 http://media3.giphy.com/media/8etoa2PC4Mgx2/200w.mp4 

should be changed to

http:\/\/media3.giphy.com\/media\/8etoa2PC4Mgx2\/200w.mp4

I have tried to do this with this code:

<?php
    $filename="http://media3.giphy.com/media/8etoa2PC4Mgx2/200w.mp4"
    $filename=str_replace("\//","\/","$filename");
    echo $filename:
?>

but it is not working. How can I do this?

Answer 1

$filename = str_replace( "/", "\/", $filename );

Do not wrap$filename in quotes, because it's a variable. If you remove the quotes in third str_replace parameter, it should works.

Edit: You need to escape backslash ( \ ) only, because it has special meaning in PHP.

To specify a literal single quote, escape it with a backslash (). To specify a literal backslash, double it (\). All other instances of backslash will be treated as a literal backslash: this means that the other escape sequences you might be used to, such as or , will be output literally as specified rather than having any special meaning.