How to insert variable in php snippet?

Question

Snippets

How to insert a variable in php snippet, for example, $value?
Here is the snippet code:
foreach ( ${1:this} as ${2:value}) {
${3:this}
}
and here is the result:
foreach ( this as value) {
this
}
and you need:
foreach ( this as $value ) {
this
},
that is, the dollar sign is not substituted.

Answer 1

Need to escape \