VS code doesn't see custom snippets, what's wrong?

Question

Visual Studio Code

I wanted to try creating a custom snippet for php. Went into user code snippets, chose php.json. Wrote this code

"php_start": {
    "prefix": "php",
    "body": [
      "<?php $1 ?>"
    ],
    "description": "php code"
  }

But when entering php custom snippet is not in autocompletion

Answer 1

{
"php_start": {
"prefix": "php",
"body": [
"<?php $1 ?>"
],
"description": "php code"
}
Forgot the square brackets at the top