Passing data from PHP/HTML to .vue Component - vue.js

Question

What I'm trying to do is seemingly simple, but I can't seem to figure it out. Basically, I have 2 files:
A PHP file with the following:
...
<user-panel v-if="user.id && loaded" v-bind:user="user" v-bind:name="theUserName"></user-panel>
...
A .Vue component file with the following (that gets compiled into another file):
<template>
<span id="userPanel" class="d-flex align-items-center">
<a href="#" role="button" class="user-dropdown-toggle">
<div class="logged-in d-flex align-items-center">
<span class="d-flex align-items-center justify-contnet-center"></span>
{{name}}
</div>
</a>
</span>
</template>
<script>
export default {
name: "UserPanel",
props: ['user'],
created () {
console.log(this.$refs.myTestField.value)
}
}
</script>
All I'd like to do is pass data from the PHP to Vue into {{name}}. I've tried v-bind, a data-attribute, a hidden input, etc. Any help would be greatly appreciated.

Answer 1

My intention is to transfer data from my .php file to the .js file where the VUE code resides. Here I show you my code. In the proposed example I would like to import a simple string, subsequently I would like to import a JSON. Thank you so much.
File PHP
<div id='app'> <App v-bind:import='Value Import'> C'è QUALCHE PROBLEMA </App> </div>"
File .js
var App = Vue.component("App", {
template: `
<div class="container">
<div>
<h2>{{ titolo }}</h2>
<h3>{{ import }}</h3>
</div>
</div>
`,
props: ['import'],
data() {
return {
color: "color: red",
titolo: "Inizio Container",
};
}
});
new Vue({
el: "#app",
});
Quanto sopra purtroppo non funziona.

Answer 2

Vue single file components are processed on client side.
There are SSR, however, since you have php on your server, you must set up a REST service so you can use fetch or axios to consume server data and present it to the client side.

Answer 3

Let's say you have a php variable that contains string. $phpString
PHP file
...
<my-component v-bind:myProperty="<?php echo $phpString ?>"></my-component>
...
Don't forget to escape $phpString before echoing it.
In your Vue define a property called myProperty:
<template>
<span>
{{ myProperty }}
</span>
</template>
<script>
export default {
props: ['myProperty']
}
</script>