connect string in php code example

Example 1: how to combine variables and text into a string php

<?php
$number = 8;
$txt = "the number is".$number.", ok?"; //Use a dot to combine
echo $txt;
?>

Example 2: how to increment a number after concatinating it with a date function in php

$idArray = [];
array_push($idArray,generateId($idArray));