php concat

$a = "hello";
$b = "world";
$c = $a . " " . $b;

echo $c; // hello world

<?php 

// First String 
$a = 'Hello'; 

// Second String 
$b = 'World!'; 

// Concatenation Of String 
$c = $a.$b; 

// print Concatenate String 
echo " $c \n"; 
?> 

$string = "the color is ";
$string .= "red";

echo $string; // gives: the color is red

$string3 = $string1 . $string2;

function generateId($existingIds) {
    $currentDate = date('Ymd');

    $id = 1;

    while (in_array($currentDate . sprintf('%02d', $id),$existingIds)) {
        $id++;
    }

    return $currentDate . sprintf('%02d', $id);
}

public function getAvg(string $var) {
  # A sample from a game I wrote.
  # Concatenatin on the other side is just {stuff.$var}
  # You can also concatenate multiple variables in a varaible:
  # {$varA.$varb}
  $min = $this->{$var._min};
  # Assigns to $min object property matching $var + '_min' string.
  $max = $this->{$var._max};
  # Assigns to $max object property matching $var + '_max' string.
  $avg = (($min + $max) / 2);
  return round($avg);
}