ImplicitToStringCast

An object that does not implement __toString() or Stringable is implicitly coerced to a string (e.g. in string concatenation or an interpolated string).

Example

<?php
class Point {
    public function __construct(public int $x, public int $y) {}
}

$p = new Point(1, 2);
echo "Position: " . $p; // Point has no __toString

How to fix

Implement __toString() on the class, or cast explicitly with (string) only after implementing it.

<?php
class Point {
    public function __construct(public int $x, public int $y) {}

    public function __toString(): string {
        return "({$this->x}, {$this->y})";
    }
}