Function received an argument whose type does not match strict type declarations.
PHP strict types (`declare(strict_types=1);`) or scalar type hints throw a `TypeError` when a function parameter receives a value of an incompatible type.
Passing string numbers (`"123"`) into an `int` parameter when strict mode is enabled, or passing `null` into non-nullable parameter.
1<?php2declare(strict_types=1);3 4function addNumbers(int $a, int $b): int {5 return $a + $b;6}7 8// Passing string "10" instead of int 109echo addNumbers("10", 20); // Fatal error: Uncaught TypeError1<?php2declare(strict_types=1);3 4function addNumbers(int $a, int $b): int {5 return $a + $b;6}7 8// Fix 1: Pass explicit int value9echo addNumbers(10, 20);10 11// Fix 2: Explicit cast before calling function12$input = "10";13echo addNumbers((int)$input, 20);Simulate standard system builds to trigger compiler trace records and track memory crashes locally.
Strict mode enforces exact type checks. Parameter `$a` expects `int`, but received `string "10"`.