EC
DivisionByZeroError
PHPERRORCommonMath

Integer divided or modulo by zero

Quick Answer

Guard divisors before integer division; use fdiv() for floating-point division that returns INF/NAN instead of throwing.

What this means

Thrown when an integer is divided by zero using / or % operators. Note: fdiv() returns INF or NAN instead of throwing.

Why it happens
  1. 1$a % 0 or intdiv($a, 0)
  2. 2Divisor derived from user input without validation

Fix

Guard divisor

Guard divisor
$result = $divisor !== 0 ? intdiv($a, $divisor) : 0;

// Float-safe alternative
$result = fdiv($a, $divisor); // returns INF or NAN, never throws

Why this works

fdiv() follows IEEE 754 — never throws, returns INF/NAN for division by zero.

Code examples
Triggerphp
$x = 10 % 0; // DivisionByZeroError
Safe integer dividephp
function safeDivide(int $a, int $b): int {
    return $b !== 0 ? intdiv($a, $b) : 0;
}
fdiv for floatsphp
$r = fdiv(10.0, 0.0); // INF — no exception

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