DivisionByZeroError 🐘 PHP

Fatal error: Uncaught DivisionByZeroError: Division by zero

Code divided by zero (or used modulo by zero) — PHP 8 throws instead of warning.

Seen on: PHP

Meaning

PHP 8 converted division by zero from a warning into DivisionByZeroError. Averages, percentages and ratios over empty data are the usual source.

Common causes

  • Empty dataset (count is 0) used as a divisor
  • User input of 0
  • Modulo by zero (%)

⚡ Quick fix

  1. Guard the divisor: $total > 0 ? $sum / $total : 0
  2. Use fdiv() to get INF/NAN instead of an exception
  3. Validate numeric input

Detailed fix by platform

PHP

  1. $avg = $count ? $sum / $count : 0;

How to diagnose

  1. Expression — Which division?
  2. Data — Why is the divisor 0?

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