How to Fix Rangeerror in PHP In Production

Encountering a rangeerror while working with PHP? This guide covers the root cause, provides a working code example, and shows you how to prevent it from recurring.

What Causes RangeError

A RangeError in production in PHP occurs when a value falls outside its permitted range. Common triggers include:

• Array or string index out of bounds
• Invalid arguments to built-in functions (negative array sizes, invalid string indices)
• Infinite recursion exceeding the maximum call stack size
• Numeric overflow or underflow in calculations
• Pagination parameters pointing past the end of a collection

How to Fix It

// Safe array access with bounds validation
function safeGet(array $arr, int $index, $default = null) {
    if ($index < 0 || $index >= count($arr)) {
        return $default;
    }
    return $arr[$index];
}

// Validate pagination in Laravel
public function index(Request $request) {
    $page = max(1, (int) $request->query("page", 1));
    $size = min(100, max(1, (int) $request->query("size", 20)));
    return User::paginate($size, ["*"], "page", $page);
}

Clamp pagination values with max/min to prevent invalid ranges. Provide safe accessor functions with default values.

Prevention Strategies

• Validate all numeric inputs at API boundaries before they reach internal logic
• Add depth limits to recursive algorithms as a safety net
• Use safe accessor methods that return null/None/Option instead of throwing
• Add upper bounds to user-supplied size parameters to prevent resource exhaustion

Catch RangeErrors before they hit production with [Bugsly](https://bugsly.dev) — get full stack traces and the exact value that was out of range for every error in your PHP app.