Overflow in pow()

Description

The following code:

<?php
$a = gmp_init(10000000000);
var_dump(pow($a, $a)); // or var_dump($a**$a);

Resulted in this output:

gmp: overflow in mpz type
Aborted (core dumped)

But I expected this output instead:

float(INF)

PHP Version

nightly

Operating System

ubuntu 22.04

Apparently, the library aborts, instead of signaling failure by some other means. At least mpir 3.0.0, which we use on Windows (and which is no longer maintained), aborts even on memory allocation failures. If gmplib behaves the same, it might not something we can fix.

I think we should call mp_set_memory_functions() to install ZendMM.

PS: see #16507.

Possibly partial fix for this issue on Windows: BrianGladman/mpir@33be900

This is now solved. Closing.

<?php
$a = gmp_init(10000000000);
var_dump(pow($a, $a)); // or var_dump($a**$a);

PHP Fatal error:  Uncaught ValueError: Exponent must be between 0 and 4294967295 in C:\Users\admin\Desktop\bench.php:3
Stack trace:
#0 C:\Users\admin\Desktop\bench.php(3): pow(Object(GMP), Object(GMP))
#1 {main}
  thrown in C:\Users\admin\Desktop\bench.php on line 3

Fatal error: Uncaught ValueError: Exponent must be between 0 and 4294967295 in C:\Users\admin\Desktop\bench.php:3
Stack trace:
#0 C:\Users\admin\Desktop\bench.php(3): pow(Object(GMP), Object(GMP))
#1 {main}
  thrown in C:\Users\admin\Desktop\bench.php on line 3

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Overflow in pow() #16502

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Overflow in pow() #16502

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cmb69 commented on Oct 19, 2024

cmb69 commented on Oct 19, 2024

cmb69 commented on Oct 19, 2024

LamentXU123 commented on Jul 19, 2026

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