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ExponentiateHelper: fix internal error and internal warning #3031

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@janedbal janedbal commented Apr 24, 2024

Probably fixes even phpstan/phpstan#10125

Warning: A non-numeric value encountered on phar:///home/honza/Development/shipmonk/phpstan-rules/vendor/phpstan/phpstan/phpstan.phar/src/Type/ExponentiateHelper.php:72

Found in https://github.com/shipmonk-rnd/phpstan-rules tests when run with new 204ab27

$result = $base->getValue() ** $exponent->getValue();
try {
// @ to avoid "Warning: A non-numeric value encountered"
$result = @pow($base->getValue(), $exponent->getValue()); // @phpstan-ignore-line
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I'd rather prevent the problem by checking the type of the values instead of silencing the error.

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That would require some crazy regexes. I dont think there is a simple way to simulate the magical numeric-string behaviour: https://3v4l.org/ECZjp#v8.3.6

This way we are sure we get exactly what PHP evalutes.

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Looks like is_numeric would do the job: https://3v4l.org/sYolO#v8.3.6

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Not really, those are both numeric, but results in different output type: https://3v4l.org/aDslS#v8.3.6

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There is a similar open PR you might can get inspiration from

#2796

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