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False positive: strlen(ltrim(number_format())) #13784
Description
Bug report
PHPStan incorrectly reports a type error when using ltrim() with the result of number_format() inside strlen()
function ok(): int {
return strlen(number_format(15, 0, '', ''));
}
/**
* @param numeric-string $str
*/
function ok2(string $str): int {
return strlen($str);
}
function fail(): int {
return strlen(ltrim(number_format(15, 0, '', ''), '-'));
}Error: Parameter #1 $string of function strlen expects string, numeric-string given.
Code snippet that reproduces the problem
https://phpstan.org/r/73c4b606-2bc7-4450-8c0d-3bdc7867dd75
Expected output
No error
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Activity
VincentLanglet commentedon Nov 11, 2025
Should be solved with phpstan/phpstan-src#4550
github-actions commentedon Jan 6, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.