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Example code of nish/phpstan-safestring-rule

Informations about the package phpstan-safestring-rule

PHPStan SafeString Rule Extension

This package is a PHPStan extension for checking unsafe string, e.g. Check calling echo without calling htmlspecialchars, check calling database query without using prepared statement.

Notice

This package does not meet the "backward compatibility promise". Because it extends the basic processing of the core, it is not guaranteed to work with version differences.

https://phpstan.org/developing-extensions/backward-compatibility-promise

Install

How to use

Add to phpstan.neon

composer.json is:

Value Object class src/ProductDto.php:

Html Template src/ProductHtml.php:

The execution result of phpstan in this case is as followings:

Then, can not call echo the string type directly.

safehtml-string is a virtual type, it can be fixed by adding a helper function.

src/functions.php:

phpstan.neon

src/ProductHtml.php:

run phpstan

OK, no errors and it's secure!

Tips

Constant String Type is not needs convert to safehtml-string.

This is no error.

When used for methods instead of functions:

Cannot specify more than one at a time.

Use safe-string Custom Type

If you have the following database access program

pdo->query() is not secure.

If the class is the following program,

I want an error to be displayed.

Achieve that by writing the following settings to phpstan.neon.

0 is the index of the argument.

Run phpstan.

More control, it can use the safe-string type.

What happens if I write a hint?

Changed to caller error.

If the string is clearly known to be "constant string (and its derivatives)", no error is raised.

Tips

Add return type rules:

factory: Nish\PHPStan\Rules\SafeStringReturnTypeRule([
    App\Db\Utils::getSafeConditionString,
])
tags: [phpstan.rules.rule]

All versions of phpstan-safestring-rule with dependencies

PHP Build Version
Package Version
Requires php Version ~7.1 || ~8.0
phpstan/phpstan Version ^1.4.6
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