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Check if argument passed to isset() is not a variable #10068

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Aug 1, 2023
Merged

Check if argument passed to isset() is not a variable #10068

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23 changes: 23 additions & 0 deletions src/Psalm/Internal/Analyzer/Statements/Expression/IssetAnalyzer.php
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,12 @@
namespace Psalm\Internal\Analyzer\Statements\Expression;

use PhpParser;
use Psalm\CodeLocation;
use Psalm\Context;
use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Issue\InvalidArgument;
use Psalm\IssueBuffer;
use Psalm\Type;

/**
Expand All @@ -30,6 +33,15 @@ public static function analyze(
$context->vars_in_scope[$var_id] = Type::getMixed();
$context->vars_possibly_in_scope[$var_id] = true;
}
} elseif (!self::isValidStatement($isset_var)) {
IssueBuffer::maybeAdd(
new InvalidArgument(
'Isset only works with variables and array elements',
new CodeLocation($statements_analyzer->getSource(), $isset_var),
'empty',
),
$statements_analyzer->getSuppressedIssues(),
);
}

self::analyzeIssetVar($statements_analyzer, $isset_var, $context);
Expand All @@ -49,4 +61,15 @@ public static function analyzeIssetVar(

$context->inside_isset = false;
}

private static function isValidStatement(PhpParser\Node\Expr $stmt): bool
{
return $stmt instanceof PhpParser\Node\Expr\Variable
|| $stmt instanceof PhpParser\Node\Expr\ArrayDimFetch
|| $stmt instanceof PhpParser\Node\Expr\PropertyFetch
|| $stmt instanceof PhpParser\Node\Expr\StaticPropertyFetch
|| $stmt instanceof PhpParser\Node\Expr\NullsafePropertyFetch
|| $stmt instanceof PhpParser\Node\Expr\ClassConstFetch
|| $stmt instanceof PhpParser\Node\Expr\AssignRef;
}
}
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