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26 lines
340 B
Markdown
26 lines
340 B
Markdown
# MixedOperand
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Emitted when Psalm cannot infer a type for an operand in any calculated expression
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```php
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<?php
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echo $_GET['foo'] + "hello";
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```
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## Why it’s bad
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Mixed operands can have fatal consequences, e.g. here:
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```php
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<?php
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function foo(mixed $m) {
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echo $m . 'bar';
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}
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class A {}
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foo(new A()); // triggers fatal error
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```
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