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psalm/docs/running_psalm/issues/PossiblyFalseOperand.md

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# PossiblyFalseOperand
Emitted when using a possibly `false` value as part of an operation (e.g. `+`, `.`, `^` etc).
```php
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<?php
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function echoCommaPosition(string $str) : void {
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echo 'The comma is located at ' . strpos($str, ',');
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}
```
## How to fix
You can detect the `false` value with some extra logic:
```php
<?php
function echoCommaPosition(string $str) : void {
$pos = strpos($str, ',');
if ($pos === false) {
echo 'There is no comma in the string';
}
echo 'The comma is located at ' . $pos;
}
```
Alternatively you can just use a ternary to suppress this issue:
```php
<?php
function echoCommaPosition(string $str) : void {
echo 'The comma is located at ' . (strpos($str, ',') ?: '');
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}
```