$stack
$stack : array<mixed,mixed>
The parser stack for formulae.
push(mixed $type, mixed $value, mixed $reference = null, null|string $storeKey = null, null|string $onlyIf = null, null|string $onlyIfNot = null)
Push a new entry onto the stack.
| mixed | $type | |
| mixed | $value | |
| mixed | $reference | |
| null|string | $storeKey | will store the result under this alias |
| null|string | $onlyIf | will only run computation if the matching store key is true |
| null|string | $onlyIfNot | will only run computation if the matching store key is false |