F::update()
Serializes concurrent read-update-writes of a file by holding an exclusive flock for the whole operation, so that other writers (that lock the same way) cannot lose each other's updates. The $modifier callback receives the current file contents.
F::update(string $file, callable $modifier): boolParameters
| Name | Type | Default |
|---|---|---|
| $filerequired | string |
no default value |
| $modifierrequired | callable |
no default value |
Return type
bool