pub fn zend_version(&self) -> Result<u32> {
        self.get_key("PHP API")
            .context("Failed to get Zend version")
            .and_then(|s| u32::from_str(s).context("Failed to convert Zend version to integer"))
    }
Get the zend version.

# Errors
- `PHPInfo` does not contain php api version
build.rs