在Smarty模板中，我可以简单地检查数组中的值，如果为空，则可以输出如下默认值：
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531244 10041 remote_runtime.go:92] RunPodSandbox from runtime service failed: rpc error: code = Unknown desc = [failed to set up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-8t7bt_kube-system" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to teardown pod "coredns-78fcdf6894-8t7bt_kube-system" network: failed to get IP addresses for "eth0": <nil>]
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531286 10041 kuberuntime_sandbox.go:56] CreatePodSandbox for pod "coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)" failed: rpc error: code = Unknown desc = [failed to set up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-8t7bt_kube-system" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to teardown pod "coredns-78fcdf6894-8t7bt_kube-system" network: failed to get IP addresses for "eth0": <nil>]
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531298 10041 kuberuntime_manager.go:646] createPodSandbox for pod "coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)" failed: rpc error: code = Unknown desc = [failed to set up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-8t7bt_kube-system" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to teardown pod "coredns-78fcdf6894-8t7bt_kube-system" network: failed to get IP addresses for "eth0": <nil>]
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531358 10041 pod_workers.go:186] Error syncing pod 7caa3f29-89c3-11e8-aa0f-00505693ca30 ("coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)"), skipping: failed to "CreatePodSandbox" for "coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)" with CreatePodSandboxError: "CreatePodSandbox for pod \"coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)\" failed: rpc error: code = Unknown desc = [failed to set up sandbox container \"8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c\" network for pod \"coredns-78fcdf6894-8t7bt\": NetworkPlugin cni failed to set up pod \"coredns-78fcdf6894-8t7bt_kube-system\" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container \"8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c\" network for pod \"coredns-78fcdf6894-8t7bt\": NetworkPlugin cni failed to teardown pod \"coredns-78fcdf6894-8t7bt_kube-system\" network: failed to get IP addresses for \"eth0\": <nil>]"
Jul 17 10:09:28 master03 kubelet: W0717 10:09:28.636173 10041 cni.go:243] CNI failed to retrieve network namespace path: cannot find network namespace for the terminated container "88183d8a24dcafca5b04e3a6454e83aca1417a6934f50cd52b3e6fffbae4f272"
Jul 17 10:09:28 master03 kernel: XFS (dm-18): Mounting V4 Filesystem
如何在laravel刀片中简单地执行同样的操作而没有嵌套的@if语句？
{$smarty.session.foo['bar']|default:"empty"}
我该怎么做速记？
答案 0 :(得分：0)
Blade为此使用 execute immediate v_qry bulk collect into v_cmp_cols;
FOR j in 1..v_cmp_cols.count loop
DBMS_Output.PUT_LINE (v_cmp_cols(j).job_name
||','|| v_cmp_cols(j).type_of_batch);
end loop;
构建了内置结构。
ORBlade还接受常规PHP，因此您可以使用elvis运算符跳过任何错误值：
{{ session('foo')->bar OR 'empty' }}
或者使用null-coalescing运算符跳过null值（PHP7 +）。
{{ session('foo')->bar ?: 'empty' }}
尽管如此，{{ session('foo')->bar ?? 'empty' }}
仍需要返回一个对象。