Thinkphp layer-4 if labels cannot be parsed. how can this problem be solved?

Thinkphp layer-4 if tags cannot be parsed if tags can only be parsed to layer-3, and if on layer-4 cannot be parsed. I set TAG_NESTED_LEVEL & nbsp; & gt; 5, but it still has no effect. Ask for a solution. It seems that & lt; if & gt; & lt; if1 & gt; & lt; if2 & gt; & lt; if3 & gt; & lt; if3 & gt; & lt; if2 & gt; & lt; if1 & gt; & l thinkphp layer-4 if tag cannot be parsed
The if tag can only be parsed to the third layer. if on the fourth layer, it cannot be parsed. I set "TAG_NESTED_LEVEL" => 5, but it still does not work. Ask for a solution. Usage No ....
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By default, only three layers of source code can be modified.
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Reference:

Quote: reference:

By default, only three layers of source code can be modified.

How to modify it? "TAG_NESTED_LEVEL" => 5.

Modify the nested LEVEL of the TagLibCx class library