The programmer-Thinkphp template engine has too many if nested hierarchies. if nested 3 levels, an error is reported. The complete code is displayed.

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Https://github.com/liu21st/thinkphp/blob/master/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php#L24

The official Cx template library defines the default nested layers of if. modifying this layer can support more nested formats.

A maximum of three levels are allowed. If the limit is exceeded, use switch.