修复Warning: A non-numeric value encountered

图片描述：

原因：
官方文档

New E_WARNING and E_NOTICE errors have been introduced when invalid strings are coerced using operators expecting numbers (+ – * / ** % << >> | & ^) or their assignment equivalents. An E_NOTICE is emitted when the string begins with a numeric value but contains trailing non-numeric characters, and an E_WARNING is emitted when the string does not contain a numeric value.

译：

在使用(+ – * / ** % << >> | & ^) 进行运算时，例如$a+$b，如果变量$a是以一个数字值开头，但包含非数字字符，例如(123d)；或变量$b不是以数字值开头时，例如(b456)，就会有A non-numeric value encountered警告。

解决办法：
– vim打开functions.php
– 修改$daysago = date( "Y-m-d H:i:s", strtotime($today) - ($days * 24 * 60 * 60) );为$daysago = date( "Y-m-d H:i:s", strtotime($today) - (intval($days) * 24 * 60 * 60) );

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参考资料:https://blog.csdn.net/fdipzone/article/details/78659784

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