遇到非数字值 [英] A non-numeric value encountered

问题描述

我有这条线，但我不知道如何更改以跳过此错误

I have this line, but i don't know what to change to skip this error

$media_query = '@media screen and (max-width: ' . intval( Avada()->settings->get( 'side_header_break_point' ) ) - 32 . 'px)';

推荐答案

需要注意的操作顺序为:

You need to pay attention to the order of operation as :

点运算符与 + 和 - 具有相同的优先级，可以产生意想不到的结果.

the dot operator has the same precedence as + and -, which can yield unexpected results.

因此，在您的情况下，您在应用减号操作之前可能"形成了两个字符串，为避免这种情况，您需要添加如下括号:

So in your case you have 'maybe' formed two strings before applying the minus operation, to avoid this you need to add parenthesis like this :

'(max-width: ' . (intval( Avada()->settings->get( 'side_header_break_point' ) ) - 32) . 'px)';

您可以在这里了解更多信息:http://php.net/manual/fa/language.operators.precedence.php

You can learn more here : http://php.net/manual/fa/language.operators.precedence.php

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