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This article mainly introduces the example analysis of constant visibility in PHP7, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

Constant visibility (PHP7.1) class Mother {private const ERROR_LEVEL_1 = 'achtung';}

Visibility helps ensure that content that should not be overwritten is not overwritten. Before PHP 7.1, it was impossible for class constants (which were always public).

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