Please tell me how to calculate $x .= $y, input it into the code box, and an error will be reported after running. Link https://www.php.cn/code/1051.html

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Could you please tell me how to calculate $x .= $y? Enter it into the code box, but an error will be reported after running it.

Link https://www.php.cn/code/1051.html

Rebecca847 days ago501

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