FatalThrowableErrorParse error: syntax error, unexpected '?', expecting variable (T_VARIABLE)

[yehlu]

composer.json
需要 lock php 在 7.0

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   "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true,
        "platform": {
                "php": "7.0"
        }
    },

再做 降套件

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composer update