Laravel：PHP 解析错误：语法错误，意外的“？” 在第 500 行的 /vendor/laravel/framework/src/Illuminate/Foundation/helpers.php
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Laravel: PHP Parse error: syntax error, unexpected '?' in /vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 500
提问by Ricardo Santos
Since i upgraded my php version from 5.6 to 7.2, i have a persistant error on my php_errors.log:
PHP Parse error: syntax error, unexpected '?' in /vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 500
由于我将我的 php 版本从 5.6 升级到 7.2，我的 php_errors.log 上有一个持久性错误：
PHP Parse error: syntax error, unexpected '?' in /vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 500
On Line 500:
在第 500 行：
return $factory->of($arguments[0], $arguments[1])->times($arguments[2] ?? null);
return $factory->of($arguments[0], $arguments[1])->times($arguments[2] ?? null);
I Search for this on stackoverflow, and the main cause is server still using php5.6, but i think it's not the reason. Platform is Laravel 5.7 and apparently is all working fine.
我在stackoverflow上搜索这个，主要原因是服务器仍在使用php5.6，但我认为这不是原因。平台是 Laravel 5.7，显然一切正常。
If i run php -vfrom the terminal i got PHP 7.2:
如果我php -v从终端运行，我会得到 PHP 7.2：
PHP 7.2.12-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Nov 12 2018 09:55:12)(NTS)
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.2.12-1+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies
PHP 7.2.12-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Nov 12 2018 09:55:12)(NTS)
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.2.12-1+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies
Some questions on stackoverflow suggest adding a phpinfo to show the php version used by the system, and actually is the correct:
stackoverflow上的一些问题建议添加一个phpinfo来显示系统使用的php版本，其实是正确的：
Even if i tried to disable old version, server says that php5.6 is already disabled:
即使我试图禁用旧版本，服务器也说 php5.6 已经被禁用：
Module php5.6 already disabled
Module php5.6 already disabled
With php5.6 disabled and php 7.2 up and running, what could be causing this ?
禁用 php5.6 并启动并运行 php 7.2，这可能是什么原因造成的？
Thanks in advance.
提前致谢。
采纳答案by Ricardo Santos
Problem solved with a server reboot, as suggested by @MonkeyZeus. Apparently something was not adding up after upgrade both PHP and Laravel.
正如@MonkeyZeus 所建议的那样，通过服务器重启解决了问题。显然，在升级 PHP 和 Laravel 后，某些事情并没有增加。
回答by Pawan Kumar
This problem occurs because your version path is still 5.6 set it 7.2
出现这个问题是因为你的版本路径还是5.6 设置为7.2
//SWITCHING between PHP versions
//在PHP版本之间切换
sudo update-alternatives --set php /usr/bin/php5.6
sudo update-alternatives --set phar /usr/bin/phar5.6
sudo update-alternatives --set phar.phar /usr/bin/phar.phar5.6
sudo a2dismod php7.2
sudo a2enmod php5.6
须藤更新替代品 --set php /usr/bin/php5.6
须藤更新替代品 --set phar /usr/bin/phar5.6
sudo update-alternatives --set phar.phar /usr/bin/phar.phar5.6
须藤 a2dismod php7.2
须藤 a2enmod php5.6
//Switch into php 7.2
//切换到php 7.2
sudo update-alternatives --set php /usr/bin/php7.2
sudo update-alternatives --set phar /usr/bin/phar7.2
sudo update-alternatives --set phar.phar /usr/bin/phar.phar7.2
sudo a2dismod php5.6
sudo a2enmod php7.2
须藤更新替代品 --set php /usr/bin/php7.2
须藤更新替代品 --set phar /usr/bin/phar7.2
须藤更新替代品 --set phar.phar /usr/bin/phar.phar7.2
须藤 a2dismod php5.6
须藤 a2enmod php7.2
