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Magento 2.1.9 is not working with php@7.0.33

According to Magento doc, this Magento CE V.2.1.9 will support php7.1.29 but with some reason, its not working. I was getting below error. Magento 2.1.9 only supports php versions "~5.6.5, 7.0.2, 7.0.4 and ~7.0.6". They have mentioned php@7.1 in their documentation but with some reason its not working.

To resolve that, I tried switched to php@7.0.33. Doing that, I able remove above error and complete composer install. but I was started getting deprecated functions error while running the application on browser.

On my side, I use laravel valet for dev environment and use homebrew to install packages.

Based on error in screenshot, we need php@7.0.2 or 7.0.4 to make Magento 2.1.9 work. That means I have downgrade the version using homebrew. So far, I couldn't find any method.

https://stackoverflow.com/questions/56205430/how-do-i-install-php7-1-0-using-brew-on-mac?noredirect=1#comment99253547_56205430

TEMPORARY FIX:

To continue my magento 2.1.9 development work in laravel valet, Only option is to edit Magento vendor files by removing those deprecated errors.

1. Switch to php@7.0.33 using brew install php@7.0 and finish "composer install"



2. 
   

   Edit vendor/magento/framework/Session/SessionManager.php

   
   
   

   Change

   
   
   

   "ini_set('session.use_only_cookies', '1');"

   
   
   

   To

   
   
   

   if(!$this->isSessionExists()) ini_set('session.use_only_cookies', '1');

   
   


3. 
   

   Edit vendor/colinmollenhour/cache-backend-file/File.php

   
   
   

   Change

   
   
   

   while (list($name, $value) = each($options)) $this->setOption($name, $value);

   
   
   

   To

   
   
   

   foreach ($options as $name => $value) $this->setOption($name, $value);

   
   


4. 
   

   Edit vendor/magento/zendframework1/library/Zend/Cache/Backend.php

   
   
   

   Change

   
   
   

   while (list($name, $value) = each($directives))
if (!is_string($name))
Zend_Cache::throwException("Incorrect option name : $name");

$name = strtolower($name);
if (array_key_exists($name, $this->_directives))
$this->_directives[$name] = $value;



   
   
   

   To

   
   
   

   foreach ($directives as $name => $value)
if (!is_string($name))
Zend_Cache::throwException("Incorrect option name : $name");

$name = strtolower($name);
if (array_key_exists($name, $this->_directives))
$this->_directives[$name] = $value;



   
   


5. 
   

   vendor/magento/module-eav/Model/Entity/Collection/AbstractCollection.php

   
   
   

   Change

   
   
   

   list($tableAlias, $tableName) = each($table);

   
   
   

   To

   
   
   

   foreach ($table as $tableAlias => $tableName)


   
   
   
   6. Update getAllOptions function in following files.
   
   

   vendor/magento/module-customer/Model/Customer/Attribute/Source/Website.php
   vendor/magento/module-customer/Model/Customer/Attribute/Source/Store.php
   vendor/magento/module-customer/Model/Customer/Attribute/Source/Group.php

   
   
   

   Update the function declaration by including arguments.

   
   
   

   getAllOptions($withEmpty = true, $defaultValues = false)

   
   

IMPORTANT NOTE: This is a temporary fix, Here I am editing magento vendor files and that is not recommended. The reason why I am moving to this method because I couldn't find any way to install any of the Magento 2.1.9 supported php versions using brew. If anyone knows that method, please share.