Solution Magento 2.1.3 on PHP 7.1.0

here's how to in the latest PHP 7.1.0 on install and run the latest Magento 2.1.3 .

Patch installation files

Magento 2.1.3 Check the PHP version and refuse to install it using PHP 7.1.0. We'll get around it .

Open setup/src/magento/setup/model/phpredinesscheck.php and Change line 79th

From:

$normalizedPhpVersion = $this->getnormalizedcurrentphpversion (php_version);
To:

$normalizedPhpVersion = $this->getnormalizedcurrentphpversion (' 7.0.2 ');

2. Prohibit MCrypt warning

Edit vendor/magento/framework/encryption/crypt.php and associate all Mcrypt/mdecrypt functions with @

@mdecrypt_generic
This is a diff file:

54c54
< $this->_handle = @mcrypt_module_open ($cipher, ', $mode, ');
---
> $this->_handle = Mcrypt_module_open ($cipher, ', $mode, ');
56c56
< $maxKeySize = @mcrypt_enc_get_key_size ($this->_handle);
---
> $maxKeySize = mcrypt_enc_get_key_size ($this->_handle);
62c62
< $initVectorSize = @mcrypt_enc_get_iv_size ($this->_handle);
---
> $initVectorSize = mcrypt_enc_get_iv_size ($this->_handle);
80c80
< @mcrypt_module_close ($this->_handle);
---
> Mcrypt_module_close ($this->_handle);
83c83
< @mcrypt_generic_init ($this->_handle, $key, $initVector);
---
> Mcrypt_generic_init ($this->_handle, $key, $initVector);
93,94c93,94
< @mcrypt_generic_deinit ($this->_handle);
< @mcrypt_module_close ($this->_handle);
---
> Mcrypt_generic_deinit ($this->_handle);
> Mcrypt_module_close ($this->_handle);
138c138
< return @mcrypt_generic ($this->_handle, $data);
---
> Return mcrypt_generic ($this->_handle, $data);
152c152
< $data = @mdecrypt_generic ($this->_handle, $data);
---
> $data = mdecrypt_generic ($this->_handle, $data);
Clear cache:

RM-RF var/cache/*
RM-RF var/generation/*

Solution Magento 2.1.3 on PHP 7.1.0