Laravel Fix Error : Function name must be a string by Illuminate\Pipeline\Pipeline.php

Issue: Laravel encountered error "Function name should be a string" or "Function name must be a string" in Api or somewhere. Error reported from file "Illuminate\Pipeline\Pipeline.php"

$carry = method_exists($pipe, $this->method)

                                    ? $pipe->{$this->method}(...$parameters)

                                    : $pipe(...$parameters);

Reason: You have used some middleware by name that has not been previously declared.

Debug: Check all middleware used, make sure it is already declared in the file Kernel.php. The most common scenario is that you have not declared 'auth' middleware yet.

protected $routeMiddleware = [

        'auth' => \Illuminate\Auth\Middleware\Authenticate::class,

        ...

}

Done ! 

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Fix PHP Mongodb Error: connection refused calling ismaster on 'localhost:27017'

Step by step, Debug and fix PHP Mongodb error "No suitable servers found". This tutorial works with pure php and also popular php frameworks today such as: Laravel, Yii, CodeIgniter ...

Raw Error:

No suitable servers found (`serverSelectionTryOnce` set): 
[connection refused calling ismaster on 'localhost:27017']
[connection refused calling ismaster on '127.0.0.1:27017']

Debug Step by Step !

1. Check if mongodb is working or not:

netstat -tulpn | grep LISTEN

Please check if the mongodb process is working or not, the correct port or not. If the mongodb server is not working properly please resolve that issue.

2. Check that the php-mongodb extension is installed correctly (Unrelated, but I think it is useful)

Create a php file with content:

<?php
phpinfo();
?>

If no Mongodb found in the results page means you are missing this ext. Please install it according to the following tutorial: https://www.codesiri.com/2020/07/install-php-mongodb-extension-for-php7.html

3. Can you connect to the mongodb server via the Command line (CLI)?

mongo

4. Check SELinux Permission (Very important)

If you've debugged through steps 1 - 3 and haven't found the problem yet, SELinux is probably the problem that caused your error.

For added security, SELinux is enabled by default on newer server versions. By default SELinux will not allow apache, PHP is automatically opened to the new socket to connect out (or local). Meanwhile, php-mongodb ext needs to initialize the socket to connect to the mongodb server. So you will encounter the error as seen.

To fix this issue grant SELinux permission to apache to freely open the socket.

setsebool -P httpd_can_network_connect 1

Note: Some other php libraries that use sockets may have similar problems with SELinux, for example: php-redis, curl ...

Done !

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Fix Laravel Error - Please provide a valid cache path

Error when install new Laravel project in server.

InvalidArgumentException
Please provide a valid cache path.

This error can be caused by

…/vendor/laravel/framework/src/Illuminate/View/Compilers/Compiler.php line 36

* Reason: 

To increase performance, the default laravel will need to be configured in a directory to store the cache files of views, sessions ...., so you need a cache directory in your project. Normally this directory will be created automatically, but in some situations such as the user who does not have much experience in the installation of the project git, this cache directory may be lost or incorrect.

* Solve:

Declare the cache directory for Laravel and make sure php needs write permissions in that directory

- create 4 folder for cache:

.../bootstrap/cache
.../storage/framework
.../storage/framework/views
.../storage/framework/cache
.../storage/framework/sessions

(... is the path to your project folder)

- grant write permissions to these directories (777 is not a good choice for security)

chmod 777 .../bootstrap/cache -R
chmod 777 .../storage/framework -R

- To keep these directories empty in the git project, you can add a .gitignore file to those directories with the content:

*
!.gitignore

- If your server is using selinux remember to give write permission to php

sudo chcon -t httpd_sys_rw_content_t .../bootstrap/cache -R
sudo chcon -t httpd_sys_rw_content_t .../storage/framework -R

Done !

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[Linux] Install PHP mongodb extension for PHP 7.2 and higher

This article will guide you to install php mongodb extension for PHP7 on linux operating system platform. The operating system we use is Centos, but it is also true for other linux distributions like Ubuntu, Redhat, Fedora ....

When upgrading to PHP7 we often encounter problems when we cannot install the php-mongo extension. You may encounter the following error message:

Package: php-pecl-mongo-1.6.14-1.el7.remi.5.4.x86_64 (remi)
Requires: php(zend-abi) = 20100525-64

* Reason: 

We have 2 mongo extensions for PHP: php-mongo and php-mongodb. Php-mongo only supports php 5.6, but php-mongodb supports the latest version 7.4. That's why you have an error when trying to install php-mongo for PHP7.

php-mongo is older and has been discontinued, but it is currently available as a library in remi repos. And php-mongodb is Pecl's latest library but it is not available and you have to install it yourself via php-pear.

* Solving problems: install php-mongodb extension for PHP7 

Step 1: Install apache(httpd) and php 7

You can refer to this tutorial: https://linuxize.com/post/install-php-7-on-centos-7/

Step 2: Install php-pear

install gcc php-pear php-devel

Step 3: Install mongodb extension 

pecl install mongodb

Step 4: Enable php-mongodb extension 

open php.ini file, then add the following line

;;;;;;;;;;;;;;;;;;;;;;
; Dynamic Extensions ;
;;;;;;;;;;;;;;;;;;;;;;
extension=mongodb

Step 5: Verify PHP Mongodb extension is enabled

php -m

Done !

* Note: The syntax used in previous PHP versions ('extension=<ext>.so' and 'extension='php_<ext>.dll') is supported for legacy reasons and may be deprecated in a future PHP major version. So, when it is possible, please move to the new ('extension=<ext>) syntax.

* Refer: https://blog.remirepo.net/pages/PECL-extensions-RPM-status

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