Hello. My name is A.R. ZERIN. I am an Entrepreneur, Technology Optimist and a Software Engineer from Dhaka, Bangladesh .
Programming is my passion. Life is beautiful, so I am trying hard to enjoy it.
I have completed my Undergraduate Degree in Computer Science & Engineering at 2004 and working in the era of IT for last 14+ years dedicatedly.
I am a believer of, “He who aims at the sky, shoot higher much than he who aims at a tree“.

IOS + Swift Swift 5
Swift – create expanding lists
May 9, 2021
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// //  MainView.swift //  MySwiftLearning1 // //  Created by Arifur Rahman Jerin on 4/30/21. // import SwiftUI struct Bookmark: Identifiable {     let id = UUID()     let name: String     let icon: String     var items: [Bookmark]?     // some example websites     static let apple = Bookmark(name: […]
Swift 5
Swift – create grouped and inset grouped lists
May 9, 2021
0
//  MainView.swift //  MySwiftLearning1 // //  Created by Arifur Rahman Jerin on 4/30/21. // import SwiftUI struct Pizzeria: View {     let name: String     var body: some View {         Text(“Restaurant: \(name)“)     } } struct MainView: View {     var body: some View {     […]
Flutter Programming
Flutter Project: Insecure URL is not working in Android / IOS
April 14, 2021
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I am developing a flutter project called ZTutor. While testing in Android my login was not working, my app was sending data to localhost, which is my local pc. My localhost url was http://192.168.0.105/ztutor/login.php but that url was not receiving any request from the App. So, I changed in the android/app/src/main/AndroidManifest.xml: I have added this […]
Linux CentOS MySQL 5.7
MySQL “Order By Clause” Not Working with “SELECT DISTINCT and ORDER BY” after MySQL Update to 5.7
April 8, 2021
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I have recently updated our MySQL server to MySQL 5.7. Then I have found that in all the projects that has “SELECT  DISTINCT and ORDER BY” SQL statements, are not working anymore. In Order to Fix that I followed the below procedure: Logged in To Server (CentOS 7). In console mode typed # mysqld –help […]
Flutter Network
flutter – android – http.get never works in deployed device / release mode
April 8, 2021
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Recently while working & testing on my own app Zbotics (That assist with Robot Voice when to do what to my family member) which has been made by flutter 2, I have found that App loads data using http.get properly in IOS Simulator & real device but it was not working in Android Device at […]
Uncategorized
My Motivations Video(s)
September 1, 2020
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IOS Programming
firebase: PERMISSION_DENIED: Missing or insufficient permissions
July 28, 2020
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While Developing IOS App that writes / reads from Firebase, I have found that it was not writing any data in Firebase or can not read data from Firebase, when I saw console, I found a error like “[Firebase/Firestore][I-FST000001] WriteStream (7fea67f13818) Stream error: ‘Permission denied: Missing or insufficient permissions.'” So, then I have gone to […]
Commands Linux CentOS php Server WHM
WHM:: PHP Mail is Not Working-Showing Its Disable
June 24, 2020
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When your mail does not work, one example could be as below: Now Update your php.ini from WHM MultiPHP INI Editor, you can see: disable_functions = mail Modify it with disable_functions = Click Save Restart your APACHE from WHM or command prompt.
Commands Linux CentOS
How to Whitelist IP/ finding if IP is Blacklisted in Linux CentOS
June 18, 2020
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1. How to check if an IP is Blacklisted: If you want to blacklist the IP 123.45.67.89 , then run the below command: $ /scripts/cphulkdblacklist 123.45.67.89 You will see a message that the IP has been blacklisted. ####################################################### 2. How to whitelist an IP that is Black Listed If you want to Whitelist the IP […]
Cleaning Commands Linux CentOS
How To Check for Virus / Malware Script in Server / WordPress Site
May 25, 2020
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Check Recently Modified Files in Server Login to server through SSH, run the below commands to find out which scripts have been uploaded recently $ cd /home/public_html/$ find ./ -type f -mtime -15 (this code checks all files that has been uploaded / modified in last 15 days) $ find /etc -type f -printf ‘%TY-%Tm-%Td […]
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