Here are code samples to generate random number and strings in PHP. Generate random numbers between 1 and 1000 $num = rand(1,1000); Using mtrand() function for better random number generation $num = mt_rand(1,1000); Generate a unique combination of numbers and letters. Works with PHP5 and higher. $unique = uniqid(); Using md5() and uniqid() function to … Read more
This article contains PHP code with regular expression to validate different numbers and strings. Integer validation can be done for validating age. Decimal validation can be done for validating price. Simple String validation can be done for validating name. Email validation can be done for validating email. preg_match PHP function is used to perform the … Read more
Problem: I want to create a dynamic HTML table with a row starting after certain number of columns, i.e. like, i want to create an html table which automatically generate new row after 3 columns in a row. Solution: $content = array(1, 2, 3, 4, 5, 6, 7, 8, 9); <table border="1" width="50%"> <tr> <?php … Read more
Below is the code with sufficient comments on making a tree navigation menu (hierarchical menu) in PHP. A single page holding different links. The navigation links are present at the left sidebar of the page. I have not used any dynamic approach over here. Have not used any loop. It’s just a static and straight-forward … Read more
In another article, I have written about Very Simple Add, Edit, Delete, View in PHP & MySQL. That article contains a basic CRUD (Create, Read, Update, Delete) system. It doesn’t have the feature of login and register. In this article, I will be presenting a complete CRUD system containing login and register feature. User should … Read more
This article shows how to backup/export and restore/import single & multiple databases and tables in MySQL. Backup/Export 1) Backup/Export single database mysqldump -h hostname -u username -p database_name > /path/backup.sql 2) Backup/Export multiple databases mysqldump -h hostname -u username -p –databases db1 db2 db3 > /path/threedb.sql Here: db1, db2, db3 are three different database name. … Read more
Problem: can’t create pid file: no such file or directory I had this problem and had a very tough and frustrating time with it. While I was installing a fresh copy of MySQL 5 in Windows XP, I got this problem. (I was installing it from the installer i.e. setup file.) The server was not … Read more
Fun with perl regular expression A) $st = “The programming republic of perl”; $1 = ?, $2 = ? and $3 = ? 1) if($st =~/(.*)(e|r)(.*)$/) 2) if($st =~/(m{1,2})(.*)$/) 3) if($st =~/(.*)(m{1,2})(.*)$/) 4) if($st =~/(.?)(m{1,2})(.*)$/) 5) if($st =~/(.+?)(e|r)(.*)$/) 6) if($st =~/(m{1,2}?)(.*?)$/) 7) if($st =~/(m{1,2}?)(.*?)/) 8 ) if($st =~/(.*})(.*)$/) Answer: 1) $1 = The programming republic … Read more
History Public-key encryption makes key-management much easier. It was invented in 1976 by two Stanford mathematicians, Whitfield Diffie and Martin Hellman. Their discovery can be phrased simply: enciphering schemes should be asymmetric. For thousands of years all ciphers were symmetric—the key for encrypting a message was identical to the key for decrypting it, but used, … Read more