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Different tasks may require running multiple versions of PHP. You may need to switch PHP versions by running two sites on the same server or testing older versions of code using outdated methods. We can switch PHP versions on Ubuntu using t...

Let's say you're in a login form and you enter the wrong information; in this case, you probably want to go back to the login page. PHP has a built-in function header() to redirect a page to a specific page. But what if the login page is at...

This article shows you how to div id store a in a PHP variable and pass it to JavaScript code. We will answer the following questions. What is div id ? How to div id store in a PHP variable? How to pass variables to JavaScript code? Let’s...

We will use PHP and ajax by printing a simple sum of two numbers 2 and . Also, print a php array in JSON. 3 object We will also use PHP with ajax by getting the HTML formatted output from the number division in PHP. Printing simple addition...

PHP $_POST is a super global variable that can contain key-value pairs of HTML form data submitted through the post method. We will learn different ways to check $_POST if a and contains some data in this article. These methods will use iss...

This tutorial teaches how to restore from a MultiIndex to a single index DataFrame in Pandas using Python. MultiIndex DataFrame, also known as multi-level and hierarchical DataFrame, allows users to have multiple columns that can identify a...

This tutorial explains how to pandas.DataFrame.reset_index() reset the index in a Pandas DataFrame using . reset_index() The method sets the index of the DataFrame to the default index, a number ranging from 0 to (DataFrame 中的行数-1)...

SQL stands for Structured Query Language; it is a well-known language for interacting with relational databases. There are many ways to run SQL queries in Python. pandasql Run SQL queries in Python using This package has a method similar to...

Pandas has a method to split a string based on a separator/delimiter. We will use the pandas str.split() function. str.split() Split a string into two lists/columns using the function in Python Pandas The string can be saved as a list of Se...

Pandas Series is a one-dimensional array that can hold any data type and label. Suppose you have a Pandas Series of String datetime objects. We can convert a String object to its string equivalent using strftime() the String function and so...

This article will show you how to create one or more callback functions and execute them using different built-in methods, user-defined functions, and static classes in PHP. Create a function in PHP callback and call_user_func execute it us...

This article will demonstrate installing sendmail the library and sending an email through the PHP mail form. Install sendmail to send email from PHP on local server PHP has a built-in function mail() to send emails. However, this function...

When we have a large web application running in production mode, we need to monitor all errors or potential errors that our users may face. The best way to keep an eye on all possible errors is to log them to a file as they occur. This arti...

PHP has two ways to validate phone numbers, one is regular expression regex and the other is filter the method. We can use to regex set a template and validate the phone number based on that template, but filter will only exclude the unwant...

PHP allows us to use shell_exec(); the shell function to process files. However, if your operating system is Windows, you should consider using the popen() and pclose() functions, because pipes are executed in text mode, which usually preve...