PHP

In PHP, when the variable is 0, the variable is "equal to" false "at the same time. How can we distinguish between 0 and false? This is useful in some condition statements. This article will give an example. First, check the Code: The function of

The unset function is a built-in function for php to destroy variables. We introduced how to use unset to destroy static variables and global variables, and how to destroy array variables. Let's look at the example below. Example 1. unset () Example

In php, there are many ways to traverse arrays, such as foreach, each, list, and for. However, in these ways, foreach provides the best array traversal performance, so I also use it frequently, next I will introduce the handler foreach to traverse

Some may find that you need to log on again when using phpmyadmin locally. This is inconvenient. Next I will introduce the default logon timeout Method for phpMyAdmin. The default timeout value of phpMyAdmin is 1800 seconds, which is too short.

Sometimes we want the IP address of the website's Changsha address to be able to log on, but the IP address of other regions cannot log on. Next I will write a php program for you, which will limit the access of an IP segment in the background.  

Php uploads an image and generates a specified size chart proportionally. This is an image scaling function, after the new image is uploaded to $ srcfile, the file is scaled down by $ thumbwidth to the maximum image width and $ thumbheitht to

Php Chinese Character Verification Code Generation Program this php Chinese Character Verification Code Generation Program is actually very simple, the generation of Chinese Character Verification Code requires the font to support, below we use

I think many of my friends will use the ucenter feature, which is a Member synchronization function. We often integrate several systems or different forums. Next I will introduce it to you. UCenter synchronization process: The premise is that you

Here we will introduce you to a mobile device check class, found from google mobile-detect class, this class can be ct judgment android, ios, Tablet, browser, and so on. Usage The Code is as follows: Copy code Include 'mobile

In php, Chinese Character regular expressions may be very simple for some friends, but during use, we will find that the gbk encoding and uft8 encoding may be a little different. The following is a small series to introduce. Chinese character

In php, the default time zone is related to China for 8 hours. Next I will introduce you to the solution of the eight-hour php time difference between linux and windows systems. I hope this will help you. Available values in mainland China:

This file upload class allows you to customize the size of the uploaded file, the type of the uploaded file, and the file storage address. It is also very helpful to use this method. One Article is that if the Chinese file name is uploaded, it will

In php, The json_decode () function can convert arrays and json-format data, but the json_decode () function only supports UTF-8 and ASCII encoding, if it is gkb, there will be problems, let's take a look at the problem analysis and solutions. It

In php, the entire function has four functions, such as floor, ceil, round, and intval. Next I will introduce the application instances between them. Floor roundingSyntax format: float floor (float value) Returns the next integer not greater than

I recently configured a wamp Server, but found that the time is different from the local time, and the time obtained by using time is displayed as date, the following describes the causes and solutions. If the date time is inconsistent, use

This article will introduce you to the php object-oriented _ call processing error calling skills. call is rarely used in the past. Let's test it today. Before talking about _ call, let's take a look at the test results of an instance to better

This article will introduce to you the PHP parent class to call subclass method instances. I hope this tutorial will be helpful to you. Today, we suddenly found that the subclass method needs to be called in the parent class, which has never been

Some of my friends will ask how the Session works. What is the difference between it and cookies? Next, let's introduce the working principle of the Session to all of you, for more information, see. 1. What is Session? 2. The Session starts when the

An array is a group of elements with some common characteristics, including similarity and type.Each element is distinguished by a special identifier, called a key, and each key has a value1. Two ways to create an array:1.1 Use the array () function

In php, the array can store values of any PHP type. If no key name is specified for the given value, the maximum integer index value is used, the new key name is the value plus one, which is the php array. There are three types of Arrays: Numeric