How to use PHP array to print subscripts_PHP tutorial

When learning PHP arrays, you may encounter many problems. Here we will introduce the solutions to PHP array problems and share them with you here. Start learning php. I have always subjectively believed that programming refers to writing applications in languages ​​​​such as C and C++. I have always stayed away from web pages. But as a system administrator, if the website to be maintained is PHP, it is not enough to solve system problems. In order to solve the needs, you still need to be able to understand some PHP syntax.

So I looked at php "secretly". During the learning process, I discovered that PHP can also write scripts. Isn’t this the best of both worlds? I only learn the scripting part of PHP for system management, so that I can become familiar with PHP syntax and modify some web pages when necessary. I don’t know if I am the first person to use php scripts for system management. Hey, if you can solve the problem, that’s the way to go.

Due to workflow reasons, after a colleague writes something, I need to update it to the server, and then my colleague can check the effect. There is no problem in doing this. But for colleagues, they may always "trouble" me every time they modify something, and they will feel bad about it. As for me, in order to save trouble, I wrote a script for what my colleague asked me to do. When he asked me to update, I connected to the server and executed the script directly.

So I was thinking: How can my colleagues do this directly without going through me? It is unrealistic to open permissions on the server, because the smaller the server management permissions, the better. When the department boss suggested writing a page for colleagues to do it themselves, I said that I already had this idea, but once the process was clear, I wouldn’t write the button to click on the page. The boss said, this is simple, so he divided three by five, each with only one button. After clicking, the page that can output the execution results was written. And this button can be clicked an unlimited number of times. This saves you the trouble of revisiting this page every time. After giving it to my colleagues, guess what? My colleague actually said excitedly: "This little innovation of yours will really benefit all mankind!" Haha, although I didn't say anything, I was actually already happy in my heart. This can be regarded as a small incentive for me to learn PHP as a beginner, come on!

I’ve been talking nonsense for a long time. Actually, I just want to share with you how to print array subscripts in PHP. When I saw PHP's foreach function, I thought it was similar to Perl's foreach, but when I open a file and output it, I hope to print out the label of each line. Perl has many built-in functions. To achieve this function, just use $.. Is it not possible in php? After searching for a long time to no avail, I asked several friends who write PHP and they just said that I need to define a variable in advance and then print the variable. It seemed that there was no other way, so I continued to look at the grammar. When seeing a two-dimensional array. Once I accidentally printed out a one-dimensional array in the same way as a two-dimensional array, and suddenly I discovered this secret that must be told! Look at the picture:

Needless to say the content, first create a PHP array consisting of ten numbers, and then output the result.

See Is there any execution result? Are the array subscripts printed correctly? It seems that PHP is also very powerful, very pornographic and violent. That’s it for today’s sharing. It’s not a dessert, it’s just a heresy at best:)

http://www.bkjia.com/PHPjc/446453.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446453.htmlTechArticleWhen learning PHP arrays, you may encounter many problems. Here we will introduce the solutions to PHP array problems. Take it out here and share it with everyone. Start learning php. I have always considered it subjectively...