Shulou(Shulou.com)06/03 Report--

This article will explain in detail how php uses the foreach statement to modify key values. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Php uses the foreach statement to modify the key value: 1, use the "foreach ($array as & $value)" statement to traverse the array, in each loop the key value of the current array is assigned to the variable "$value"; 2, in the body of the loop, using the "=" operator, assign the value on the right to the variable "$value" on the left.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Foreach is a statement specially designed to traverse an array. It is a common method when traversing an array and provides great convenience in traversing an array. After PHP5, you can also traverse objects (foreach can only be applied to arrays and objects).

The foreach statement traverses an array independent of the array subscript and can be used for discontiguous indexed arrays and associative arrays with strings as subscript.

Each time the foreach statement loops, the pointer inside the array moves forward so that the next array element is obtained in the next loop until it traverses to the end of the array, stops traversing and exits the loop.

How does php use the foreach statement to modify key values?

Output result:

Note: add & before $value so that the foreach statement assigns a value by reference rather than copying a value, and manipulating the array inside the loop affects the array itself.

It is important to note that the $value reference to the last element of the array remains after the foreach loop. We need to use unset () to destroy it.

This is the end of the article on "how php uses the foreach statement to modify key values". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.