How php changes the name of an array index

This article mainly introduces "php how to change the array index name", in daily operation, I believe many people in php how to change the array index name problem there are doubts, Xiaobian consulted all kinds of information, sorted out simple and easy to use operation methods, hope to answer "php how to change the array index name" doubts helpful! Next, please follow the small series to learn together!

In php, you can change the index name of an array using the array_combine() function, which changes the index by taking the element value of another array as the index (key) of the original array; syntax "array_combine($keys,$arr)".

Operating environment of this tutorial: Windows 7 system, PHP7.1 version, DELL G3 computer

How does PHP change array index names?

For example, there is such an array:

$arr=array("red","green","blue","yellow");

How to modify its index name?

In PHP, this can be done using the array_combine() function.

The array_combine() function creates a new array by combining two arrays, one with keys and the other with keys.

We just need to create an array of keys, which contains the modified index name, and then the original array as a key array, the two arrays can be merged using array_combine().

Note: The number of elements in the key name array and the key value array must be the same!

Examples:

Key name array is:

$keys=array("a","b","c","d");

Use the array_combine() function to replace the keys of the $arr array with the values of the $keys array:

At this point, the study of "how to change the array index name in php" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!