PHP: array_change_ key_case() function

January 5, 2019

In this, Tutorial We are Learning How to convert array values to lowearcase or How to Convert array values in Uppercase using array_change_ key_case() function in PHP.

The array_change_ key_case() function is used to Change all array keys to lower case or upper case. This is Avaible in Php 4 version and Above Version.

The array_change_ key_case() function returns an array with all keys in lowercase or uppercase.

array_change_ key_case() with Uppercase

The Following is an Example to convert all keys to uppercase

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array_change_ key_case() with Lowercase

The Following is an Example to convert all keys to Lowercase

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This is the Use and Syntax of array_change_ key_case() function


If Two or more keys will be equal after running array_change_key_case() (e.g. “a” and “A”), the latest array will override the other:

Input Code


There are two Same key after using the array_change_key_case() then last value is override the Other Values.

For More Detail about this Function You have to Read this PHP Function.

Hope this Helps.

Karan Suthar

Surat, India

I'm Karan, the creator Behind the KTechBlog. I write Blogs in my Free Time. I ❤ to learn new Technologies and Share with Others. I'm Trying best effort to make KTechBlog useful for Everyone.