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Compares the keys from array against the keys from arrays and returns the difference. This function is like array_diff () except the comparison is done on the keys instead of the values.
Definition and Usage The array_diff_key () function compares the keys of two (or more) arrays, and returns the differences. This function compares the keys of two (or more) arrays, and return an array that contains the entries from array1 that are not present in array2 or array3, etc.
Sep 22, 2025 · This function compares the keys between one or more arrays and returns the difference between them. So, the function generally compares two arrays according to their keys and returns the elements that are present in the first array but not in other input arrays.
PHP array_diff_key() function computes the difference of an array against other arrays based on keys. Only key/index of the arrays is used for comparison. In this tutorial, we will learn the syntax of array_diff_key(), and how to use this function to find the difference of an array from other arrays based on keys, covering different scenarios based on array type and arguments.
Here're some more examples showing how array_diff_key() function actually works: In the following example this function compares an array against two other arrays.
- PHP 5.1.0+
The PHP array_diff_key function compares array keys and returns the differences. It's useful for finding keys that exist in one array but not others. Basic Definition The array_diff_key function compares keys of multiple arrays. It returns an array containing all entries from the first array whose keys are not present in any of the other arrays.
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array_diff_key Function • Params and return types changed in PHP 8.0 Computes the difference of arrays using keys for comparison.
