![]() ![]() Maybe PHP 7 will fix this madness, but at time of writing the stock PHP versions in Debian Jessie and Ubuntu Wily behave as outlined above.Īnyway, the short version is that you can avoid this by adding unset( $value ) immediately after the first foreach. My intuition strongly suggests to me that $value should go out of scope after the first foreach loop, but apparently my intuition is wrong. It is recommended to destroy it by unset().” As the PHP documentation states, “Reference of a $value and the last array element remain even after the foreach loop. The reason is that the first foreach loop passes values by reference ( &$value) while the second passes them by value ( $value). ![]() Okay, so it’s not really inexplicable, just very unexpected. Yes, that’s right, the final key inexplicably appears to have the same value as the previous key, despite print_r suggesting otherwise. If you also expected that, you would be wrong. Now, call me crazy, but I expect both the print_r call and the second foreach loop to return pretty much the same information: the keys, a to f, and their corresponding values, 1 to 6. Consider this slightly contrived example code: I just spent a couple of hours debugging something really counterintuitive, where PHP’s print_r seemingly told me that an array had different content to the content that the same array contained according to a foreach loop. You can also use the arraysplice() method to remove. * string $fields The names of the keys or properties to remove.įunction deep_unset_all( array|object &$data. The short answer is to use the unset() function of PHP that takes array variable with key as an argument. You can not unset a numeric key of an array, if key is a string. * Unsets all array keys and object properties of the given names. This function lets you specify a variable number of fields to remove altogether! /** Deep Unset Multiple FieldsĪdditionally, you may want to recursively unset multiple fields at once. * string $prop The name of the property to remove.įunction deep_unset_prop( array|object &$data, string $prop ) Example Usage deep_unset( $employees, 'id' ) // Remove all "id" properties and keys. * array|object $data An iterable object or array to modify. * Unsets object properties of the given name. Use this function when you want to only unset a specific property in every object instance. This means the following functions may be safely called without preliminary deep checks. Note that PHP’s unset() function doesn’t throw an error or warning when given non-existent fields. Unsetting array values in a foreach loop duplicate Ask Question Asked 13 years, 4 months ago Modified 2 years, 3 months ago Viewed 152k times 77 This question already has answers here: How do you remove an array element in a foreach loop (7 answers) Closed 6 years ago. After going through the first foreach loop, array remains unchanged but, as explained above, value is left as a dangling reference to the last element in. This makes the functions much more efficient! By passing a variable by reference, the function makes direct modifications to that variable’s value rather than returning a modified copy. ![]() This is how to pass variables by reference in PHP. Notice that an ampersand (&) precedes the first parameter in each of the following functions. ![]() To cover all cases, I’ve written the four different functions (plus a bonus, fifth function) that you need to recursively unset data fields. Sometimes SDKs will parse data into objects while other SDKs will return data as associative arrays. Now, there are two different ways to represent maps (key-value pairs) in PHP: objects and arrays. That’s why I wrote some functions to recursively unset fields in my multi-dimensional datasets! Since the frontend didn’t need these IDs, I wanted to strip them before passing the dataset back to the frontend. This function also returns the removed element of the array and returns. The server-side requests to the API return nested records, each with their own resource IDs. To remove the first element or value from an array, arrayshift() function is used. Recently, I implemented a frontend UX that asynchronously loads data from an API. ![]()
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