Php recursive loop through multidimensional array

Recently I found myself in a situation where I needed to search and remove a value from a dynamically generated multidimensional array with a different size and length. After many trials and errors, I found that the best solution is to recursively loop through the array and locate and remove the value. First thing we're doing is checking if the array passed to the function is actually an array.

This iterator allows for unsetting and modifying values and keys while iterating over arrays and objects, in the same way as the ArrayIterator. Additionally, it is possible to iterate over the current iterator entry. RecursiveArrayIterator::getChildren ». Submit a Pull Request Report a Bug. If you are iterating over a multi-dimensional array of objects, you may be tempted to use a RecursiveArrayIterator within a RecursiveIteratorIterator. You are likely to get baffling results if you do. That is because RecursiveArrayIterator treats all objects as having children, and tries to recurse into them.

Php recursive loop through multidimensional array

I'm completly lost after wasting like 10hours on this. I don't know how to proceed, and my website not made by me initially process all smarty through php, so it never includes a smarty file directly in a template And can you show me an example? Going into recursing, the level is incremented, and having come out from recursing, the level is decremented. Also note that this is actually what was suggested earlier -- the template file. Now I can analyse your code! But it appears you need it. Just curious - what exact version of Smarty are you using? Is it normal that I have to do a recursive looping in PHP to create the array, then do the same recursive looping in Smarty to display it properly?? PHP is your business logic, Smarty is your presentation logic. This forum will be closing soon. Recursive loop from a hierarchical multidimensional array Goto page 1 , 2 Next.

And as of PHP 5.

It returns the resulting array. If the input arrays have the same string keys, then the values for these keys are merged together into an array, and this is done recursively, so that if one of the values is an array itself, the function will merge it with a corresponding entry in another array too. If, however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended. An array of values resulted from merging the arguments together. If called without any arguments, returns an empty array.

Search through a multi-dimensional array for a specific key or value and replace the value in the original array using recursive functions. Finding and replacing values in a multi-dimensional array can be quite a challenge, especially when the structure, size and dimensions of the array are unpredictable. Finding the key or value you are looking for within a multi-dimensional array is not too difficult; you can create a recursive function to iterate over every dimension within your array and scan keys or non-array elements for the value you're looking for, but replacing the value in the original array is the real challenge. There are several ways you could go about solving this issue such as keeping track of the location of target values and replacing them afterwards, but this could be difficult and messy. A more suitable way is to make use of references in your function in order to directly modify values within your original array. In a nutshell, references are parameters that cause the variable given as an argument to change its value whenever the reference's value changes. The above code contains two functions, both of which have one parameter that is incremented. One of the functions uses a reference, the other does not. The easiest way to find a specific key or value within a multi-dimensional array would be to create a recursive function that iterates through a given array and looks for the target element.

Php recursive loop through multidimensional array

You can walk across one-dimensional array simply, but may laboriously loop through multidimensional array in PHP using recursive methods. Truly, the multidimensional features in data need more efforts for traversal of array. Obviously, recursive methods involve many types of applications such as traversing files in a directory, Towers of Hanoi, types of Tree Traversal and so on. All codes here are not complicated, so you can easily understand even though you are still students in school. To benefit your learning, we will provide you download link to a zip file thus you can get all source codes for future usage.

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Parameters array The input array. If the optional arg parameter is supplied, it will be passed as the third parameter to the callback. I was looking for a function like this one : merge one ore more arrays without appending values, just override and extend the array if needed. If you desire correct and performant behaviour in contrast to the other postings use this code. It actually took me a while to figure out why my function wasn't changing the original array, even though I was passing by reference. I don't know how to proceed, and my website not made by me initially process all smarty through php, so it never includes a smarty file directly in a template And can you show me an example? Assume your array had the DB column names first, last, and age and you needed to combine the data in a multi-dimensional array in which the column name is an array key with all rows beneath it. Going into recursing, the level is incremented, and having come out from recursing, the level is decremented. Here's a more general solution to modifying the array to which the leaf belongs. Here i used "::delete::" as reserved word to delete items. This function has a serious bug, which is still not fixed as of the PHP 5. Return Values An array of values resulted from merging the arguments together. Default is that keys are all string.

Buckle up, fellow PHP enthusiast! We're loading up the rocket fuel for your coding adventures I have read the PHP documentation, but I'm still a bit confused about how exactly it works.

Oh, it ran your function recursively alright, but changed all the values in the local function scope only and returns a boolean as the documentation states. Unfortunately the PHP example given doesn't do this. Go to top. This is a simple example that lacks any DB calls and looping. RecursiveArrayIterator::getChildren ». The description says "If funcname needs to be working with the actual values of the array, specify the first parameter of funcname as a reference. If, however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended. This implementation preserves the parameter input from the original, you can pass an infinite amount of array's to merge. It returns the resulting array. Sign in Email. It looks inefficient to me to do the same thing twice but in two different "languages".