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 php recursive loop through multidimensional array 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.

Applies the user-defined callback function to each element of the array. This function will recurse into deeper arrays. Typically, callback takes on two parameters. Note : If callback needs to be working with the actual values of the array, specify the first parameter of callback as a reference. Then, any changes made to those elements will be made in the original array itself. If the optional arg parameter is supplied, it will be passed as the third parameter to the callback. Returns true on success or false on failure.

Php recursive loop through multidimensional array

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. Version Description 7. Formerly, at least one parameter has been required. Submit a Pull Request Report a Bug. Parameters arrays Variable list of arrays to recursively merge. Return Values An array of values resulted from merging the arguments together. Changelog Version Description 7. This is a simple, three line approach. Short description: If one of the Arguments isn't an Array, first Argument is returned. This function didn't work for me - or it didn't do what I thought it would.

Note: This functionality php recursive loop through multidimensional array already provided by using the RecursiveIteratorIterator but is useful in understanding how to use the iterator when using for the first time as all the terminology does get rather confusing at first sight of SPL! The callback function isn't ever called for a nodes in the tree that subnodes i. 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.

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.

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.

Php recursive loop through multidimensional 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. The solution is to extend the RecursiveArrayIterator class and override the hasChildren method appropriately. Using the RecursiveArrayIterator to traverse an unknown amount of sub arrays within the outer array. Note: This functionality is already provided by using the RecursiveIteratorIterator but is useful in understanding how to use the iterator when using for the first time as all the terminology does get rather confusing at first sight of SPL!

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If this might apply to you, please see for yourself. If a value in the left one is an array and also an array in the right one, the function calls itself recursion. Even though you can pass array by reference, unsetting the value in the callback will only unset the variable in that scope. You can unset the current key, or add siblings, etc. If the array that you walk contains other array elements, they will be turned into references. You know how it works, it just turns it into an array with multiple values First Prev Next Nice phil. 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. 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. Of course this is presented as a simple example only, and is not a general solution. If it does, overwrite with second array value. Also note that this is actually what was suggested earlier -- the template file. It looks inefficient to me to do the same thing twice but in two different "languages". I wrote the following for merging arrays, in my project mainly for configuration Here's the tip: Don't return any value from the function!

Applies the user-defined callback function to each element of the array.

Back to top. Even though you can pass array by reference, unsetting the value in the callback will only unset the variable in that scope. As with all things, its usually easier to write your own, which I did and it seems to work just the way I wanted. Anyways, my function hasn't been tested extensively, but it's a simple function, so in hopes that this might be useful to someone else I'm sharing. This function didn't work for me - or it didn't do what I thought it would. I'm really a noob :'. Then, any changes made to those elements will be made in the original array itself. 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. Note: This functionality is already provided by using the RecursiveIteratorIterator but is useful in understanding how to use the iterator when using for the first time as all the terminology does get rather confusing at first sight of SPL! If a value in the left one is an array and also an array in the right one, the function calls itself recursion. Posted: Fri Jun 07, pm Post subject:. 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.