It returns the resulting If the input arrays have the same string keys, then the values for Instead of override the keys,
Tip: The difference between this function and the
This implementation preserves the parameter input from the original, you can pass an infinite amount of array's to merge. these keys are merged together into an array, and this is done Needed some way to fuse two arrays together and found a function here (below from thomas) and decided to update it even further to be a little more smart.
when two or more array elements have the same key. Note that if you want to append one array to another, using a foreach in conjuction with array_push is A LOT faster: foreach loop is faster than array_merge to append values to an existing array, so choose the loop instead if you want to add an array to the end of another. SQL
Merge two associative arrays into one array: Using only one array parameter with integer keys: HTML
The array_merge function does not preserve numeric key values.
The PHP array_combine function creates a new array from two arrays that you pass as arguments to it. Reiterating the notes about casting to arrays, be sure to cast if one of the arrays might be null: if you generate form select from an array, you probably want to keep your array keys and order intact. The documentation is a touch misleading when it says: "If only one array is given and the array is numerically indexed, the keys get reindexed in a continuous way."
The array_merge() function used to merge one or more arrays.
XML. There are possibilities where a numeric key is actually a string '123', // croak on not enough arguemnts (we need at least two), // if last is not array, then assume it is trigger for key is always string, // check that arrays count is at least two, else we don't have enough. the function returns a new array with integer keys starting at 0 and increases by 1 for each value (See
In that case ('3') is consider as numeric and generating new numeric key instead of replacing by second one to first one. Thought someone else might find it usefull. This recursive array merge function doesn't renumber integer keys and appends new values to existing ones OR adds a new [key => value] pair if the pair doesn't exist. I've edit this version even a little bit more, so that the function does not override any values, but inserts them at a free key in the array: I would merge 2 arrays but keep the values unique in the result array. This emulates replace of $_REQUEST according to variable_order=GPC. If called without any arguments, returns an empty array. to the end of the previous one. For example: The function behaves differently with numbers more than PHP_INT_MAX. ', // the first array is in the output set in every case, // integer or string as integer key - append, // if $ret[$key] is not an array you try to merge an scalar value with an array - the result is not defined (incompatible arrays). value will not overwrite the original value, but will be appended. // result: Array ( [name] => Metehan [surname] => Arslan [age] => 28 [favs] => Array ( [language] => js [planet] => mercury [city] => shanghai ) ), // First array is used as the base, everything else overwrites on it, // Numeric keyed values are added (unless already there).
JavaScript
If you want to append array elements from the second array to the Values in the input arrays with numeric keys will be renumbered with // this function merges an array with the $_SESSION. to get unique value from multi dimensional array use this instead of array_unique(), because array_unique() does not work on multidimensional: I constantly forget the direction of array_merge so this is partially for me and partially for people like me. Although it may not be apparent, if using array_merge_recursive in a loop to combine results from a database query or some other function, you can corrupt your result when NULLs are present in the data. In some situations, the union operator ( + ) might be more useful to you than array_merge. one are appended to the end of the previous one. In this version the values are overwritten only if they are not an array. Returns the resulting array. Nice for merging configurations. contain numeric keys, the later value will not overwrite the original value, but will be An addition to what Julian Egelstaff above wrote - the array union operation (+) is not doing an array_unique - it will just not use the keys that are already defined in the left array. Example #3 array_merge() with non-array types.
This is not that. Note that if you use + to merge array in order to preserve keys, that in case of duplicates the values from the left array in the addition is used. If the input arrays have matching string keys, then the later value will override it's the previous counterpart. I ran into a fairly unique situation where array_merge_recursive ALMOST did what I wanted, but NOT QUITE. I read through all of the comments, and I didn't find anything that really helped me.
Bootstrap
If, however, the arrays have the same numeric key, the later Array merge will return null if any parameter not an array. It returns the resulting array. exists in both arrays, then the element from the first array will
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