One blog per day | remove duplicate items from two-dimensional arrays in PHP

One blog per day | two-dimensional array removal of repeated items in PHP the array_unique function is provided in PHP to remove repeated items in one-dimensional array, but in our actual project development, the arrays queried from the select statement of the database are usually two-dimensional;

There may be repeated items, so we need to define the function to remove them.

Ideas:

1. first obtain the key name of the second-dimensional array and save it in an array (assuming the name is keyname_Arr );

2. use a symbol as a separator (for example, '-') to splice the key values in the two-dimensional array into a string to generate a temporary array;

3. use the [array_unique () function] to compare the generated temporary array and remove the same string;

4. re-assemble the array after deduplication into a two-dimensional array:

Use the [explode () function] cyclically in foreach () and split the string by the '-' separator;

At the same time, in foreach (), use a foreach ($ tempnew as $ tempk => $ tempv) for the [new temporary array tempnew] formed by the split string ),

Cyclic value assignment $ output [$ k] [$ keyname_Arr [$ tempk] = tempv;

6. finally, $ output is the two-dimensional array after deduplication.

Let's take a look at the actual code:

$ Keyname_Arr = array_keys (end ($ resource_arr )); // key name for storing the inner array // use '-' as the separator to concatenate the array into a string foreach ($ resource_arr as $ v) {$ v = join ("-", $ v); $ temp [] = $ v;} // remove the duplicate string, that is, the duplicate one-dimensional array $ temp = array_unique ($ temp ); // re-assemble the split array foreach ($ temp as $ k => $ v) {$ tempnew = explode ("-", $ v ); // split the string foreach ($ tempnew as $ tempkey => $ tempval) $ output [$ k] [$ keyname_Arr [$ tempkey] = $ tempval ;}

Cion. it is recorded on 2016/05/03.