PHP code to delete array and two-dimensional array values

Here's how:

1. $arr = Array (...);//Suppose there are arrays of 10,000 elements with duplicate elements in them.
2. $arr = Array_flip (Array_flip ($arr)); This allows you to remove duplicate elements.

What the hell is going on here? Take a look at the role of Array_flip (): Array_flip () is used to exchange the key and value of each element of an array, such as:

1. $arr 1 = Array ("Age" = +, "name" = "Happy Garden");
2. $arr 2 = array_flip ($arr 1); $arr 2 is the array ("Age", "happy garden" = "name");

In an array of PHP, allow different elements to take the same value, but not allow the same key name to be used by different elements, such as:

1. $arr 1 = Array ("Age" = +, "name" = "Happy Garden", "Age" and "age" = 20); "Age" = 20 will replace "age" + 30
2. $arr 1 = Array ("name" = "Happy Garden", "age" = 45);

Here $arr 1 is equal to $ARR2, so we can see why Array_flip (Array_flip ($arr)) can delete the duplicate elements in the array, first, the value in the $arr becomes the key name, because the value is duplicated, After becoming a key name, these duplicate values become duplicate key names, and the PHP engine deletes the duplicate key names, leaving only the last one. Such as:

1. $arr 1 = Array ("Age" = +, "name" = "Happy Garden", "Age" and "age" = 20);
2. $arr 1 = array_flip ($arr 1); $arr 1 becomes an array ("Happy garden" = "name", "Age");
3. Then the key name and the value of the $arr 1 are also complex:
4. $arr 1 = array_flip ($arr 1);

The above code is concise: $arr 1 = array_flip (Array_flip ($arr 1));

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PHP code to delete array and two-dimensional array values