Here's how:
$arr = Array (...);//Suppose there are arrays of 10,000 elements with duplicate elements in them.
$arr = Array_flip (Array_flip ($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:
$arr 1 = Array ("Age" = +, "name" = "Happy Garden");
$arr 2 = array_flip ($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:
$arr 1 = Array ("Age" = +, "name" = "Happy Garden", "Age" and "age" = 20); "Age" = 20 will replace "age" + 30
$arr 1 = Array ("name" = "Happy Garden", "age" = 45);
Here $arr 1 are equal to the $ARR2.
As a result, we can see why Array_flip (Array_flip ($arr)) can delete duplicate elements in the array. First, the value in the $arr becomes the key name, because the value is duplicated, the duplicate value becomes the duplicate key name after the key name, and the PHP engine deletes the duplicate key name, leaving only the last one. Such as:
$arr 1 = Array ("Age" = +, "name" = "Happy Garden", "Age" and "age" = 20);
$arr 1 = array_flip ($arr 1); $arr 1 becomes an array ("Happy garden" = "name", "Age");
Then the key name and the value of the $arr 1 are also complex:
$arr 1 = array_flip ($arr 1);
The above code is concise: $arr 1 = array_flip (Array_flip ($arr 1));
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