How to merge different array elements in php

php method to merge different array elements: 1. Create a PHP sample file; 2. Use "array_keys(array_flip($a) array_flip($b) array_flip($c));" to multiple Just merge the arrays to remove duplicates.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How does php merge different array elements?

Multiple array deduplication

array_keys(array_flip($arr1)+array_flip($arr2))

array_keys() function returns a new array containing all the key names in the array.

If the second parameter is provided, only the key name with the key value is returned.

Return a new array containing all the key names in the array:

<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
print_r(array_keys($a));
?>

Running results:

Array ( [a] => red [b] => green )
Array ( [0] => Volvo [1] => BMW [2] => Toyota )

Techniques for merging and deduplicating multiple arrays

$a = array('1001','1002');
$b = array('1002','1003','1004');
$c = array('1003','1004','1005');
$d = array_keys(array_flip($a) + array_flip($b) + array_flip($c));

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