php-Arrays function-array_intersect_key-calculate the intersection of arrays using key name comparison_PHP tutorial

array_intersect_key() uses key name comparison to calculate the intersection of arrays

【Function】
This function will return an array,
This array contains all values ​​in array1 that are not in any other parameter array.
【Scope of use】
​​​​​ php5>php5.1.0 .
【Use】
array array_intersect_key( array array1, array array2[,array...] )
           array1/required/array1
           array2/required/comparable array must have at least one
           array.../optional/array used for comparison
【Example】
[php]
//Define two arrays respectively
$array1 = array( "blue" => 6, "red" => 2, "green" => 3, "purple" => 4 );
$array2 = array( "green"=>5 , "blue" => 6, "yellow" => 7, "cyan" => 8 );
print_r( array_intersect_key( $array1, $array2 ) );
/*
Array
(
[blue] => 6
[green] => 3
)*/
[php]

Excerpted from zuodefeng’s notes

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