php-Arrays function-array_intersect_uassoc-calculates the intersection of arrays with index check and compares the indexes with callback function_PHP tutorial

array_intersect_uassoc() calculates the intersection of arrays with index checking, and uses the callback function to compare the indexes

【Function】
This function will return an array,
This array contains all values ​​in array1 that are not in any other parameter array.
                           Note that unlike the array_intersect() function, key names are also used for comparison.
【Scope of use】
​​​​ php5.
【Use】
array array_intersect_assoc( array array1, array array2[,array...,callback key_compare_func] )
           array1/required/array1
           array2/required/comparable array must have at least one
           array.../optional/array used for comparison
            key_compare_func.../optional/provides users with a callback function as a comparison standard
【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_uassoc( $array1, $array2, "strcasecmp" ) );
/*
Array
(
[blue] => 6
)
*/

Excerpted from zuodefeng’s notes