Definition and usage
array_diff_assoc() function is used to compare the key names and key values of two (or more) arrays and return the difference set.
This function compares the key names and key values of two (or more) arrays, and returns a difference array, which includes everything in the compared array (array1), but not in any other The key name and key value in the parameter array (array2 or array3, etc.).
Example:
Compare the keys and values of two arrays and return the difference set:
<!DOCTYPE html>
<html>
<body><?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");
$result=array_diff_assoc($a1,$a2);
print_r($result);
?></body>
</html>Running result:
Array ( [d] => yellow )
Syntax
array_diff_assoc(array1,array2,array3...);
Parameter introduction:
array1 is required. The first array to compare with other arrays.
array2 Required. The array to compare to the first array.
array3,... Optional. Additional array to compare with the first array.
Return value: Returns an array that contains all key names and key values that are in array1 but are not in any other parameter array (array2 or array3, etc.).
Example:
Compare the keys and values of three arrays and return the difference set:
<!DOCTYPE html>
<html>
<body><?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","f"=>"green","g"=>"blue");
$a3=array("h"=>"red","b"=>"green","g"=>"blue");
$result=array_diff_assoc($a1,$a2,$a3);
print_r($result);
?></body>
</html>Running results
Array ( [c] => blue [d] => yellow )
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