COMPUTES the difference between ARRAYS with additional index check.
<?php
arr array_diff_assoc ( arr $array1 ,
arr $array2 [, arr $arra3, ..., arr $arrayN ] )
where,
$array1 = The first ARRAY to compare from
$array2 = The second ARRAY to compare against
$array3 = The third ARRAY to compare against
. . . . . . . . . . . . .
$arrayN = The last ARRAY to compare against
?>
EXERCISE
<?php
$arra01a = [ "Real Madrid Club de Fútbol",
"Fútbol Club Barcelona",
"Club Atlético de Madrid",
"Deportivo Alavés",
"Getafe Club de Fútbol" ];
$arra01b = [ "Club Atlético de Madrid",
"Deportivo Alavés",
"Getafe Club de Fútbol" ];
$arra01c = [ "Rayo Vallecano de Madrid",
"Real Betis Balompié",
"Real Valladolid Club de Fútbol" ];
echo 'The first given ARRAY<br>';
var_dump($arra01a);
echo '<br><br>The second given ARRAY<br>';
var_dump($arra01b);
echo '<br><br>The third given ARRAY<br>';
var_dump($arra01c);
$arra01abc1 =
array_diff_assoc($arra01a, $arra01b, $arra01c);
echo '<br><br>After
array_diff_assoc($arra01a, $arra01b, $arra01c):<br>';
var_dump($arra01abc1);
$arra01abc2 =
array_diff_assoc($arra01a, $arra01c, $arra01b);
echo '<br><br>After
array_diff_assoc($arra01a, $arra01c, $arra01b):<br>';
var_dump($arra01abc2);
$arra01abc3 =
array_diff_assoc($arra01b, $arra01c, $arra01a);
echo '<br><br>After
array_diff_assoc($arra01b, $arra01c, $arra01a):<br>';
var_dump($arra01abc3);
$arra01abc4 =
array_diff_assoc($arra01c, $arra01a, $arra01b);
echo '<br><br>After
array_diff_assoc($arra01c, $arra01a, $arra01b):<br>';
var_dump($arra01abc4);
?>
EXERCISE
<?php
$arra02a = [ "Real Madrid Club de Fútbol",
"Fútbol Club Barcelona",
"Club Atlético de Madrid",
"Deportivo Alavés",
"Getafe Club de Fútbol" ];
$arra02b = [ "CLUB ATLÉTICO DE MADRID",
"DEPORTIVO ALAVÉS",
"GETAFE CLUB DE FÚTBOL" ];
$arra02c = [ "Rayo Vallecano de Madrid",
"Real Betis Balompié",
"Real Valladolid Club de Fútbol" ];
echo 'The first given ARRAY<br>';
var_dump($arra02a);
echo '<br><br>The second given ARRAY<br>';
var_dump($arra02b);
echo '<br><br>The third given ARRAY<br>';
var_dump($arra02c);
$arra02abc1 =
array_diff_assoc($arra02a, $arra02b, $arra02c);
echo '<br><br>After
array_diff_assoc($arra02a, $arra02b, $arra02c):<br>';
var_dump($arra02abc1);
$arra02abc2 =
array_diff_assoc($arra02a, $arra02c, $arra02b);
echo '<br><br>After
array_diff_assoc($arra02a, $arra02c, $arra02b):<br>';
var_dump($arra02abc2);
$arra02abc3 =
array_diff_assoc($arra02b, $arra02c, $arra02a);
echo '<br><br>After
array_diff_assoc($arra02b, $arra02c, $arra02a):<br>';
var_dump($arra02abc3);
$arra02abc4 =
array_diff_assoc($arra02c, $arra02a, $arra02b);
echo '<br><br>After
array_diff_assoc($arra02c, $arra02a, $arra02b):<br>';
var_dump($arra02abc4);
?>
EXERCISE
<?php
$arra03a = [ 'Madrid' => "Real Madrid Club de Fútbol",
'Barcelona' => "Fútbol Club Barcelona",
'Villarreal' => "Villarereal Club de Fútbol" ];
$arra03b = [ 'Madrid' => "REAL MADRID CLUB DE FÚTBOL",
'Barcelona' => "Fútbol Club Barcelona" ,
'Vitoria' => "Deportivo Alavés",
'Getafe' => "Getafe Club de Fútbol" ];
$arra03c = [ 'Madrid' => "Rayo Vallecano de Madrid",
'Sevilla' => "Real Betis Balompié",
'Valladolid' => "Real Valladolid Club de Fútbol" ];
echo 'The first given ARRAY<br>';
var_dump($arra03a);
echo '<br><br>The second given ARRAY<br>';
var_dump($arra03b);
echo '<br><br>The third given ARRAY<br>';
var_dump($arra03c);
$arra03abc1 =
array_diff_assoc($arra03a, $arra03b, $arra03c);
echo '<br><br>After
array_diff_assoc($arra03a, $arra03b, $arra03c):<br>';
var_dump($arra03abc1);
$arra03abc2 =
array_diff_assoc($arra03a, $arra03c, $arra03b);
echo '<br><br>After
array_diff_assoc($arra03a, $arra03c, $arra03b):<br>';
var_dump($arra03abc2);
$arra03abc3 =
array_diff_assoc($arra03b, $arra03c, $arra03a);
echo '<br><br>After
array_diff_assoc($arra03b, $arra03c, $arra03a):<br>';
var_dump($arra03abc3);
$arra03abc4 =
array_diff_assoc($arra03c, $arra03a, $arra03b);
echo '<br><br>After
array_diff_assoc($arra03c, $arra03a, $arra03b):<br>';
var_dump($arra03abc4);
?>
?>
EXERCISE
<?php
$array1 = array("a" => "green", "b" => "brown",
"c" => "blue", "red", "");
$array2 = array("a" => "green", "yellow", "red", TRUE);
$array3 = array("red", "a"=>"brown", "");
echo 'The first given ARRAY<br>';
var_dump($array1);
echo '<br><br>The second given ARRAY<br>';
var_dump($array2);
echo '<br><br>The third given ARRAY<br>';
var_dump($array3);
$result[] = array_diff_assoc($array1, $array2);
$result[] = array_diff_assoc($array1, $array3);
$result[] = array_diff_assoc($array2, $array3);
$result[] = array_diff_assoc($array1, $array2, $array3);
echo '<br><br>The resulting ARRAY<br>';
print_r($result);
?>
EXERCISE
<?php
/*
* Test basic functionality of
* array_diff_assoc
*/
echo "Testing array_diff_assoc() : basic functionality:<br><br>";
$array_default_key = array('one', 2, 'three', '4');
$array_numeric_key = array(1 => 'one', 2=> 'two', 3 => 4);
$array_string_key = array('one' => 1, 'two' => '2', '3' => 'three');
echo 'The first given ARRAY<br>';
var_dump($array_default_key);
echo '<br><br>The second given ARRAY<br>';
var_dump($array_numeric_key);
echo '<br><br>The third given ARRAY<br>';
var_dump($array_string_key);
echo "<br><br><br>Compare Default keys to numeric keys.<br><br>";
echo 'After array_diff_assoc($array_default_key,
$array_numeric_key):<br>';
var_dump(array_diff_assoc($array_default_key,
$array_numeric_key));
echo '<br><br>After array_diff_assoc($array_numeric_key,
$array_default_key):<br>';
var_dump(array_diff_assoc($array_numeric_key,
$array_default_key));
echo "<br><br>Compare Default keys to string keys.<br><br>";
echo 'After array_diff_assoc($array_default_key,
$array_numeric_key):<br>';
var_dump(array_diff_assoc($array_default_key,
$array_numeric_key));
echo '<br><br>After array_diff_assoc($array_numeric_key,
$array_default_key):<br>';
var_dump(array_diff_assoc($array_numeric_key,
$array_default_key));
echo "<br><br>Compare numeric keys to string keys.<br><br>";
echo 'After array_diff_assoc$array_numeric_key,
$array_string_key):<br>';
var_dump(array_diff_assoc($array_numeric_key,
$array_string_key));
echo '<br><br>After array_diff_assoc($array_string_key,
$array_numeric_key):<br>';
var_dump(array_diff_assoc($array_string_key,
$array_numeric_key));
?>
EXERCISE
<?php
/*
* Test how array_diff_assoc()
* compares binary data
*/
echo " Testing array_diff_assoc() : usage variations.<br><br>";
$array1 = array( b"1",
b"hello",
"world",
"str1" => "hello",
"str2" => "world");
$array2 = array( b"1" => 'hello',
b"world",
"hello",
'test');
echo 'The given $array1:<br>';
var_dump($array1);
echo '<br><br>The given $array2:<br>';
var_dump($array2);
echo '<br><br><br>After array_diff_assoc($array1, $array2):<br>';
var_dump(array_diff_assoc($array1, $array2));
echo '<br><br>After array_diff_assoc($array2, $array1):<br>';
var_dump(array_diff_assoc($array2, $array1));
?>
EXERCISE
<?php
/*
* Test how array_diff_assoc()
* compares arrays containing different
* data types as keys
*/
echo "Testing array_diff_assoc() : usage variations.<br><br>";
$array = array(1, 2, 3);
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// heredoc string
$heredoc = <<<EOT
hello world
EOT;
//Different data types as keys to be passed to $arr1 argument
$inputs = array(
// int data
/*1*/
'int' => array(
0 => 'zero',
1 => 'one',
12345 => 'positive',
-2345 => 'negative'),
// float data
/*2*/
'float' => array(
10.5 => 'float 1',
-10.5 => 'float 2',
.5 => 'float 3'),
// null data
/*3*/
'null' => array(
NULL => 'null 1',
null => 'null 2'),
// boolean data
/*4*/
'bool' => array(
true => 'boolt',
false => 'boolf',
TRUE => 'boolT',
FALSE => 'boolF'),
// empty data
/*5*/
'empty' => array(
"" => 'emptyd',
'' => 'emptys'),
// string data
/*6*/
'string' => array(
"string" => 'stringd',
'string' => 'strings',
$heredoc => 'stringh'),
// binary data
/*7*/
'binary' => array(
b"binary1" => 'binary 1',
(binary)"binary2" => 'binary 2'),
// undefined data
/*8*/
'undefined' => array(
@$undefined_var => 'undefined'),
// unset data
/*9*/
'unset' => array(
@$unset_var => 'unset'),
);
echo 'The given $array:<br>';
var_dump($array);
echo '<br><br>The given $inputs:<br>';
var_dump($inputs);
// loop through each element of $inputs
// to check the behavior of array_diff_assoc
$iterator = 1;
foreach($inputs as $key => $input) {
echo "<br><br>Iteration: $iterator<br>";
var_dump( array_diff_assoc($input, $array));
$iterator++;
};
?>
EXERCISE
<?php
/*
* Test how array_diff_assoc
* compares integers, floats and string
*/
echo "Testing array_diff_assoc() : usage variations.<br><br>";
$arr_default_int = array(1, 2, 3, 'a');
$arr_float = array(0 => 1.00, 1.00 => 2.00, 2.00 => 3.00, 'b');
$arr_string = array('1', '2', '3', 'c');
$arr_string_float = array('0' => '1.00',
'1.00' => '2.00',
'2.00' => '3.00', 'd');
echo 'The given $arr_default_int:<br>';
var_dump($arr_default_int);
echo '<br><br>The given $arr_float:<br>';
var_dump($arr_float);
echo '<br><br>The given $arr_string:<br>';
var_dump($arr_string);
echo '<br><br>The given $arr_string_float:<br>';
var_dump($arr_string_float);
echo "<br><br><br>Result of comparing
integers and floating point numbers.<br>";
echo 'After array_diff_assoc($arr_default_int, $arr_float):<br>';
var_dump(array_diff_assoc($arr_default_int, $arr_float));
echo '<br><br>After
array_diff_assoc($arr_float, $arr_default_int):<br>';
var_dump(array_diff_assoc($arr_float, $arr_default_int));
echo "<br><br><br>Result of comparing
integers and strings containing an integers.<br>";
echo 'After array_diff_assoc($arr_default_int, $arr_string):<br>';
var_dump(array_diff_assoc($arr_default_int, $arr_string));
echo '<br><br>After
array_diff_assoc($arr_string, $arr_default_int):<br>';
var_dump(array_diff_assoc($arr_string,
$arr_default_int));
echo "<br><br><br>Result of comparing
integers and strings containing floating points.<br>";
echo 'After
array_diff_assoc($arr_default_int, $arr_string_float):<br>';
var_dump(array_diff_assoc($arr_default_int,
$arr_string_float));
echo '<br><br>After
array_diff_assoc($arr_string_float, $arr_default_int):<br>';
var_dump(array_diff_assoc($arr_string_float,
$arr_default_int));
echo "<br><br><br>Result of comparing
floating points and strings containing integers.<br>";
echo 'After
array_diff_assoc($arr_float, $arr_string):<br>';
var_dump(array_diff_assoc($arr_float, $arr_string));
echo '<br><br>After
array_diff_assoc($arr_string, $arr_float):<br>';
var_dump(array_diff_assoc($arr_string, $arr_float));
echo "<br><br><br>Result of comparing floating
points and strings containing floating point.<br>";
echo 'After
array_diff_assoc($arr_float, $arr_string_float):<br>';
var_dump(array_diff_assoc($arr_float, $arr_string_float));
echo '<br><br>After
array_diff_assoc($arr_string_float, $arr_float):<br>';
var_dump(array_diff_assoc($arr_string_float, $arr_float));
echo "<br><br><br>Result of comparing
strings containing integers and
strings containing floating points.<br>";
echo 'After
array_diff_assoc($arr_string, $arr_string_float):<br>';
var_dump(array_diff_assoc($arr_string, $arr_string_float));
echo '<br><br>After
array_diff_assoc($arr_string_float, $arr_string):<br>';
var_dump(array_diff_assoc($arr_string_float, $arr_string));
echo "<br><br><br>Result of comparing
more than two arrays.<br>";
echo 'After
array_diff_assoc($arr_default_int, $arr_float,
$arr_string, $arr_string_float):<br>';
var_dump(array_diff_assoc($arr_default_int,
$arr_float,
$arr_string,
$arr_string_float));
?>
EXERCISE
<?php
/*
* Test how array_diff_assoc behaves
* 1. When comparing an array that
* has similar elements
* but has been created in a different order
* 2. When doing a strict comparison of
* string representation
*/
echo "Testing array_diff_assoc() : usage variations.<br><br>";
$array = array ('zero',
1 => 1,
'two' => 2.00000000000001);
$inputs = array (
//default keys => string values
/*1*/ array('2.00000000000001', '1', 'zero', 'a'),
//numeric keys => string values
/*2*/ array(2 => '2.00000000000001',
1 => '1',
0 => 'zero',
3 => 'a'),
//string keys => string values
/*3*/ array('2' => '2.00000000000001',
'1' => '1',
'0' => 'zero',
'3' => 'a') ,
//default keys => numeric values
/*4*/ array(2, 1, 0),
//numeric keys => numeric values
/*5*/ array(2 => 2,
1 => 1,
0 => 0),
//string keys => numeric values
/*6*/ array('two' => 2,
'1' => 1,
'0' => 0),
//default keys => float values
/*7*/ array(2.00000000000001, 1.00, 0.01E-9),
//numeric keys => float values
/*8*/ array(2 => 2.00000000000001,
1 => 1.00,
0 => 0.01E-9),
//string keys => float values
/*9*/ array ('two' => 2.00000000000001,
'1' => 1.00,
'0' =>0.01E-9)
);
echo 'The given $array:<br>';
var_dump($array);
echo '<br><br>The given $inputs:<br>';
var_dump($inputs);
// loop through each element of $inputs
// to check the behavior of array_diff_assoc
$iterator = 1;
foreach($inputs as $input) {
echo "<br><br>Iteration: $iterator<br>";
var_dump(array_diff_assoc($array, $input));
var_dump(array_diff_assoc($input, $array));
$iterator++;
};
?>
EXERCISE
<?php
/*
* Tests how array_diff_assoc compares
* 1. Referenced variables
* 2. Arrays that have been referenced to each other
*/
echo "Testing array_diff_assoc() : usage variations.<br><br>";
$a = 'a';
$arr1 = array('a', 'b', 'c', $a);
$arr2 = array('a' => 1, 'b' => 2, 'c' => 3, &$a);
echo 'The given $arr1:<br>';
var_dump($arr1);
echo '<br><br>The given $arr2:<br>';
var_dump($arr2);
echo "<br><br><br><u>Results when \$a = $a</u>:<br>";
echo 'After array_diff_assoc($arr1, $arr2);<br>';
var_dump(array_diff_assoc($arr1, $arr2));
echo '<br><br>After array_diff_assoc($arr2, $arr1);<br>';
var_dump(array_diff_assoc($arr2, $arr1));
$a = 4;
echo "<br><br><br><u>Results when \$a has been changed to $a</u>:<br>";
echo 'After array_diff_assoc($arr1, $arr2);<br>';
var_dump(array_diff_assoc($arr1, $arr2));
echo '<br><br>After array_diff_assoc($arr2, $arr1);<br>';
var_dump(array_diff_assoc($arr2, $arr1));
$arr2 = &$arr1;
echo "<br><br><br><u>Results when \$arr2 is referenced to \$arr1</u>:<br>";
echo 'After array_diff_assoc($arr1, $arr2);<br>';
var_dump(array_diff_assoc($arr1, $arr2));
echo '<br><br>After array_diff_assoc($arr2, $arr1);<br>';
var_dump(array_diff_assoc($arr2, $arr1));
$arr1 = array('zero' => 'x', 'one' => 'y', 'two' => 'z');
echo "<br><br><br><u>Results when \$arr1 is changed to</u>:<br>";
var_dump($arr1);
echo '<br><br>After array_diff_assoc($arr1, $arr2);<br>';
var_dump(array_diff_assoc($arr1, $arr2));
echo '<br><br>After array_diff_assoc($arr2, $arr1);<br>';
var_dump(array_diff_assoc($arr2, $arr1));
?>
EXERCISE
<?php
/*
* Test how array_diff_assoc()
* behaves when comparing:
* 1. the order of the array
* 2. duplicate values
* 3. duplicate key names
*/
echo "Testing array_diff_assoc() : variation.<br><br>";
$array_index = array('a', 'b', 'c', 0 => 'd', 'b');
//duplicate key (0), duplicate value (b)
$array_assoc = array ('2' => 'c',
//same key=>value pair, different order
'1' => 'b',
'0' => 'a',
'b' => '3',
//key and value from array_index swapped
'c' => 2);
//same as above, using integer
echo 'The given $array_index:<br>';
var_dump($array_index);
echo '<br><br>The given $array_assoc:<br>';
var_dump($array_assoc);
echo '<br><br>After
array_diff_assoc($array_index, $array_assoc):<br>';
var_dump(array_diff_assoc($array_index, $array_assoc));
echo '<br><br>After
array_diff_assoc($array_assoc, $array_index):<br>';
var_dump(array_diff_assoc($array_assoc, $array_index));
?>
EXERCISE
<?php
/*
* Test how array_diff_assoc
* behaves when comparing
* multi-dimensional arrays
*/
echo "Testing array_diff_assoc() : usage variations:<br>";
$array1 = array('sub_array1' => array (1, 2, 3),
'sub_array2' => array ('a', 'b', 'c'));
$array2 = array('sub_arraya' => array (1, 3, 5),
'sub_arrayb' => array ('a', 'z', 'y'));
echo 'The given $array1:<br>';
var_dump($array1);
echo '<br><br>The given $array2:<br>';
var_dump($array2);
echo "<br><br><br><u>Compare two 2-D arrays</u>:<br>";
var_dump(array_diff_assoc($array1, $array2));
echo '<br><br>';
var_dump(array_diff_assoc($array2, $array1));
echo "<br><br><br><u>Compare subarrays from two 2-D arrays</u>:<br>";
var_dump(array_diff_assoc($array1['sub_array1'],
$array2['sub_arraya']));
echo '<br><br>';
var_dump(array_diff_assoc($array2['sub_arraya'],
$array1['sub_array1']));
echo '<br><br>';
var_dump(array_diff_assoc($array1['sub_array2'],
$array2['sub_arrayb']));
echo '<br><br>';
var_dump(array_diff_assoc($array2['sub_arrayb'],
$array1['sub_array1']));
echo "<br><br><br><u>Compare a subarray
from one 2-D array and one 2-D array</u>:<br>";
var_dump(array_diff_assoc($array1['sub_array1'], $array2));
echo '<br><br>';
var_dump(array_diff_assoc($array1, $array2['sub_arraya']));
?>