COMPUTES the intersection of ARRAYS, compares data and indexes by a callback function.
<?php
arr array_uintersect ( arr $array1 , arr $array2 [,
arr $arra3, ..., arr $arrayN ],
callable $value_compare_func )
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
$value_compare_func = The callable function to use in the compare
?>
EXERCISE
<?php
$arr_current = [ "Lust", "Pride", "Gluttony",
"Greed", "Sloth", "Wrath", "Envy"];
$arr_gregory = [ "Lust", "Pride", "Envy",
"Anger", "Sadness",
"Avarice", "Gluttony" ];
$arr_thomas = [ "Lust","PRIDE", "Greed",
"Gluttony", "Sloth", "Envy", "Anger" ];
$arr_common = array_uintersect($arr_current,
$arr_gregory,
$arr_thomas,
'strcmp');
echo 'SEVEN DEADLY SINS.<br><br>CURRENT:<br>';
print_r($arr_current);
echo '<br><br>ACCORDING POPE GREGORY:<br>';
print_r($arr_gregory);
echo '<br><br>ACCORDING ST. THOMAS AQUINAS:<br>';
print_r($arr_thomas);
echo '<br><br><br>COMMON AT ALL:<br>';
print_r($arr_common);
?>
EXERCISE
<?php
$Acurr = [ 'first' => "Lust", 'second' => "Gluttony",
'third' => "Greed", 'fourth' => "Sloth", 'fifth' => "Wrath",
'sixth' => "Envy", 'seventh' => "Pride"];
$Agreg = [ 'first' => "Lust", 'second' => "Envy",
'third' => "Anger", 'fourth' => "Sadness",
'fifth' => "Avarice", 'sixth' => "Gluttony",
'seventh' => "Pride" ];
$Athom = [ 'first' => "Lust", 'second' => "Greed",
'third' => "Gluttony", 'fourth' => "Pride",
'fifth' => "Sloth", 'sixth' => "Envy",
'seventh' => "Anger" ];
$Acomm = array_uintersect($Acurr,
$Agreg,
$Athom,
'strcmp');
echo 'SEVEN DEADLY SINS.<br><br>CURRENT:<br>';
print_r($Acurr);
echo '<br><br>ACCORDING POPE GREGORY:<br>';
print_r($Agreg);
echo '<br><br>ACCORDING ST. THOMAS AQUINAS:<br>';
print_r($Athom);
echo '<br><br><br>COMMON AT ALL:<br>';
print_r($Acomm);
?>
EXERCISE
<?php
$Ccurr = [ 'first' => "Lust", 'second' => "Gluttony",
'third' => "Greed", 'fourth' => "Sloth", 'fifth' => "Wrath",
'sixth' => "Envy", 'seventh' => "Pride"];
$Cgreg = [ 'first' => "LUST", 'second' => "ENVY",
'third' => "Anger", 'fourth' => "Sadness",
'fifth' => "Avarice", 'sixth' => "Gluttony",
'seventh' => "Pride" ];
$Cthom = [ 'first' => "Lust", 'second' => "Greed",
'third' => "GLUTTONY", 'fourth' => "Pride",
'fifth' => "Sloth", 'sixth' => "Envy",
'seventh' => "Anger" ];
$Ccomm = array_uintersect($Ccurr,
$Cgreg,
$Cthom,
'strnatcasecmp');
echo 'SEVEN DEADLY SINS.<br><br>CURRENT:<br>';
print_r($Ccurr);
echo '<br><br>ACCORDING POPE GREGORY:<br>';
print_r($Cgreg);
echo '<br><br>ACCORDING ST. THOMAS AQUINAS:<br>';
print_r($Cthom);
echo '<br><br><br>SEVEN DEADLY SINS - COMMONS<br><br>';
print_r($Ccomm);
?>
EXERCISE
<?php
/*
* Function is implemented in ext/standard/array.c
*/
class cr {
private $priv_member;
function __construct($val) {
$this->priv_member = $val;
}
static function comp_func_cr($a, $b) {
if ($a->priv_member === $b->priv_member) return 0;
return ($a->priv_member > $b->priv_member) ? 1 : -1;
}
}
$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1 => new cr(4), 2 => new cr(-15),);
$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1 => new cr(4), 2 => new cr(-15),);
$result = array_uintersect($a, $b, array("cr", "comp_func_cr"));
echo '<pre>';
var_dump($result);
echo '</pre>';
?>
EXERCISE
<?php
echo "Testing array_uintersect() : usage variation.";
// Initialise function arguments
// not being substituted (if any)
$array2 = array(1, 2);
include('compare_function.inc');
$data_compare_function = 'compare_function';
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// define some classes
class classWithToString
{
public function __toString() {
return "Class A object";
}
}
class classWithoutToString
{
}
// heredoc string
$heredoc = <<<EOT
hello world
EOT;
// add arrays
$index_array = array (1, 2, 3);
$assoc_array = array ('one' => 1, 'two' => 2);
//array of values to iterate over
$inputs = array(
// int data
'int 0' => 0,
'int 1' => 1,
'int 12345' => 12345,
'int -12345' => -2345,
// float data
'float 10.5' => 10.5,
'float -10.5' => -10.5,
'float 12.3456789000e10' => 12.3456789000e10,
'float -12.3456789000e10' => -12.3456789000e10,
'float .5' => .5,
// null data
'uppercase NULL' => NULL,
'lowercase null' => null,
// boolean data
'lowercase true' => true,
'lowercase false' =>false,
'uppercase TRUE' =>TRUE,
'uppercase FALSE' =>FALSE,
// empty data
'empty string DQ' => "",
'empty string SQ' => '',
// string data
'string DQ' => "string",
'string SQ' => 'string',
'mixed case string' => "sTrInG",
'heredoc' => $heredoc,
// object data
'instance of classWithToString' => new classWithToString(),
'instance of classWithoutToString' => new classWithoutToString(),
// undefined data
'undefined var' => @$undefined_var,
// unset data
'unset var' => @$unset_var,
);
// loop through each element of the array for array1
foreach($inputs as $key =>$value) {
echo "<br><br>$key:<br>";
try {
var_dump( array_uintersect($value, $array2, $data_compare_function) );
} catch (TypeError $e) {
echo $e->getMessage(), "<br>";
}
};
?>
EXERCISE
<?php
echo "Testing array_uintersect() : usage variation.";
// Initialise function arguments
// not being substituted (if any)
$array1 = array(1, 2);
include('compare_function.inc');
$data_compare_function = 'compare_function';
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// define some classes
class classWithToString
{
public function __toString() {
return "Class A object";
}
}
class classWithoutToString
{
}
// heredoc string
$heredoc = <<<EOT
hello world
EOT;
// add arrays
$index_array = array (1, 2, 3);
$assoc_array = array ('one' => 1, 'two' => 2);
//array of values to iterate over
$inputs = array(
// int data
'int 0' => 0,
'int 1' => 1,
'int 12345' => 12345,
'int -12345' => -2345,
// float data
'float 10.5' => 10.5,
'float -10.5' => -10.5,
'float 12.3456789000e10' => 12.3456789000e10,
'float -12.3456789000e10' => -12.3456789000e10,
'float .5' => .5,
// null data
'uppercase NULL' => NULL,
'lowercase null' => null,
// boolean data
'lowercase true' => true,
'lowercase false' =>false,
'uppercase TRUE' =>TRUE,
'uppercase FALSE' =>FALSE,
// empty data
'empty string DQ' => "",
'empty string SQ' => '',
// string data
'string DQ' => "string",
'string SQ' => 'string',
'mixed case string' => "sTrInG",
'heredoc' => $heredoc,
// object data
'instance of classWithToString' => new classWithToString(),
'instance of classWithoutToString' => new classWithoutToString(),
// undefined data
'undefined var' => @$undefined_var,
// unset data
'unset var' => @$unset_var,
);
// loop through each element of the array for array2
foreach($inputs as $key =>$value) {
echo "<br><br>$key:<br>";
try {
var_dump( array_uintersect($array1, $value, $data_compare_function) );
} catch (TypeError $e) {
echo $e->getMessage(), "<br>";
}
};
?>
EXERCISE
<?php
echo "Testing array_uintersect() : usage variation - differing comparison functions.";
$arr1 = array(1);
$arr2 = array(1,2);
echo "<br><br>Comparison function with an incorrect return value:<br>";
function incorrect_return_value ($val1, $val2) {
return array(1);
}
var_dump(array_uintersect($arr1, $arr2, 'incorrect_return_value'));
echo "<br><br>Comparison function taking too many parameters:<br>";
function too_many_parameters ($val1, $val2, $val3) {
return 1;
}
try {
var_dump(array_uintersect($arr1, $arr2, 'too_many_parameters'));
} catch (Throwable $e) {
echo "Exception: " . $e->getMessage() . "\n";
}
echo "<br><br>Comparison function taking too few parameters:<br>";
function too_few_parameters ($val1) {
return 1;
}
var_dump(array_uintersect($arr1, $arr2, 'too_few_parameters'));
?>