Online PHP editor | rfc for T3I63

@ 2013-02-26T12:16:09Z

<?php

/*
 * convert square definition from x,y,l (x,y, length) to x1,y1,x2,y2
 */
function point($sq)
{
    return array(
        'x1' => $sq['x'],
        'y1' => $sq['y'],
        'x2' => $sq['x'] + $sq['l'],
        'y2' => $sq['y'] + $sq['l'],
    );
}

/*
 * return intersect square
 */
function intersect(array $ps)
{
    $r = max(array_map(function($e) { return $e['x1']; }, $ps));
    $l = min(array_map(function($e) { return $e['x2']; }, $ps));

    $t = max(array_map(function($e) { return $e['y1']; }, $ps));
    $b = min(array_map(function($e) { return $e['y2']; }, $ps));


    if ($r < $l && $b > $t) {
        return array(
            'x1' => $l,
            'y1' => $b,
            'x2' => $r,
            'y2' => $t,
        );
    }
    return false;
}

/*
 * return square area
 */
function area($sq) {
    return abs(($sq['x1'] -  $sq['x2']) * ($sq['y1'] -  $sq['y2']));
}

// input data
$sq1 = array('x' => 2, 'y' => 2, 'l' => 4);
$sq2 = array('x' => 3, 'y' => 2, 'l' => 4);

echo 'Intersect: ' . ((false !== $intersect = intersect(array(point($sq1), point($sq2)))) ? 'yes' : 'no') . PHP_EOL;
if (false !== $intersect) {
    echo 'Area: ' . area($intersect) . PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: Intersect: yes Area: 12

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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