Online PHP editor | rfc for c5PIX

@ 2021-07-21T01:51:50Z

<?php

$expression = "5+4^3^2^1";
if (!preg_match('~^-?\d*\.?\d+([*/+-^]-?\d*\.?\d+)*$~', $expression)) {
    echo "invalid expression";
} else {
    $components = preg_split('~(?<=\d)([*/+-^])~', $expression, 0, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
    var_export($components);  // ['5','+','4','^','3','^','2','^','1']
    while (($index = array_search('^', $components)) !== false) {
        array_splice($components, $index - 1, 3, pow($components[$index - 1], $components[$index + 1]));
        var_export($components);
        // ['5', '+', 64, '^', '2', '^', '1']
        // ['5', '+' ,4096, '^', '1']
        // ['5', '+', 4096]
    }
    while (($index = array_search('*', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] * $components[$index + 1]);
        var_export($components);
    }
    while (($index = array_search('/', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] / $components[$index + 1]);
    }
    while (($index = array_search('+', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] + $components[$index + 1]);
        // [4101]
    }
    while (($index = array_search('-', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] - $components[$index + 1]);
    }
    echo $components[0];  // 4101
}

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => '5', 1 => '+', 2 => '4', 3 => '^', 4 => '3', 5 => '^', 6 => '2', 7 => '^', 8 => '1', )array ( 0 => '5', 1 => '+', 2 => 64, 3 => '^', 4 => '2', 5 => '^', 6 => '1', )array ( 0 => '5', 1 => '+', 2 => 4096, 3 => '^', 4 => '1', )array ( 0 => '5', 1 => '+', 2 => 4096, )4101

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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

preferences:dark modelive preview