Online PHP editor | rfc for aDNbo

@ 2021-07-21T01:44:30Z

<?php

$expression = "-11+3*1*4/-6-12";
if (!preg_match('~^-?\d*\.?\d+([*/+-]-?\d*\.?\d+)*$~', $expression)) {
    echo "invalid expression";
} else {
    $components = preg_split('~(?<=\d)([*/+-])~', $expression, 0, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
    var_export($components);  // ['-11','+','3','*','1','*','4','/','-6','-','12']
    while (($index = array_search('*',$components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] * $components[$index + 1]);
        var_export($components);
        // ['-11','+','3','*','4','/','-6','-','12']
        // ['-11','+','12','/','-6','-','12']
    }
    while (($index = array_search('/', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] / $components[$index + 1]);
        var_export($components);  // [-'11','+','-2','-','12']
    }
    while (($index = array_search('+', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] + $components[$index + 1]);
        var_export($components);  // ['-13','-','12']
    }
    while (($index = array_search('-', $components)) !== false) {
        array_splice($components, $index - 1, 3, $components[$index - 1] - $components[$index + 1]);
        var_export($components); // [-25]
    }
    echo current($components);  // -25
}

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => '-11', 1 => '+', 2 => '3', 3 => '*', 4 => '1', 5 => '*', 6 => '4', 7 => '/', 8 => '-6', 9 => '-', 10 => '12', )array ( 0 => '-11', 1 => '+', 2 => 3, 3 => '*', 4 => '4', 5 => '/', 6 => '-6', 7 => '-', 8 => '12', )array ( 0 => '-11', 1 => '+', 2 => 12, 3 => '/', 4 => '-6', 5 => '-', 6 => '12', )array ( 0 => '-11', 1 => '+', 2 => -2, 3 => '-', 4 => '12', )array ( 0 => -13, 1 => '-', 2 => '12', )array ( 0 => -25, )-25

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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