Online PHP editor | rfc for Qa43R

@ 2021-07-15T11:48:06Z

<?php

$string = "To be escaped: + - = && || > < ! ( ) { } [ ] ^ \" ~ * ? : \ / triple ||| and split '&<&'"; 

print_r(
    [
        $string,
        LouisBarranqueiro($string),
        MikkoRantalainen($string),
        mickmackusa($string)
    ]
);

function LouisBarranqueiro($string) {
    $regex = "/[\\+\\-\\=\\&\\|\\!\\(\\)\\{\\}\\[\\]\\^\\\"\\~\\*\\<\\>\\?\\:\\\\\\/]/";
    $string = preg_replace_callback ($regex, 
        function ($matches) { 
            return "\\" . $matches[0]; 
        }, $string); 
    return $string;
}

function MikkoRantalainen($s)
{
    static $replacements = array();
    if (!$replacements)
    {
        # https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#_reserved_characters
        $replacements = array(
            "\\" => "\\\\", # must be done first to not double encode later backslashes!
            "+" => "\\+",
            "-" => "\\-",
            "=" => "\\=",
            "&" => "\\&",
            "|" => "\\|",
            ">" => "", # cannot be safely encoded
            "<" => "", # cannot be safely encoded
            "!" => "\\!",
            "(" => "\\(",
            ")" => "\\)",
            "{" => "\\{",
            "}" => "\\}",
            "[" => "\\[",
            "]" => "\\]",
            "^" => "\\^",
            "\"" => "\\\"",
            "~" => "\\~",
            "*" => "\\*",
            "?" => "\\?",
            ":" => "\\:",
            "/" => "\\/",
        );
    }
    return str_replace(array_keys($replacements), array_values($replacements), $s);
}

function mickmackusa($string) {
    return preg_replace(
        [
            '_[<>]+_',                                     // prevent hack where double-symbol is split by gt/lt symbol
            '_[-+=!(){}[\]^"~*?:\\/\\\\]|&(?=&)|\|(?=\|)_',
        ],
        [
            '',
            '\\\\$0',
        ],
        $string
    );
}

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => To be escaped: + - = && || > < ! ( ) { } [ ] ^ " ~ * ? : \ / triple ||| and split '&<&' [1] => To be escaped\: \+ \- \= \&\& \|\| \> \< \! \( \) \{ \} \[ \] \^ \" \~ \* \? \: \\ \/ triple \|\|\| and split '\&\<\&' [2] => To be escaped\: \+ \- \= \&\& \|\| \! \( \) \{ \} \[ \] \^ \" \~ \* \? \: \\ \/ triple \|\|\| and split '\&\&' [3] => To be escaped\: \+ \- \= \&& \|| \! \( \) \{ \} \[ \] \^ \" \~ \* \? \: \\ \/ triple \|\|| and split '\&&' )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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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