Online PHP editor | output 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 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.27, 8.4.1 - 8.4.14, 8.5.0: 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 '\&&' )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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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