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@ 2017-07-19T16:39:56Z

<?php
$test = '~/test/../test2/test3/../file.php';
// Fake home setting.
putenv( 'HOME=/Users/alain' );

function get_home_directory() {
    // Unix.
    $home = getenv( 'HOME' );
    if ( ! empty( $home ) ) {
    return rtrim( $home, '/' );
    }

    // Windows.
    if ( ! empty( $_SERVER['HOMEDRIVE'] ) && ! empty( $_SERVER['HOMEPATH'] ) ) {
        $home = $_SERVER['HOMEDRIVE'] . $_SERVER['HOMEPATH'];
        return rtrim( $home, '\\/' );
    }

    return '~';
}

function get_normalized_path($path) {
    return array_reduce(explode('/', $path), function( $a = '/', $b ) {
        switch ( $b ) {
            case '':
            case '.':
                return $a;
            case '..':
                return dirname( $a );
            case '~':
                return get_home_directory();
            default:
        		return preg_replace("/\/+/", "/", "$a/$b");
        }
    } );
}

echo $test . PHP_EOL;
echo get_normalized_path( $test ) . PHP_EOL;

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Optional parameter $a declared before required parameter $b is implicitly treated as a required parameter in /in/9Ga8c on line 23 ~/test/../test2/test3/../file.php /Users/alain/test2/file.php

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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