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@ 2019-02-17T17:02:35Z

<?php

function build_external_url(string $host, string $path = null, array $query = [], string $schema = null, int $port = null): string
{                                                                                
    $url = $host;                                                                
    if (null !== $port) {                                                     
        $url .= ':' . $port;                                                  
    }                                                                         
    if (null !== $path) {                                                        
        $url .= '/' . ltrim($path, '/');                                      
    }                                                                         
    if (! empty($query)) {                                                    
        $url .= '?' . http_build_query($query);                               
    }                                                                         
    return (null === $schema ? $url : ($schema . '://' . $url));               
}                                                                             

$tests = [
    [ 'foo.co' ],
    [ 'foo.co', '/bar' ],
    [ 'foo.co', 'bar', [ 'x' => 'baz' ]],
    [ 'foo.co', 'bar', [], 'ftp' ],
    [ 'foo.co', 'bar', ['email' => 'me@foo.co'], 'ftp', '24225'],
];
foreach ($tests as $args) {
    echo build_external_url(...$args) . PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: foo.co foo.co/bar foo.co/bar?x=baz ftp://foo.co/bar ftp://foo.co:24225/bar?email=me%40foo.co

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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