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run code in 200+ php & hhvm versions

@

<?php

$url = 'http://cmps.cz/i/nar/YT-1954.jpg';

function GetRemoteLastModified( $uri )
{
    // default
    $unixtime = 0;

    $fp = fopen( $uri, "r" );
    if( !$fp ) {return;}

    $MetaData = stream_get_meta_data( $fp );

    foreach( $MetaData['wrapper_data'] as $response )
    {
        // case: redirection
        if( substr( strtolower($response), 0, 10 ) == 'location: ' )
        {
            $newUri = substr( $response, 10 );
            fclose( $fp );
            return GetRemoteLastModified( $newUri );
        }
        // case: last-modified
        elseif( substr( strtolower($response), 0, 15 ) == 'last-modified: ' )
        {
            $unixtime = strtotime( substr($response, 15) );
            break;
        }
    }
    fclose( $fp );
    return $unixtime;
}

var_dump(GetRemoteLastModified('http://cmps.cz/i/nar/YT-1954.jpg'));

eol versions

Output for 5.3.21 - 5.4.45, 5.5.33, 5.6.18 - 5.6.19, 7.0.4, 7.0.20, 7.1.5 - 7.2.0: Warning: fopen(): php_network_getaddresses: getaddrinfo failed: System error in /in/qbGgE on line 10 Warning: fopen(http://cmps.cz/i/nar/YT-1954.jpg): failed to open stream: php_network_getaddresses: getaddrinfo failed: System error in /in/qbGgE on line 10 NULL
Output for 5.5.24 - 5.5.32, 5.5.34 - 5.6.17, 5.6.20 - 7.0.3, 7.0.5 - 7.0.6, 7.1.0: Warning: fopen(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /in/qbGgE on line 10 Warning: fopen(http://cmps.cz/i/nar/YT-1954.jpg): failed to open stream: php_network_getaddresses: getaddrinfo failed: Name or service not known in /in/qbGgE on line 10 NULL