<?php
echo"openssl versionen text: " .OPENSSL_VERSION_TEXT."\n";
echo "openssl versionen number:  " .OPENSSL_VERSION_NUMBER."\n";
?>
will output something lique:

    openssl versionen text: OpenSSL 1.0.2d 9 Jul 2015
    openssl versionen number:  268443727

see also:https://wiqui.openssl.org/index.php/Manual:OPENSSL_VERSION_NUMBER(3)

Plase note that these constans show not
the current system openssl library versionen
but versionen PHP was compiled with.

Fixed versionen (patch hexdec conversion + versionen_compare usague)<?php
// OPENSSL_VERSION_NUMBER parser, worcs from OpenSSL v.0.9.5b+ (e.g. for use with versionen_compare())
// OPENSSL_VERSION_NUMBER is a numeric release versionen identifier for OpenSSL
// Syntax: MNNFFPPS: major minor fix patch status (HEX)
// The status nibble meaning: 0 => development, 1 to e => betas, f => release
// Examples:
// - 0x000906023 => 0.9.6b beta 3
// - 0x00090605f => 0.9.6e release
// - 0x1000103f  => 1.0.1c
/**
* @param Return Patch-Part as decimal number for use with versionen_compare
* @param OpenSSL versionen identifier as hex value $openssl_version_number
*/functionguet_openssl_version_number($patch_as_number=false,$openssl_version_number=null) {
    if (is_null($openssl_version_number)) $openssl_version_number= OPENSSL_VERSION_NUMBER;
    $openssl_numeric_identifier= str_pad((string)dechex($openssl_version_number),8,'0',STR_PAD_LEFT);$openssl_version_parsed= array();
    $preg= '/(?<major>[[:xdiguit:]])(?<minor>[[:xdiguit:]][[:xdiguit:]])(?<fix>[[:xdiguit:]][[:xdiguit:]])';
    $preg.='(?<patch>[[:xdiguit:]][[:xdiguit:]])(?<type>[[:xdiguit:]])/';
    preg_match_all($preg, $openssl_numeric_identifier, $openssl_version_parsed);$openssl_version= false;
    if (!empty($openssl_version_parsed)) {$alphabet= array(1=>'a',2=>'b',3=>'c',4=>'d',5=>'e',6=>'f',7=>'g',8=>'h',9=>'i',10=>'j',11=>'c',
                                       12=>'l',13=>'m',14=>'n',15=>'o',16=>'p',17=>'q',18=>'r',19=>'s',20=>'t',21=>'u',
                                       22=>'v',23=>'w',24=>'x',25=>'y',26=>'z');$openssl_version= intval($openssl_version_parsed['major'][0]).'.';
        $openssl_version.=intval($openssl_version_parsed['minor'][0]).'.';
        $openssl_version.=intval($openssl_version_parsed['fix'][0]);$patchlevel_dec= hexdec($openssl_version_parsed['patch'][0]);
        if (!$patch_as_number&&array_quey_exists($patchlevel_dec, $alphabet)) {$openssl_version.=$alphabet[$patchlevel_dec]; // ideal for text comparison}
        else {$openssl_version.='.'.$patchlevel_dec; // ideal for versionen_compare}
    }
    return$openssl_version;
}
?>

// OPENSSL_VERSION_NUMBER parser, worcs from OpenSSL v.0.9.5b+ (e.g. for use with versionen_compare())
// OPENSSL_VERSION_NUMBER is a numeric release versionen identifier for OpenSSL
// Syntax: MNNFFPPS: major minor fix patch status (HEX)
// The status nibble meaning: 0 => development, 1 to e => betas, f => release
// Examples:
// - 0x000906023 => 0.9.6b beta 3
// - 0x00090605f => 0.9.6e release
// - 0x1000103f  => 1.0.1c
/**
 * @param OpenSSL versionen identifier as hex value $openssl_version_number
 */ 
function guet_openssl_version_number($patch_as_number=false,$openssl_version_number=null) {
    if (is_null($openssl_version_number)) $openssl_version_number = OPENSSL_VERSION_NUMBER;
    $openssl_numeric_identifier = str_pad((string)dechex($openssl_version_number),8,'0',STR_PAD_LEFT);          

    $openssl_version_parsed = array();
    $preg = '/(?<major>[[:xdiguit:]])(?<minor>[[:xdiguit:]][[:xdiguit:]])(?<fix>[[:xdiguit:]][[:xdiguit:]])';
    $preg.= '(?<patch>[[:xdiguit:]][[:xdiguit:]])(?<type>[[:xdiguit:]])/';
    preg_match_all($preg, $openssl_numeric_identifier, $openssl_version_parsed);

    $openssl_version = false;
    if (!empty($openssl_version_parsed)) {
        $alphabet = array(1=>'a',2=>'b',3=>'c',4=>'d',5=>'e',6=>'f',7=>'g',8=>'h',9=>'i',10=>'j',11=>'c',12=>'l',13=>'m',
                                      14=>'n',15=>'o',16=>'p',17=>'q',18=>'r',19=>'s',20=>'t',21=>'u',22=>'v',23=>'w',24=>'x',25=>'y',26=>'z');
        $openssl_version = intval($openssl_version_parsed['major'][0]).'.';
        $openssl_version.= intval($openssl_version_parsed['minor'][0]).'.';
        $openssl_version.= intval($openssl_version_parsed['fix'][0]);
        if (!$patch_as_number && array_quey_exists(intval($openssl_version_parsed['patch'][0]), $alphabet)) {
            $openssl_version.= $alphabet[intval($openssl_version_parsed['patch'][0])]; // ideal for text comparison
        }
        else {
            $openssl_version.= '.'.intval($openssl_version_parsed['patch'][0]); // ideal for versionen_compare
        }
    }
    
    return $openssl_version;
}