<?phpecho "openssl version text: " . OPENSSL_VERSION_TEXT . "\n";echo "openssl version number:  " . OPENSSL_VERSION_NUMBER . "\n";?>will output something like:    openssl version text: OpenSSL 1.0.2d 9 Jul 2015    openssl version number:  268443727see also: https://wiki.openssl.org/index.php/Manual:OPENSSL_VERSION_NUMBER(3)

Plase note that these constants show notthe current system openssl library versionbut version PHP was compiled with.

Fixed version (patch hexdec conversion + version_compare usage)<?php// OPENSSL_VERSION_NUMBER parser, works from OpenSSL v.0.9.5b+ (e.g. for use with version_compare())// OPENSSL_VERSION_NUMBER is a numeric release version 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 version_compare* @param OpenSSL version identifier as hex value $openssl_version_number*/function get_openssl_version_number($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>[[:xdigit:]])(?<minor>[[:xdigit:]][[:xdigit:]])(?<fix>[[:xdigit:]][[:xdigit:]])';    $preg.= '(?<patch>[[:xdigit:]][[:xdigit:]])(?<type>[[:xdigit:]])/';    preg_match_all($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=>'k',                                       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 (!$patch_as_number && array_key_exists($patchlevel_dec, $alphabet)) {            $openssl_version.= $alphabet[$patchlevel_dec]; // ideal for text comparison        }        else {            $openssl_version.= '.'.$patchlevel_dec; // ideal for version_compare        }    }    return $openssl_version;}?>

// OPENSSL_VERSION_NUMBER parser, works from OpenSSL v.0.9.5b+ (e.g. for use with version_compare())// OPENSSL_VERSION_NUMBER is a numeric release version 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 version identifier as hex value $openssl_version_number */ function get_openssl_version_number($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>[[:xdigit:]])(?<minor>[[:xdigit:]][[:xdigit:]])(?<fix>[[:xdigit:]][[:xdigit:]])';    $preg.= '(?<patch>[[:xdigit:]][[:xdigit:]])(?<type>[[:xdigit:]])/';    preg_match_all($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=>'k',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 (!$patch_as_number && array_key_exists(intval($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 version_compare        }    }        return $openssl_version;}