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$pwd = str_shuffle(bin2hex(openssl_random_pseudo_bytes(4)));

OR

// usage: $newpassword = generatePassword(12); // for a 12-char password, upper/lower/numbers.
// functions that use rand() or mt_rand() are not secure according to the PHP manual.
function getRandomBytes($nbBytes = 32)
{
    $bytes = openssl_random_pseudo_bytes($nbBytes, $strong);
    if (false !== $bytes && true === $strong) {
        return $bytes;
    }
    else {
        throw new \Exception("Unable to generate secure token from OpenSSL.");
    }
}
function generatePassword($length){
    return substr(preg_replace("/[^a-zA-Z0-9]/", "", base64_encode(getRandomBytes($length+1))),0,$length);
}

<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a>$pwd = str_shuffle(bin2hex(openssl_random_pseudo_bytes(4))); </span><span id="L-2"><a name="L-2"></a> </span><span id="L-3"><a name="L-3"></a>OR </span><span id="L-4"><a name="L-4"></a> </span><span id="L-5"><a name="L-5"></a>// usage: $newpassword = generatePassword(12); // for a 12-char password, upper/lower/numbers. </span><span id="L-6"><a name="L-6"></a>// functions that use rand() or mt_rand() are not secure according to the PHP manual. </span><span id="L-7"><a name="L-7"></a>function getRandomBytes($nbBytes = 32) </span><span id="L-8"><a name="L-8"></a>{ </span><span id="L-9"><a name="L-9"></a> $bytes = openssl_random_pseudo_bytes($nbBytes, $strong); </span><span id="L-10"><a name="L-10"></a> if (false !== $bytes &amp;&amp; true === $strong) { </span><span id="L-11"><a name="L-11"></a> return $bytes; </span><span id="L-12"><a name="L-12"></a> } </span><span id="L-13"><a name="L-13"></a> else { </span><span id="L-14"><a name="L-14"></a> throw new \Exception(&quot;Unable to generate secure token from OpenSSL.&quot;); </span><span id="L-15"><a name="L-15"></a> } </span><span id="L-16"><a name="L-16"></a>} </span><span id="L-17"><a name="L-17"></a>function generatePassword($length){ </span><span id="L-18"><a name="L-18"></a> return substr(preg_replace(&quot;/[^a-zA-Z0-9]/&quot;, &quot;&quot;, base64_encode(getRandomBytes($length+1))),0,$length); </span><span id="L-19"><a name="L-19"></a>} </span></pre></div> </td></tr></table>