'Strict Standards: Only variables should be passed by reference' error

Question

I am implementing phpmobilizer on a website. I have created a subdomain "m" which contains a file with the following code (this is just one section):

function __construct($url){
    $this->url = $url;
    $this->server = preg_replace('/^m\./', '', $_SERVER['SERVER_NAME']);
    $this->ext = strtolower(end(explode('.', $this->url)));
    $this->patterns = array();
    $this->replacements = array();
    $this->cookieDomain = $this->__getCookieDomain();
}

The error I am getting is on line 15:

$this->ext = strtolower(end(explode('.', $this->url)));

Strict Standards: Only variables should be passed by reference in website.com/m/phpmobilizer.class.php on line 15

This is the code I am using in the head section to redirect mobile users to the "m" subdomain. I have tested the mobile subdomain with Google's mobile friendly test and it is working correctly.

score 0 · Accepted Answer · answered Apr 28 '15 at 02:30

The error is being caused by the use of 'end()'. The array is passed to end() by reference.

Try splitting the code up e.g.

$urlParts = explode('.', $this->url);
$this->ext = strtolower(end($urlParts));

Reference: http://php.net/manual/en/function.end.php

'Strict Standards: Only variables should be passed by reference' error

1 Answers1