Function name conflict when including a PHP file in a WordPress Theme
Question
I am a PHP novice, so bear with me if any of my terminology is incorrect.
I have a small PHP file ( page_class.php ) that defines some functions and I include this file in the header.php of my theme:
<?php include("page_class.php"); ?>
And these are the contents of page_class.php :
<?php
function curPageURL() {
$pageURL = 'http';
if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
$pageURL .= "://";
if ($_SERVER["SERVER_PORT"] != "80") {
$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} else {
$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
}
return $pageURL;
}
function get_subdomain() {
$page_url = curPageURL();
$parts = split('\.', $_SERVER["SERVER_NAME"]);
return $parts[0];
}
function get_body_class() {
$subdomain = get_subdomain();
if ($subdomain == "keyes") {
$path_parts = split('/', $_SERVER["REQUEST_URI"]);
$clazz = $path_parts[1];
}
else {
$clazz = $subdomain;
}
if ($clazz == "greasemonkey" || $clazz == "wordpress") {
$clazz = "work";
}
if ($clazz == "") {
$clazz = "home";
}
return $clazz;
}
?>
I call get_body_class in header.php :
<body class="<?php echo get_body_class(); ?>">
This setup worked in WordPress MU 2.7.1. I recently upgraded to 2.8.6 and it broke. When I visited any page on the blog the screen was blank.
After some investigation I figured out that by changing the function names (I prefixed them with jk_ ) it worked again.
I guessed this was a naming conflict, but couldn't find any. I wonder do any PHP or WordPress devs have any idea why this happens.
2 answers
solution1
1 ACCPTED 2009-12-20 23:23:49
get_body_class() seems in fact to be there since 2.8 . You're not the only one who had the problem: See here .
By the way, while it is the right thing to have error reporting turned off on a production server, you may want to turn it up some if you get errors like that.
error_reporting(E_ALL ^ E_NOTICE);
solution2
0 2009-12-20 23:24:58
I've just downloaded the sources of wordpress 2.9 (not exactly the same version as yours, I admit, but it's the last one, and the easiest to get from wordpress.org), and it seems there is already an existing get_body_class function :
$ grep -rn 'get_body_class' *
wp-includes/post-template.php:354: echo 'class="' . join( ' ', get_body_class( $class ) ) . '"';
wp-includes/post-template.php:365:function get_body_class( $class = '' ) {
It seems that function is defined in post-template.php (line 365 in wordpress 2.9) ; which explains the conflict, as it's not possible to have two functions with the same name, in PHP.
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