When comparing two strings for equality they appear to be, if possible, being converted to integers prior to the comparison even when explicitly cast.

The following script should demonstrate the issue:

<?php

if("0123" == "123") {
    echo "\"0123\" == \"123\"<br />\n";
}

if("0123" != "123") {
    echo "\"0123\" != \"123\"<br />\n";
}

if((string) "0123" == (string) "123") {
    echo "(string) \"0123\" == (string) \"123\"<br />\n";
}

if((string) "0123" != (string) "123") {
    echo "(string) \"0123\" != (string) \"123\"<br />\n";
}

if(!strcasecmp("0123", "123")) {
    echo "strcasecmp(\"0123\", \"123\") returns equal<br />\n";
} else {
    echo "strcasecmp(\"0123\", \"123\") returns not equal<br />\n";
}

?>

This script will echo :
<output>
"0123" == "123"
(string) "0123" == (string) "123"
strcasecmp("0123", "123") returns not equal
</ouput>

Obviously "0123" is not the same as "123".

<configuration>
'./configure' '--with-mysql' '--with-xml' '--with-apxs' '--with-config-file-path=/etc/httpd'
</configuration>