PHP 4.0 Bug #4202: if interprets "0" as "false" even when checking for "numeric value" vs "false"

From: shh@enovia.com Operating system: Red Hat Linux 6.2 PHP version: 4.0 Release Candidate 1 PHP Bug Type: Misbehaving function Bug description: if interprets "0" as "false" even when checking for "numeric value" vs "false" Here is a script that reproduces the problem: $string_1="<test>"; $string_2="test"; print("strrpos returns: \"".strrpos($string_1,"<")."\"<br>"); if(strrpos($string_1,"<")=="0") print "string_1 if is true<br>"; else print "string_1 if is false<br>"; print("strrpos returns: \"".strrpos($string_2,"<")."\"<br>"); if(strrpos($string_2,"<")=="0") print "string_2 if is true<br>"; else print "string_2 if is false<br>"; When run on PHP-4, Apache 1.3.12, Red Hat Linux 6.2 the output is: strrpos returns: "0" string_1 if is true strrpos returns: "" string_2 if is true <---- This should be false! When run on PHP-3, Apache 1.3.11, Red Hat Linux 6.1 the output is: strrpos returns: "0" string_1 if is true strrpos returns: "" string_2 if is false PHP was configured using ./configure --with-pgsql=/usr/local/pgsql --with-apache=../apache_1.3.12 --enable-track-vars