Try using apt to install zendapi.
apt-get install php4-ming gives the following error:-
The following packages have unmet dependencies:-
php4-ming: Depends: zendapi-20010901
How to solve it?
Try using apt to install zendapi.
That's what I did but but package zendapi could not be found.
apt-cache search zendapi
php4 - server-side, HTML-embedded scripting language (meta-package)
php4-cgi - server-side, HTML-embedded scripting language (CGI binary)

KNOPPIX 9.1 Linux Install & Live DVD 32bit & 64bit
$19.99
Knoppix Live GNU Linux System 9.1 on Bootable CD / DVD / USB Flash Drive
$5.99
KNOPPIX USB DVD OS , BEST OF ALL HIGHLY RECOMENDED
$11.99
Knoppix Linux Bootable OS v8.6 "Original Live Operating System" 16G USB Stick
$20.85
Knoppix Linux Bootable OS v8.6 "Original Live Operating System" 32G USB Stick
$21.42
VINTAGE SOFTWARE | KNOPPIX STD 0.1 (SECURITY TOOLS DISTRIBUTION)
$7.57
$8.00
Vintage Linux DVD - Knoppix 5.2 - c't Magazine - 7 / 2007 - Software Collection 2
$7.84
$7.00
Knoppix 5.0.1 ULTRA RARE Linux DVD - Linux Pro Extra August 2006
$33.59