<s>
PRADO	B-Language
is	O
an	O
open	B-Application
source	I-Application
,	O
object-oriented	B-Language
,	O
event-driven	B-Application
,	O
component-based	B-Architecture
PHP	B-Application
web	B-Application
framework	I-Application
.	O
</s>
<s>
PRADO	B-Language
is	O
used	O
for	O
the	O
development	O
of	O
interactive	O
web	O
pages	O
and	O
applications	B-Application
.	O
</s>
<s>
In	O
2013	O
,	O
it	O
was	O
considered	O
by	O
Computer	O
Science	O
educators	O
to	O
be	O
one	O
of	O
the	O
top	O
six	O
PHP	B-Application
web	B-Application
frameworks	I-Application
.	O
</s>
<s>
PRADO	B-Language
's	O
name	O
is	O
an	O
acronym	O
derived	O
from	O
"	O
PHP	B-Application
Rapid	O
Application	O
Development	O
Object-oriented	B-Language
"	O
.	O
</s>
<s>
The	O
PRADO	B-Language
project	O
was	O
started	O
by	O
Qiang	O
Xue	O
and	O
was	O
inspired	O
by	O
Apache	B-Language
Tapestry	I-Language
.	O
</s>
<s>
The	O
framework	O
also	O
borrowed	O
ideas	O
from	O
Borland	B-Language
Delphi	I-Language
and	O
Microsoft	O
's	O
ASP.NET	B-Application
framework	I-Application
.	O
</s>
<s>
The	O
first	O
public	O
release	O
of	O
PRADO	B-Language
came	O
out	O
in	O
June	O
2004	O
,	O
but	O
was	O
written	O
using	O
the	O
very	O
limited	O
and	O
now	O
outdated	O
PHP4	O
object	B-Application
model	I-Application
,	O
which	O
caused	O
many	O
problems	O
.	O
</s>
<s>
Qiang	O
re-wrote	O
the	O
framework	O
for	O
the	O
new	O
PHP5	O
object	B-Application
model	I-Application
,	O
and	O
won	O
the	O
Zend	O
PHP5	O
coding	O
contest	O
with	O
it	O
.	O
</s>
<s>
PRADO	B-Language
is	O
a	O
rapid	O
application	O
development	O
(	O
RAD	O
)	O
framework	O
,	O
and	O
in	O
its	O
infancy	O
was	O
criticized	O
as	O
not	O
yet	O
ready	O
for	O
high-performance	O
,	O
high-traffic	O
scenarios	O
.	O
</s>
<s>
Implementations	O
of	O
template	B-Application
and	O
configuration	O
caching	B-General_Concept
in	O
later	O
PRADO	B-Language
releases	O
eliminated	O
some	O
performance	O
bottlenecks	O
in	O
its	O
architecture	O
,	O
increasing	O
its	O
suitability	O
for	O
medium	O
-	O
to	O
high-traffic	O
websites	O
.	O
</s>
<s>
In	O
2008	O
,	O
PRADO	B-Language
was	O
succeeded	O
by	O
the	O
Yii	B-Language
framework	I-Language
,	O
a	O
conceptual	O
redesign	O
of	O
PRADO	B-Language
targeted	O
to	O
high-traffic	O
scenarios	O
.	O
</s>
