extend the xpath request with php simpleXML

[Martin Kaspar]

new to this list - and also fairly new to php

so sorry if my questions are not so clever...

well i am learing -

and this code snippets make me learn alot.

The following code lists all schools and tries to obtain their names as
well.
I have not covered translations yet because my sample data didn't have
those, but you can also look for all kind of names including translations
and just prefer a specific one):

//
// 2.) Work with the XML Result
//

# get all school nodes with xpath
$xpath = '//node[tag[@k = "amenity" and @v = "school"]]';
$schools = $result->xpath($xpath);
printf("%d School(s) found:\n", count($schools));
foreach ($schools as $index => $school)
{
# Get the name of the school (if any), again with xpath
list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
printf("#%02d: ID:%' -10s [%s,%s] %s\n", $index, $school['id'],
$school['lat'], $school['lon'], $name);
}


The key point here are the xpath queries.

In the above mentioend example two are used, the first xpath queriy is to
get the nodes that have certain tags.I think this is the most interesting
one for me:

//node[tag[@k = "amenity" and @v = "school"]]


This line says: Give us all node elements that have a tag element inside
which has the k attribute value "amenity" and the v attribute value
"school". This is the condition we have to filter out those nodes that are
tagged with amenity school.

Further on xpath is used again, now relative to those school nodes to see
if there is a name and if so to fetch it:

tag[@k = "name"]/@v'

This line says: Relative to the current node, give me the v attribute from
a tag element that as the k attribute value "name". As you can see, some
parts are again similar to the line before. I think you can both adopt them
to your needs.

Because not all school nodes have a name, a default string is provided for
display purposes by adding it to the (then empty) result array:

list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
^^^^^^^^^^^^^^^
Provide Default Value


So here my results for that code-example:

Query returned xxxxx node(s) and took 1.10735 seconds.

2179 School(s) found: the last ones are shown below.....

#2151: ID:2688357765 [51.4668941,-0.9731135] New Directrions, North
Reading
#2152: ID:2702504696 [51.5884265,-0.7829013] Burford School
#2153: ID:2702549737 [51.5802201,-0.7653918] Great Marlow School
#2154: ID:2706219304 [51.3779317,-0.0895302] ARK Oval Primary Academy
#2155: ID:2706219314 [51.3871935,-0.0623001] Ashburton Primary School
#2156: ID:2706219320 [51.3210977,-0.1398859] CALAT Smitham Centre
#2157: ID:2706219326 [51.3638861,-0.0922032] Elmhurst School
#2158: ID:2706219339 [51.4007121,-0.0743710] Harris Academy South Norwood
#2159: ID:2706219343 [51.3831662,-0.0405476] Orchard Way Primary School
#2160: ID:2706219347 [51.3531047,-0.0959447] Purley Oaks Primary School
#2161: ID:2706219348 [51.3428384,-0.0069931] Rowdown Primary School
#2162: ID:2706219350 [51.3954917,-0.0732185] South Norwood Primary School
#2163: ID:2706219351 [51.3377151,-0.1230482] St David's Preparatory School
#2164: ID:2706219353 [51.3993760,-0.1144352] Winterbourne School
#2165: ID:2717394621 [51.8706538,0.1480886] Prep
#2166: ID:2717394636 [51.8685838,0.1463720] Pre-Prep
#2167: ID:2722704201 [51.1398429,-0.0457445] Felbridge Primary School
#2168: ID:2723815070 [50.8465429,-0.3030261] Lancing College
#2169: ID:2727170814 [51.5780664,-0.0249051] Adult Education Centre
#2170: ID:2833253896 [50.9928140,-0.7774996] (unnamed)
#2171: ID:2837001831 [51.1783749,-0.7970866] More House School
#2172: ID:2865091022 [50.9090614,-0.5565425] Dorset House School
#2173: ID:2882477853 [51.6261198,-0.7349665] Bowerdean Primary School
#2174: ID:2901434856 [51.6542477,-0.3098923] The Haberdashers' Aske's
Girls School
#2175: ID:2901434857 [51.6565707,-0.3129822] The Haberdashers' Aske's
Boys School



and now i try to figure out how i can enter more xpath queries at the above
mentioned code


and get out even more important data - see here [url=
http://wiki.openstreetmap.org/wiki/Key:contact]Key:contact - OpenStreetMap
Wiki[/url]

contact:phone
contact:fax
contact:website
contact:email

i will digg into all documents and come back later the weekend... and
report all the findings


well - i think that i need to extend the xpath requests within the loop
where xpath is used again,
now relative to those school nodes to see if there is a name and if so to
fetch it:


tag[@k = "name"]/@v'
tag[@k = "contact:website"]/@v'
tag[@k = "contact:email"]/@v'







Well to extend the xpath-requests i tried the following


this method:

list($website) = $school->xpath ('tag[@k = "website"]/@v'):
list($email) = $school->xpath ('tag[@k = "email"]/@v');



that method:

list($name) = $school->xpath ('tag[@k = "name"]/@v','tag[@k =
"website"]/@v','tag[@k = "email"]/@v') + ['(unnamed)'];




# get all school nodes with xpath

$xpath = '//node[tag[@k = "amenity" and @v = "school"]]';

$schools = $result->xpath ($xpath);

printf("%d School(s) found:\n", count($schools));
foreach ($schools as $index => $school)
{
# Get the name of the school (if any), again with xpath
list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
printf("#%02d: ID:%' -10s [%s,%s] %s\n", $index, $school['id'],
$school['lat'], $school['lon'], $name);
}

?>




list($name) = $school->xpath ('tag[@k = "name"]/@v','tag[@k =
"website"]/@v','tag[@k = "email"]/@v') + ['(unnamed)'];

2 School(s) found:
PHP Warning: SimpleXMLElement::xpath() expects exactly 1 parameter, 3
given in /home/martin/php/osm6.php on line 57
PHP Fatal error: Unsupported operand types in /home/martin/php/osm6.php on
line 57
***@linux-70ce:~/php>



question is - how to extend the xpath requests within the above mentioned
loop


love to hear from you

greetings

martin

Well, it seems pretty obvious to me. Try rereading the error;
"PHP Warning: parse_ini_file(/opt/php-5.3.22/bin/includes/../drush.info
failed to open stream: No such file or directory". This means that when

PHP

tried to read "/opt/php-5.3.22/bin/includes/../drush.info" it could not
find the file.
So what you should do is... check where that file went :)
Obviously, "/opt/php-5.3.22/bin/includes/../drush.info" means it's in
"/opt/php-5.3.22/bin/drush.info" (since ../ means 'go up 1 directory').

Yup! Makes sense now. Thanks, Tul!
Tim
On Wed, Jun 11, 2014 at 5:40 PM, Maciek Sokolewicz <

PHP Warning: parse_ini_file(/opt/php-5.3.22/bin/includes/../drush.info
failed to open stream: No such file or directory

Well, it seems pretty obvious to me. Try rereading the error;
"PHP Warning: parse_ini_file(/opt/php-5.3.22/bin/includes/../drush.info
failed to open stream: No such file or directory". This means that when

PHP

tried to read "/opt/php-5.3.22/bin/includes/../drush.info" it could not
find the file.
So what you should do is... check where that file went :)
Obviously, "/opt/php-5.3.22/bin/includes/../drush.info" means it's in
"/opt/php-5.3.22/bin/drush.info" (since ../ means 'go up 1 directory').
Good luck,
- Tul

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