Description:
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The solr module states that it will work with PHP version 5.2.3 and higher, but the JSON module changed APIs in version 5.3.0 requiring a different number of parameters to php_json_decode().  The solr code uses the number of parameters from the newer API and so doesn't compile with the older API.  Either a #ifdef needs to be inserted to check for the PHP version and give the right number of parameters or the requirements need to be updated to 5.3.0 .

I'm not a PHP coder, so I don't know if PHP makes it easy to look at versioning at compile time with #defines, but I would expect that it does.  If so, the fix is pretty simple since the added parameter is the recursion depth and can be ignored in the older API.

Expected result:
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successful compile

Actual result:
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libtool: compile:  cc -I. -I/tmp/pear/install/solr -DPHP_ATOM_INC -I/tmp/pear/install/pear-build-rootD2pv37/solr-1.0.1/include -I/tmp/pear/install/pear-build-rootD2pv37/solr-1.0.1/main -I/tmp/pear/install/solr -I/usr/include/php5 -I/usr/include/php5/main -I/usr/include/php5/TSRM -I/usr/include/php5/Zend -I/usr/include/php5/ext -I/usr/include/php5/ext/date/lib -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/libxml2 -DHAVE_CONFIG_H -g -O2 -c /tmp/pear/install/solr/solr_functions_helpers.c  -fPIC -DPIC -o .libs/solr_functions_helpers.o
/tmp/pear/install/solr/solr_functions_helpers.c:23: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'json_globals'
/tmp/pear/install/solr/solr_functions_helpers.c: In function 'solr_json_to_php_native':
/tmp/pear/install/solr/solr_functions_helpers.c:1123: error: too many arguments to function 'php_json_decode'