==26889== 256 bytes in 2 blocks are definitely lost in loss record 6 of 9
==26889== at 0x4C2ABA0: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==26889== by 0x7E83F9: _emalloc (zend_alloc.c:2427)
==26889== by 0x6F0FF79: php_phongo_malloc (php_phongo.c:1177)
==26889== by 0x6EDBAC3: bson_malloc (bson-memory.c:67)
==26889== by 0x6ECF4EC: bson_new (bson.c:1877)
==26889== by 0x6EB4570: zval_to_bson (bson.c:804)
==26889== by 0x6EBD269: zim_WriteBatch_insert (WriteBatch.c:104)
==26889== by 0x86AA5A: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:558)
==26889== by 0x86B231: ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (zend_vm_execute.h:693)
==26889== by 0x86A0C9: execute_ex (zend_vm_execute.h:363)
==26889== by 0x86A152: zend_execute (zend_vm_execute.h:388)
==26889== by 0x8236A8: zend_execute_scripts (zend.c:1344)