PHP Symbol Tables

• Hash Tables
• 'active_symbol_table' - current
• 'symbol_table' - main (global)
• _php3_hash_exist() to check if a var exists
• _php3_hash_find() to check the type of a var
• Arrays in PHP use the same hash functions

Setting variables in the symbol table

• SET_VAR_STRING(name,value)
• SET_VAR_DOUBLE(name,value)
• SET_VAR_LONG(name,value)

value arg must be emalloc'ed - no static memory!