loops with array_walk or foreach using array??? of variable pairs

I need to run the if-construct below (containing a number of variables in each "branch") using the 2 variables $table1 and $table2 in each run for each combination Is it array_walk or foreach ? (I "guess" that here I need a 2-dim-array, or so, passing always these 2 variables with each run: This expression has to be run using the 2 variables $table1 and $table2 in each possible combination, which is : $table1="a"; $table2="x"; $table1="a"; $table2="y"; $table1="a"; $table2="z"; $table1="b"; $table2="x"; $table1="b"; $table2="y"; $table1="b"; $table2="z"; How do I assign these valies to a multidim array and pass pairs of $table1 and $table2 to a foreach() or array_walk loop? Now this is the construct that shall be looped thru: For($i=0,$i<$numfields,$i++) { If($table1=="a" || $table1=="b" ) { if($table1=="a") {Do this using 4 variables} elseif($table1=="b") {Do that using 6 varuables} } elseif($table1=="c") { if($table2=="x") {Do this} using 4 variables elseif($table2=="y") {Do that using 4 variables} elseif($table3=="z") {Do something else using 6 variables} } } //endfor Thanks for any idea on this.