 # putting vectors into matrix

I have a variable number of vextors of variable length. I needt to put them into a rectangular matrix with as many columns as there are vectors and rows which contain all combinations of vector cell entries. For example, given the three vectors:
[a,b]
[c,d,e]
[f,g]
i need a matrix with 3 columns and 12 rows:
a c f
a c g
a d f
a d g
a e f
a e g
b c f
etc to…
b e g
Thanks for any help
Tony

``````\$m1 = array("a", "b");
\$m2 = array("c", "d", "e");
\$m3 = array("f", "g");

\$output = array();
\$x = 0;

for (\$i = 0; \$i < count(\$m1); \$i++) {
\$first = \$m1[\$i];
for (\$j = 0; \$j < count(\$m2); \$j++) {
\$second = \$m2[\$i];
for (\$k = 0; \$k < count(\$m3); \$k++) {
\$third = \$m3[\$i];
\$output[\$x++] = array(\$first, \$second, \$third);
}
}
}``````

Thanks Zyppora, but the number of vectors is variable, so you can’t use \$first, \$second etc. However, I’ve solved it, painstakingly, by looking at the number of times each cell is repeated in a column, and the number of cycles of cell entries.
Tony