PHP Read Click Monday to get all Monday data novice this month

PHP wants to click on Monday to get all Monday data for this month novice impatient
I have index.php on the page

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

Want to click Monday to get all Monday data for this month
Want to click Tuesday to get all Tuesday data for this month

Display on the resuindex.php page
No idea.
A label I don't know how to pass it on resuindex.php page
------to solve the idea----------------------

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

resuindex.php

$w = Isset ($_get[' W ')? $_get[' W ']: ';
if (!in_array ($w, Array (1,2,3,4,5,6,7))) {
    Echo ' W error ';
    Exit ();
}

Executes the query DB statement and then outputs

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