new file:   001_Comment/comment.php
	new file:   002_Verbeter/verbeter.php
	new file:   003_Concatenate/concatenate.php
	new file:   004_Extra-Functions/string-extra-functions.php
	new file:   005_Conditional/opdracht_conditional.php
	new file:   006_if-else/opdracht-if-else.php
	new file:   007_if-elseif/opdracht-if-elseif.php
	new file:   008_Switch/opdracht-switch.php
	new file:   009_Arrays-Basis/opdracht-arrays-basis.php
	new file:   010_Array-Functies/opdracht-array-functies.php
	new file:   012_Foreach/opdracht-foreach-deel1.php
	new file:   012_Foreach/opdracht-foreach-deel2.php
	new file:   013_Functies/opdracht-functies.php