gramo at skina dot com dot co
26-Mar-2003 01:48
[ Editor's Note: Unchecked boxes are not passed to the form action page at
all. Therefore if only two of the four checkboxes below are checked, only
two will be passed to the action page and sizeof/count will return two.
grammo's statement that the array contains NULL elements is incorrect.
]
When you have a php page receiving data from a form with an
array
like:
--------8<----------------8<----------------8<--------
<FORM
ACTION="receiver.php" METHOD=POST>
<INPUT
TYPE=CHECKBOX NAME="arreglo[0]">Thing #1
<INPUT
TYPE=CHECKBOX NAME="arreglo[1]">Thing #2
<INPUT
TYPE=CHECKBOX NAME="arreglo[2]">Thing #1
<INPUT
TYPE=CHECKBOX NAME="arreglo[3]">Thing #4
<INPUT
TYPE=SUBMIT>
</FORM>
--------8<----------------8<----------------8<--------
And
you just pick Thing #2 and Thing #4
like:
--------8<----------------8<----------------8<--------
[
] Thing #1
[X] Thing #2
[ ] Thing #1
[X] Thing
#4
[OK]
--------8<----------------8<----------------8<--------
When
you count the number of elements in arreglo {NULL, "on", NULL,
"on"} you receive just a 2 for answer, because NULL counts as no
element for the count function.
These have huge importance when
you generate the forwarding form with a database query and you need to know
how many elements does the script generate.
The only way to fix
these problem is by adding a new element at the form in this
way:
--------8<----------------8<----------------8<--------<FORM
ACTION="receiver.php" METHOD=POST>
<INPUT
TYPE=HIDDEN NAME="arreglo_size" VALUE="4">
<INPUT TYPE=CHECKBOX NAME="arreglo[0]">Thing #1
<INPUT TYPE=CHECKBOX NAME="arreglo[1]">Thing #2
<INPUT TYPE=CHECKBOX NAME="arreglo[2]">Thing #1
<INPUT TYPE=CHECKBOX NAME="arreglo[3]">Thing #4
<INPUT
TYPE=SUBMIT>
</FORM>
--------8<----------------8<----------------8<--------
shuffle
