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Get POST status of all items

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Oct 11.2020

I’m displaying all items from a database on my form with a checkbox assigned to it. Allowing users to select as many items from my collection as possbie.

On my form submit, how can I collect all those selected checkboxes?

Normally it would be $_POST[‘item1’]; but I can’t hardcode each item that’s being posted as they’re coming from my database.

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PHP

6 Comments(s) ↴

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@NogDogOct 12.2020 — One possibility is to use "array naming" in the HTML form names, perhaps using the ID from the DB for each?
<i>
</i>foreach($db_rows as $row) { // assume it includes $row['id'] and $row['name']
echo "&lt;p&gt;&lt;input type='checkbox' name='foo[{$row['id']}]' value='{$row['name']}'&gt; {$row['name']}&lt;/p&gt;n";
}

Then you could process whichever get submitted (since only checked checkboxes actually submit):
<i>
</i>foreach($_POST['foo'] as $id =&gt; $name) {
// do stuff with $id or whatever?
}
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@HarshShahOct 12.2020 — Hii Kiwis,

Try this one,
``<i>
</i>&lt;form method="post" action=""&gt;
&lt;span&gt;Select Technologies&lt;/span&gt;&lt;br/&gt;
&lt;input type="checkbox" name='lang[]' value="WPF"&gt; WPF &lt;br/&gt;
&lt;input type="checkbox" name='lang[]' value="Angular"&gt; Angular&lt;br/&gt;
&lt;input type="checkbox" name='lang[]' value="Xamarin"&gt; Xamarin &lt;br/&gt;
&lt;input type="checkbox" name='lang[]' value="MVC"&gt; MVC &lt;br/&gt;

&lt;input type="submit" value="Submit" name="submit"&gt;
&lt;/form&gt;

&lt;?php
if(isset($_POST['submit'])){

if(!empty($_POST['lang'])) {

foreach($_POST['lang'] as $value){
echo "value : ".$value.'&lt;br/&gt;';
}

}

}
?&gt;<i>
</i>``
I hope it helps you!!!
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@kiwisauthorOct 12.2020 — @NogDog#1624135

<input type="checkbox" name="foo{<?php echo $item->getId(); ?>}" value='{<?php echo $item->getTitle(); ?>}'>

Show's all my checkboxes okay, name['foo{22}'] etc

Using your foreach thought..

Warning: Invalid argument supplied for foreach() in
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@NogDogOct 12.2020 — > @kiwis80#1624150 Warning: Invalid argument supplied for foreach() in

Did you use method="post" in the &lt;form&gt; tag? If that's not it, maybe do a print_r($_POST) to see where I screwed up? You could also take HarshShah's approach and just put the ID in as the value attribute, using empty brackets to get an enumerated array of submitted checkboxes.

> @kiwis80#1624150 Show's all my checkboxes okay, name['foo{22}'] etc

If that's what is actually output to the HTML, then something is wrong. It should look like name='foo[22]. I used the curly braces to interpolate an array value within a double-quoted string.
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@kiwisauthorOct 12.2020 — What's the difference here? obviously it's picking up the post variable foo and the square braces allow other parameters to be passed in (who knew!) but the curly ones don't?? - why's that?
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@NogDogOct 12.2020 — The curly braces do a couple things within a double-quoted string if they surround something starting with a $:

  • - They explicitly establish the boundaries of the variable name, useful if whatever immediate follows the variable name is not white-space or other non-word character that cannot be part of a variable name.

  • - Allow array variables within the string to have their indexes quoted. Otherwise you have to leave them unquoted in that situation (e.g. $foo[something] instead of the normal $foo['something']), but that will actually raise a notice-level error about that being a deprecated behavior (I think), but it's weird quoting them in some places and not in others.


    • But, if all that is ugly to you, you can always just use concatenation instead, or even sprintf() or such. These should all do the same thing, assuming no typos by me:
    <i>
    </i>echo "Blah blah {$foo['something']} blah blah" // or...
    echo "Blah blah " . $foo['something'] . " blah blah" // or...
    printf("Blah blah %s blah blah", $foo['something']);
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