How do I remove specific keys from Array? PHP - php

Question

I am trying to remove keys from array.
Here is what i get from printing print_r($cats);
Array
(
[0] => All > Computer errors > HTTP status codes > Internet terminology
[1] =>
Main
)
I am trying to use this to remove "Main" category from the array
function array_cleanup( $array, $todelete )
{
foreach( $array as $key )
{
if ( in_array( $key[ 'Main' ], $todelete ) )
unset( $array[ $key ] );
}
return $array;
}
$newarray = array_cleanup( $cats, array('Main') );
Just FYI I am new to PHP... obviously i see that i made mistakes, but i already tried out many things and they just don't seem to work

Answer 1

Main is not the element of array, its a part of a element of array
function array_cleanup( $array, $todelete )
{
$cloneArray = $array;
foreach( $cloneArray as $key => $value )
{
if (strpos($value, $todelete ) !== false)
unset( $array[ $key ] ); //$array[$key] = str_replace($toDelete, $replaceWith, $value) ; // add one more argument $replaceWith to function
}
return $array;
}
Edit:
with array
function array_cleanup( $array, $todelete )
{
foreach($todelete as $del){
$cloneArray = $array;
foreach( $cloneArray as $key => $value )
{
if (strpos($value, $del ) !== false)
unset( $array[ $key ] ); //$array[$key] = str_replace($toDelete, $replaceWith, $value) ; // add one more argument $replaceWith to function
}
}
return $array;
}
$newarray = array_cleanup( $cats, array('Category:Main') );

Answer 2

Wanted to note that while the accepted answer works there's a built in PHP function that handles this called array_filter. For this particular example it'd be something like:
public function arrayRemoveMain($var){
if ( strpos( $var, "Category:Main" ) !== false ) { return false; }
return true;
}
$newarray = array_filter( $cats, "arrayRemoveMain" );
Obviously there are many ways to do this, and the accepted answer may very well be the most ideal situation especially if there are a large number of $todelete options. With the built in array_filter I'm not aware of a way to pass additional parameters like $todelete so a new function would have to be created for each option.

Answer 3

It's easy.
$times = ['08:00' => '08:00','09:00' => '09:00','10:00' => '10:00'];
$timesReserved = ['08:00'];
$times = (function() use ($times, $timesReserved) {
foreach($timesReserved as $time){
unset($times[$time]);
}
return $times;
})();

Answer 4

The question is "how do I remove specific keys".. So here's an answer with array filter if you're looking to eliminate keys that contain a specific string, in our example if we want to eliminate anything that contains "alt_"
$arr = array(
"alt_1"=>"val",
"alt_2" => "val",
"good key" => "val"
);
function remove_alt($k) {
if(strpos($k, "alt_") !== false) {
# return false if there's an "alt_" (won't pass array_filter)
return false;
} else {
# all good, return true (let it pass array_filter)
return true;
}
}
$new = array_filter($arr,"remove_alt",ARRAY_FILTER_USE_KEY);
# ^ this tells the script to enable the usage of array keys!
This will return
array(""good key" => "val");